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• How Can i reload data in tableview in view controller in iphone

  - by Pugal Devan

  Hi, I am new to iphone development. I have created 5 buttons in the view. On clicking the buttons it navigates to the corresponding views. On clicking the "News" button it navigates and displayed the parsing details in the table view.(This table view, I have created View controller and added table view using Interface Builder and i have set all the properties.) and i go to another button and comes back to the "News" button, every time parsing will happened.How to avoid the multiple parsing when i come back to the button. i have tried this one and my code is, - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; static int i; if(i == 0) { NSString * path = @"http://www.AAAAAAAAAAAAAAAA.com"; [self parseXMLFileAtURL:path]; i++; } [self.newsTable reloadData]; } } Now the parsing is happened only time but the datas are doesnt displayed. My problem is the tableview doesnot reload. newsTable is the instance of the Tableview. How can i achieve this. Please help me out. Thanks.

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• IPhone SDK - Transition to NavigationController display problem

  - by Steblo

  Hi, I am nearly finished with my first IPhone app and everything works fine - except of one very little display bug: My starscreen is an UIView (Fullscreen) without Navigationbar or Toolbar. If I tap on a start button, there is an UIViewAnimationTransitionFlipFromRight animation that flips to the main navigation controller: -(IBAction) switchViewToMainMenu { [UIView beginAnimations:@"Flip View" context:nil]; [UIView setAnimationDuration:1.25]; [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; [UIView setAnimationTransition: UIViewAnimationTransitionFlipFromRight forView:self.window cache:YES]; [self.navController viewWillAppear:YES]; [self.startScreenViewController viewWillDisappear:YES]; [self.startScreenViewController.view removeFromSuperview]; [self.window addSubview:navController.view]; [self.startScreenViewController viewDidDisappear:YES]; [self.navController viewDidAppear:YES]; [UIView commitAnimations]; self.startScreenViewController=nil; [startScreenViewController release]; } This works fine except of one little problem: When the navigation controller view appears (flips in), the Navigationbar on top is some pixels too high (the is a white bar where the Navigationbar should be). When the animation finished, the Navigationbar drops down to the right position. This doesn't look very beautiful... Any ideas how to fix that problem ?

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• Building ARM assembler vorbis decoder lib 'Tremolo' for iPhone

  - by Joachim Bengtsson

  I'm trying to compile Tremolo for iPhone. I've pulled in the files bitwise.c bitwiseARM.s codebook.c dpen.s dsp.c floor0.c floor1.c floor1ARM.s floor_lookup.c framing.c info.c mapping0.c mdct.c mdctARM.s misc.c res012.c into a new target, added the following custom settings: GCC_PREPROCESSOR_DEFINITIONS = _ARM_ASSEM_ GCC_C_LANGUAGE_STANDARD = gnu99 GCC_THUMB_SUPPORT = YES ... but as soon as xcode reaches the first assembler file, bitwiseARM.s, I get errors like these: /tremolo/bitwiseARM.s:3:Unknown pseudo-op: .global /tremolo/bitwiseARM.s:3:Rest of line ignored. 1st junk character valued 111 (o). /tremolo/bitwiseARM.s:4:Unknown pseudo-op: .global /tremolo/bitwiseARM.s:4:Rest of line ignored. 1st junk character valued 111 (o). /tremolo/bitwiseARM.s:5:Unknown pseudo-op: .global /tremolo/bitwiseARM.s:5:Rest of line ignored. 1st junk character valued 111 (o). /tremolo/bitwiseARM.s:6:Unknown pseudo-op: .global /tremolo/bitwiseARM.s:6:Rest of line ignored. 1st junk character valued 111 (o). /tremolo/bitwiseARM.s:11:bad instruction `STMFD r13!,{r10,r11,r14}' /tremolo/bitwiseARM.s:12:bad instruction `LDMIA r0,{r2,r3,r12}' /tremolo/bitwiseARM.s:16:bad instruction `SUBS r2,r2,r1' /tremolo/bitwiseARM.s:17:bad instruction `BLT look_slow' /tremolo/bitwiseARM.s:19:bad instruction `LDR r10,[r3]' The first error I could google, and changing .global to .globl fixed the first errors, but I still get the bad instructions, and I don't get why. Googling for the ARM instruction set, the above instructions look valid to me. I've tried toggling thumb support, and building for just armv7 instead of armv6, but neither helped.

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• iPhone: Fastest way to create a binary Plist with simple key/value strings

  - by randombits

  What's the best way to create a binary plist on the iPhone with simple string based key/value pairs? I need to create a plist with a list of recipe and ingredients. I then want to be able to read this into an NSDictionary so I can do something like NSString *ingredients = [recipes objectForKey:@"apple pie"]; I'm reading in an XML data file through an HTTP request and want to parse all of the key value pairs into the plist. The XML might look something like: <recipes> <recipe> <name>apple pie</name> <ingredients>apples and pie</ingredients> </recipe> <recipe> <name>cereal</name> <ingredients>milk and some other ingredients</ingredients> </recipe> </recipes> Ideally, I'll be able to write this to a plist at runtime, and then be able to read it and turn it into an NSDictionary later at runtime as well.

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• iPhone JSON object releasing itself?

  - by MidnightLightning

  I'm using the JSON Framework addon for iPhone's Objective-C to catch a JSON object that's an array of Dictionary-style objects via HTTP. Here's my connectionDidFinishLoading function: - (void)connectionDidFinishLoading:(NSURLConnection *)connection { [connection release]; NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; [loadingIndicator stopAnimating]; NSArray *responseArray = [responseString JSONValue]; // Grab the JSON array of dictionaries NSLog(@"Response Array: %@", responseArray); if ([responseArray respondsToSelector:@selector(count)]) { NSLog(@"Returned %@ items", [responseArray count]); } [responseArray release]; [responseString release]; } The issue is that the code is throwing a EXC_BAD_ACCESS error on the second NSLog line. The EXC_BAD_ACCESS error I think indicates that the variable got released from memory, but the first NSLog command works just fine (and shows that the data is all there); it seems that only when calling the count message is causing the error, but the respondsToSelector call at least thinks that the responseArray should be able to respond to that message. When running with the debugger, it crashes on that second line, but the stack shows that the responseArray object is still defined, and has 12 objects in it (so the debugger at least is able to get an accurate count of the contents of that variable). Is this a problem with the JSON framework's creation of that NSArray, or is there something wrong with my code?

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• compiling iphone program in snow leopard wtih libsqlite3 library

  - by user360297

  Hi, I develop an iphone application which uses sqlite3 as a database. That time my OS X version was leopard. So add added libsqlite3.0.dylib to frameworks and compile without any problems it complied and with any problems I could run it on the device as well. This week I installed Snow Leopard on my Mac. Removing old Leopard version and install a fresh Snow leopard system. But my problem is now I cannot compile that program because it will give errors with sqlite3 library. I added sqlite3.0.dylib using selecting targets and then selecting file. Also tried adding selecting it from directly /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.3.sdk/usr/lib I get two different errors when I compiled to device and to simulator when compiled to device, ld: warning: in /opt/local/lib/libsqlite3.0.dylib, file is not of required architecture* When compiled to simulator, ld: warning: in /opt/local/lib/libsqlite3.0.dylib, file was built for unsupported file format which is not the architecture being linked (i386) ld: warning: in /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.3.sdk/usr/lib/libSystem.dylib, missing required architecture i386 in file ld: in /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.3.sdk/usr/lib/libobjc.A.dylib, missing required architecture i386 in file Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1 i also tried with adding sqlite3.dylib (, I think sqlite3.0.dylib is linked to sqlite3.dylib.) but no luck. Could any one out there give me any help. I'm really trying to get this working. Please let me if you want more details. Thank you, Waruna

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• Sending hidden fields via POST in iPhone in-app email

  - by Michael

  I'm letting my App's user send email from within the app to share some content on myserver. To do so I need to include a button with two bits of data and I want to use POST to keep it somewhat hidden. I've decided to add an html form using POST and two hidden fields in the email rather, like so: NSString *buttonCode = [NSString stringWithFormat:@"<form method='post' action='http://www.example.com/iphone/nifty.php'> <input type='hidden' name='dataOne' value='%@'> <input type='hidden' name='dataTwo' value='%@'> <input type='submit'value='Submit'></form>",dataOne, dataTwo]; NSString *emailBody = [NSString stringWithFormat: @"<b>%@ - %@</b>\n\n<HR WIDTH=200 SIZE=2 COLOR=#755f0f ALIGN=CENTER>\n Here is a email:<br><br>%@", dateString, timeString, buttonCode]; [picker setMessageBody:emailBody isHTML:YES]; I've confirmed by looking at the raw source of the email that the form is constructed correctly and I've copied and pasted it into a web page and it works. So here is the problem. When I click on the button in the received email (using apple's mail client) the dataOne and dataTwo variables don't get passed to my server. Is there a better way to do this or is the issue with my mail client?

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• iPhone - UIImage imageScaledToSize Memory Issue

  - by bbullis21

  I have done research and tried several times to release the UIImage memory and have been unsuccessful. I saw one other post on the internet where someone else was having this same issue. Everytime imageScaledToSize is called, the ObjectAlloc continues to climb. In the following code I am pulling a local image from my resource directory and resizing it with some blur. Can someone provide some help on how to release the memory of the UIImages called....scaledImage and labelImage. This is the chunk of code where the iPhone Intruments has shown to have the ObjectAlloc build up. This chunk of code is called several times with an NSTimer. //Get local image from inside resource NSString * fileLocation = [[NSBundle mainBundle] pathForResource:imgMain ofType:@"jpg"]; NSData * imageData = [NSData dataWithContentsOfFile:fileLocation]; UIImage * blurMe = [UIImage imageWithData:imageData]; //Resize and blur image UIImage * scaledImage = [blurMe _imageScaledToSize:CGSizeMake(blurMe.size.width / dblBlurLevel, blurMe.size.width / dblBlurLevel) interpolationQuality:3.0]; UIImage * labelImage = [scaledImage _imageScaledToSize:blurMe.size interpolationQuality:3.0]; imgView.image = labelImage;

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• iPhone - dequeueReusableCellWithIdentifier usage

  - by Jukurrpa

  Hi, I'm working on a iPhone app which has a pretty large UITableView with data taken from the web, so I'm trying to optimize its creation and usage. I found out that dequeueReusableCellWithIdentifier is pretty useful, but after seeing many source codes using this, I'm wondering if the usage I make of this function is the good one. Here is what people usually do: UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"]; if (cell == nil) { cell = [[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:@"Cell"]; // Add elements to the cell return cell; And here is the way I did it: NSString identifier = [NSString stringWithFormat:@"Cell @d", indexPath.row]: // The cell row UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:identifier]; if (cell != nil) return cell; cell = [[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:identifier]; // Add elements to the cell return cell; The difference is that people use the same identifier for every cell, so dequeuing one only avoids to alloc a new one. For me, the point of queuing was to give each cell a unique identifier, so when the app asks for a cell it already displayed, neither allocation nor element adding have to be done. In fine I don't know which is best, the "common" method ceils the table's memory usage to the exact number of cells it display, whislt the method I use seems to favor speed as it keeps all calculated cells, but can cause large memory consumption (unless there's an inner limit to the queue). Am I wrong to use it this way? Or is it just up to the developper, depending on his needs?

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• how to handle base tag target attribute in iphone uiwebview to open new window

  - by user217428

  When the links are supposed to open a new window, iphone uiwebview won't trigger an event when user click these links. We had to use javascript to do some trick to the target attribute of the links. I can handle 'a' tag to open in the '_self' window with the trick without problem. But when I do it the same way with the 'base' tag. it doesn't work. I believe the base target is set by the javascript. But the base tag is in the head, which may be handled by the uiwebview before my javascript executed, so the target change may not reflected in the webkit engine. Could someone please give some suggestion, so I can open the link in the same uiwebview? The following is the sample HTML opened in the uiwebview <html> <head> <base target='_blank'> </head> <body> <a href='http://google.ca'>google</a> </body> </html> The following is the code to be executed in the (void) webViewDidFinishLoad: (UIWebView*)webView static NSString* js = @"" "function bkModifyBaseTargets()" "{" "var allBases = window.document.getElementsByTagName('base');" "if (allBases)" "{" "for (var i = 0; i < allBases.length; i++)" "{" "base = allBases[i];" "target = base.getAttribute('target');" "if (target)" "{" "base.setAttribute('target', '_self');" "}" "}" "}" "}"; [webView stringByEvaluatingJavaScriptFromString: js]; [webView stringByEvaluatingJavaScriptFromString: @"bkModifyBaseTargets()"];

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• Read large file into sqlite table in objective-C on iPhone

  - by James Testa

  I have a 2 MB file, not too large, that I'd like to put into an sqlite database so that I can search it. There are about 30K entries that are in CSV format, with six fields per line. My understanding is that sqlite on the iPhone can handle a database of this size. I have taken a few approaches but they have all been slow 30 s. I've tried: 1) Using C code to read the file and parse the fields into arrays. 2) Using the following Objective-C code to parse the file and put it into directly into the sqlite database: NSString *file_text = [NSString stringWithContentsOfFile: filePath usedEncoding: NULL error: NULL]; NSArray *lineArray = [file_text componentsSeparatedByString:@"\n"]; for(int k = 0; k < [lineArray count]; k++){ NSArray *parts = [[lineArray objectAtIndex:k] componentsSeparatedByString: @","]; NSString *field0 = [parts objectAtIndex:0]; NSString *field2 = [parts objectAtIndex:2]; NSString *field3 = [parts objectAtIndex:3]; NSString *loadSQLi = [[NSString alloc] initWithFormat: @"INSERT INTO TABLE (TABLE, FIELD0, FIELD2, FIELD3) VALUES ('%@', '%@', '%@');",field0, field2, field3]; if (sqlite3_exec (db_table, [loadSQLi UTF8String], NULL, NULL, &errorMsg) != SQLITE_OK) { sqlite3_close(db_table); NSAssert1(0, @"Error loading table: %s", errorMsg); } Am I missing something? Does anyone know of a fast way to get the file into a database? Or is it possible to translate the file into a sqlite format that can be read directly into sqlite? Or should I turn the file into a plist and load it into a Dictionary? Unfortunately I need to search on two of the fields, and I think a Dictionary can only have one key? Jim

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• iPhone - User Defaults and UIImages

  - by Staros

  Hello, I've been developing an iPhone app for the last few months. Recently I wanted to up performance and cache a few of the images that are used in the UI. The images are downloaded randomly from the web by the user so I can't add specific images to the project. I'm also already using NSUserDefaults to save other info within the app. So now I'm attempting to save a dictionary of UIImages to my NSUserDefaults object and get... -[UIImage encodeWithCoder:]: unrecognized selector sent to instance I then decided to subclass UIImage with a class named UISaveableImage and implement NSCoding. So now I'm at... @implementation UISaveableImage -(void)encodeWithCoder:(NSCoder *)encoder { [encoder encodeObject:super forKey:@"image"]; } -(id)initWithCoder:(NSCoder *)decoder { if (self=[super init]){ super = [decoder decodeObjectForKey:@"image"]; } return self; } @end which isn't any better than where I started. If I was able to convert an UIImage to NSData I would be good, but all I can find are function like UIImagePNGRepresentation which require me to know what type of image this was. Something that UIImage doesn't allow me to do. Thoughts? I feel like I might have wandered down the wrong path...

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• iPhone app: How to implement in-app purchased game levels

  - by Wonderflonium

  So, I understand that it's possible to set up in-app purchases for iPhone apps to purchase non-consumables like game levels. I understand the logic behind the purchase part, but what I don't understand is, how can I deliver the new game level. For example: I build an app that contains the first level and they purchase additional levels. Is it better to build all the other levels into the app and whenever they purchase the app, it unlocks it with a plist entry or something? That doesn't seem very update-able to me. Every time I come up with a new level, I'd have to update the app. So, what I don't understand then, is what is how do I package up a level and download it as a separate entity that can accessed by the game? Would the level just be some XML with images in a ZIP folder or something? How does the level get added to the game? What are best practices for this type of thing? I Googled and have found NOTHING about this. I'm a little bit confused by the concept and any help would be appreciated. I'm not looking for someone to write the game for me, I just need pointed in the right direction so I can develop it on my own.

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• Facebook Connect iPhone API logout not working

  - by Hunter Bridges

  I am attempting to write a Facebook integration in an iPhone app I'm working on. I have it logging in just fine, but I don't like the idea of being able to turn a feature on without being able to turn it off. So, in working on the logout functionality, I have been caught in a snag. - (IBAction) logoutClicked:(id)sender { if (fbLoggedIn) { FBSession * mySession = [FBSession session]; [mySession logout]; } } - (void)sessionDidLogout:(FBSession*)session { NSLog(@"Session logged out."); [theLoginButton setTitle:@"Facebook Time!" forState:UIControlStateNormal]; fbLoggedIn = FALSE; theLogoutButton.enabled = NO; theLogoutButton.alpha = 0; } The logoutClicked method responds to a button in my xib. The delegate method is not getting called. I have tried setting the Facebook session as a property in my ViewController in order to store/access the data across methods, but that didn't seem to work either. Anybody have any solutions?

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• Integrating twitpic OAuth for iPhone.

  - by asadqamber

  How can I integrate twitpic API with OAuth for posting an image from iPhone? Any help or tutorial? Currently I am doing... NSURL *twitpicURL = [NSURL URLWithString:@"http://api.twitpic.com/2/upload.format"]; theRequest = [NSMutableURLRequest requestWithURL:twitpicURL]; [theRequest setHTTPMethod:@"POST"]; // Set the params NSString *message = theMessage; [theRequest addValue:@"http://api.twitter.com/" forHTTPHeaderField:@"OAuth realm"]; [theRequest addValue:TWITPIC_API_KEY forHTTPHeaderField:@"oauth_consumer_key"]; [theRequest addValue:@"HMAC-SHA1" forHTTPHeaderField:@"oauth_signature_method"]; [theRequest addValue:USER_OAUTH_TOKEN forHTTPHeaderField:@"oauth_token"]; [theRequest addValue:USER_OAUTH_SECRET forHTTPHeaderField:@"oauth_secret"]; [theRequest addValue: @"1272325550" forHTTPHeaderField:@"oauth_timestamp"]; [theRequest addValue:nil forHTTPHeaderField:@"oauth_nonce"]; [theRequest addValue:@"1.0" forHTTPHeaderField:@"oauth_version"]; [theRequest addValue:nil forHTTPHeaderField:@"oauth_signature"]; NSMutableData *postBody = [NSMutableData data]; [postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"source\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithFormat:@"lighttable"] dataUsingEncoding:NSUTF8StringEncoding]]; // Message [postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"message\"\r\n\r\n%@", message]dataUsingEncoding:NSUTF8StringEncoding]]; // Media [postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"media\"; filename=\"%@\"\r\n", @"doc_twitpic_image.jpg"] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithFormat:@"Content-Type: image/jpg\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; // data as JPEG [postBody appendData:[[NSString stringWithFormat:@"Content-Transfer-Encoding: binary\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[NSData dataWithData:image]]; [theRequest setHTTPBody:postBody]; [theRequest setValue:[NSString stringWithFormat:@"%d", [postBody length]] forHTTPHeaderField:@"Content-Length"]; theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

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• Ability to draw and record a signature as part of a form - iphone

  - by mustic

  Apolgies in advance for any errors.. new to this and am not a developer/programmer.. just have some basic unix experience. I have searched the web and struggled to find a solution to my problem when I stumbled onto this website which maybe suggested that there is a solution to my question. For work i use a windows mobile device because we have to get customers to sign and form after a customer visit. the signature being very important. On the windows device i use the notes application and am able to record details and obtain/record (using draw) a customer signature. the form is then emailed back to HQ. The format being used is a *.pwi I have downloaded and paid for several applications for my iphone which is my preferred device and cant quite find anything that does both. the critical bit here is to be able to take a signature on the phone, save the doc in a format such as .txt, .doc or .pdf where i can control the file name then be able to email back to HQ. Am i asking too much? I hope that makes sense.. Any help would be much appreciated many thanks in advance

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• glitchy stuttery iphone game loop

  - by Adam

  This is a problem I've been trying to solve for a few days now, and I've looked at the various solutions on stackoverflow and nothing has really seemed to work for me. I'm making an iPhone game with OpenGLES graphics and accelerometer input, at this point it's very simple, but the rendering is already pretty bad... it stutters and seems to jump back or forward in time. It doesn't happen a lot, but it happens enough to be a problem. I mean, who wants to play a game where a bullet gets magically transported into the player, and then it's game over? No one. I've tried using NSTimer for the game loop, I've tried using a separate thread (with a frame rate and continuously) I've tried using different frame rates, from 30FPS to 60FPS (It seems to have a max frame rate around 45FPS, but no problems at 30FPS) I've tried using timeIntervalSince1970 and CFGetAbsoluteTime to measure loop time, with no noticeable diffence Anyone have any ideas on what is the best way to get this looking better? One of the posts I've read suggested running the simulation at a fixed frame rate and then just render as fast as possible, does that seem like a good idea?

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• Touch coordinates in iPhone landscape mode app

  - by gok

  I am trying to make this landscape only iphone app. I only use this code for this purpose: - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationLandscapeRight); } However when I click clip subviews checkbox from interface builder, the view is clipped from the middle. I also don't receive any touch events from outside of view bounds obviously. - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { CGPoint fingerPos = [[touches anyObject] locationInView:self.view]; NSLog(@"%f %f",fingerPos.x,fingerPos.y); } only prints for coordinates between 20 and 320 for X. But Y works fine. When i try to modify bounds by hand, everything works fine; View is positioned and shown correctly, printed coordinates are correct, I receive touch from all of the screen except between 0 and 20 for X. So Left side of the screen is unresponsive to touch events for only 20 pixels. Code I use to modify bounds: self.view.bounds = CGRectMake(-180.0f, 0.0f, 680.0f, 480.0f); What might be causing this? Weird!

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• Symbolicate adhoc iphone app crashes.

  - by gotye

  Hey everyone, I can't manage to make my code symbolicated ... I read the part "below" : Given a crash report, the matching binary, and its .dSYM file, symbolication is relatively easy. The Xcode Organizer window has a tab for crash reports of the currently selected device. You can view externally received crash reports in this tab - just place them in the appropriate directory. This is the same as the Mac OS X directory described in the first section. It doesn't matter which device you have tethered, but the directory in which you place the crash report must be the directory for the tethered and selected device. It is not necessary to place the binary and .dSYM file in any particular location. Xcode uses Spotlight and the UUID to locate the correct files. It is necessary, though, that both files be in the same directory and that this directory is one that is indexed by Spotlight. Anywhere in your home directory should be fine. But it doesn't work for me ... here is what I did : I opened xcode organizer and I had my iphone device with crash logs App and dsym files are in my xcode project which is on my desktop All the rest should be automatic, right ? but crash logs aren't symbolicated yet ... Any comments welcome. Cheers. Gotye.

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• iPhone app crashes on start-up, in stack-trace only messages from built-in frameworks

  - by Aleksejs

  My app some times crashes at start-up. In stack-trace only messages from built-in frameworks. An excerpt from a crash log: OS Version: iPhone OS 3.1.3 (7E18) Report Version: 104 Exception Type: EXC_BAD_ACCESS (SIGBUS) Exception Codes: KERN_PROTECTION_FAILURE at 0x000e6000 Crashed Thread: 0 Thread 0 Crashed: 0 CoreGraphics 0x339305d8 argb32_image_mark_RGB32 + 704 1 CoreGraphics 0x338dbcd4 argb32_image + 1640 2 libRIP.A.dylib 0x320d99f0 ripl_Mark 3 libRIP.A.dylib 0x320db3ac ripl_BltImage 4 libRIP.A.dylib 0x320cc2a0 ripc_RenderImage 5 libRIP.A.dylib 0x320d5238 ripc_DrawImage 6 CoreGraphics 0x338d7da4 CGContextDelegateDrawImage + 80 7 CoreGraphics 0x338d7d14 CGContextDrawImage + 364 8 UIKit 0x324ee68c compositeCGImageRefInRect 9 UIKit 0x324ee564 -[UIImage(UIImageDeprecated) compositeToRect:fromRect:operation:fraction:] 10 UIKit 0x32556f44 -[UINavigationBar drawBackButtonBackgroundInRect:withStyle:pressed:] 11 UIKit 0x32556b00 -[UINavigationItemButtonView drawRect:] 12 UIKit 0x324ecbc4 -[UIView(CALayerDelegate) drawLayer:inContext:] 13 QuartzCore 0x311cacfc -[CALayer drawInContext:] 14 QuartzCore 0x311cab00 backing_callback 15 QuartzCore 0x311ca388 CABackingStoreUpdate 16 QuartzCore 0x311c978c -[CALayer _display] 17 QuartzCore 0x311c941c -[CALayer display] 18 QuartzCore 0x311c9368 CALayerDisplayIfNeeded 19 QuartzCore 0x311c8848 CA::Context::commit_transaction(CA::Transaction*) 20 QuartzCore 0x311c846c CA::Transaction::commit() 21 QuartzCore 0x311c8318 +[CATransaction flush] 22 UIKit 0x324f5e94 -[UIApplication _reportAppLaunchFinished] 23 UIKit 0x324a7a80 -[UIApplication _runWithURL:sourceBundleID:] 24 UIKit 0x324f8df8 -[UIApplication handleEvent:withNewEvent:] 25 UIKit 0x324f8634 -[UIApplication sendEvent:] 26 UIKit 0x324f808c _UIApplicationHandleEvent 27 GraphicsServices 0x335067dc PurpleEventCallback 28 CoreFoundation 0x323f5524 CFRunLoopRunSpecific 29 CoreFoundation 0x323f4c18 CFRunLoopRunInMode 30 UIKit 0x324a6c00 -[UIApplication _run] 31 UIKit 0x324a5228 UIApplicationMain 32 Journaler 0x000029ac main (main.m:14) 33 Journaler 0x00002948 start + 44 File main.m is simple as possible: #import <UIKit/UIKit.h> int main(int argc, char *argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; int retVal = UIApplicationMain(argc, argv, nil, nil); // line 14 [pool release]; return retVal; } What my cause the app to crash?

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• iphone webview dynamic font support

  - by Kiran

  Friends, I am trying to build a simple iphone application to view a local webpage that uses dynamic fonts. The url is www.eenadu.net. I have just a single view based application and inserted a webview into the view and implementing the webviewdelegate in viewcontroller. The site uses ttf/eot fonts that are dynamically downloadable by browser from http://www.eenadu.net/eenadu.ttf or http://www.eenadu.net/EENADU0.eot. Here is what I am doing in the code by doing some research: Code: ( void ) loadFont { NSString *fontPath = [[NSBundle mainBundle] pathForResource:@"eenadu" ofType:@"ttf"]; CGDataProviderRef fontDataProvider = CGDataProviderCreateWithFilename([fontPath UTF8String]); // Create the font with the data provider, then release the data provider. customFont = CGFontCreateWithDataProvider(fontDataProvider); CGDataProviderRelease(fontDataProvider); fontPath = [[NSBundle mainBundle] pathForResource:@"eenadu" ofType:@"eot"]; fontDataProvider = CGDataProviderCreateWithFilename([fontPath UTF8String]); // Create the font with the data provider, then release the data provider. customFont = CGFontCreateWithDataProvider(fontDataProvider); CGDataProviderRelease(fontDataProvider); } (void) viewDidLoad { [super viewDidLoad]; [self loadFont]; [webView setBackgroundColor:[UIColor whiteColor]]; NSString *urlAddress = @"http://www.eenadu.net/"; NSURL *url = [NSURL URLWithString:urlAddress]; NSURLRequest *requestObj = [NSURLRequest requestWithURL:url]; [webView loadRequest:requestObj]; } I see that the page loads however doesn't display the font. Please help. Also, For loadFont, I have included the fonts in the build with right names and took care of the case as well.

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• iPhone programming - problem with CoreFoundation forking

  - by Tom

  Hello all, I've been working on an iPhone for several months. It's a 2d shooting game akin to the old Smash TV type games. I'm doing everything alone and it has come out well so far, but now I am getting unpredictable crashes which seem to be related to CoreFoundation forking and not exec()ing, as the message __THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONA LITY___YOU_MUST_EXEC__ always shows up somewhere in the debugger. Usually it shows up around a CFRunLoopRunSpecific and is related to either a timer firing or _InitializeTouchTapCount. I cannot figure out exactly what is causing the fork to occur. My main game loop is running on a timer, first updating all the logic and then drawing everything with openGL. There is nothing highly complex or unusual. I understand you cannot make CF calls on the childside of a fork, or access shared memory and things like that. I am not explicitly trying to fork anything. My question is: can anyone tell me what type of activity might cause CoreFoundation to randomly fork like this? I'd really like to finish this game and I don't know how to solve this problem. Thanks for any help.

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• SQLite on iPhone - Techniques for tracking down multithreading-related bugs

  - by Jasarien

  Hey guys, I'm working with an Objective-C wrapper around SQLite that I didn't write, and documentation is sparse... It's not FMDB. The people writing this wrapper weren't aware of FMDB when writing this code. It seems that the code is suffering from a bug where database connections are being accessed from multiple threads -- which according to the SQLite documentation won't work if the if SQLite is compiled with SQLITE_THREADSAFE 2. I have tested the libsqlite3.dylib provided as part of the iPhone SDK and seen that it is compiled in this manner, using the sqlite_threadsafe() routine. Using the provided sqlite library, the code regularly hits SQLITE_BUSY and SQLITE_LOCKED return codes when performing routines. To combat this, I added some code to wait a couple of milliseconds and try again, with a maximum retry count of 50. The code didn't contain any retry logic prior to this. Now when a sqlite call returns SQLITE_BUSY or SQLITE_LOCKED, the retry loop is invoked and the retry returns SQLITE_MISUSE. Not good. Grasping at straws, I replaced the provided sqlite library with a version compiled by myself setting SQLITE_THREADSAFE to 1 - which according to the documentation means sqlite is safe to be used in a multithreaded environment, effectively serialising all of the operations. It incurs a performance hit, that which I haven't measured, but it ridded the app of the SQLITE_MISUSE happening and seemed to not need the retry logic as it never hit a busy or locked state. What I would rather do is fix the problem of accessing a single db connection from multiple threads, but I can't for the life of me find where it's occurring. So if anyone has any tips on locating multithreaded bugs I would be extremely appreciative. Thanks in advance.

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• iPhone multitouch - Some touches dispatch touchesBegan: but not touchesMoved:

  - by zkarcher

  I'm developing a multitouch application. One touch is expected to move, and I need to track its position. For all other touches, I need to track their beginnings and endings, but their movement is less critical. Sometimes, when 3 or more touches are active, my UIView does not receive touchesMoved: events for the moving touch. This problem is intermittent, and can always be reproduced after a few attempts: Touch the screen with 2 fingers. Touch the screen with another finger, and move this finger around. The moving finger always dispatches touchesBegan: and touchesEnded:, but sometimes does not dispatch any touchesMoved: events. Whenever the moving touch does not dispatch touchesMoved: events, I can force it to dispatch touchesMoved: if I move one of the other touches. This seems to "force" every touch to recheck its position, and I successfully receive a touchesMoved: event. However, this is clumsy. This bug is reproducible on both the iPhone 2G and 3GS models. My question is: How do I ensure that my moving touch dispatches touchesMoved: events? Does anyone have any experience with this issue? I've spent few fruitless days searching the web for answers. I found a post describing how to sync touch events with the VBL: http://www.71squared.com/2009/04/maingameloop-changes/ . However, this has not solved the problem. I really don't know how to proceed. Any help is appreciated!

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• trackPageView on Google Analytics for iPhone Not Working

  - by DigitalZombieKid

  I'm trying to get Google Analytics working on an iPhone application without much luck. I've followed all the instructions on their website (google/apis/analytics/docs/tracking/mobileAppsTracking.html) and studied their sample application (google/gaformobileapps/GoogleAnalyticsIphone_0.7.tar.gz). When I run my application and go to Google Analytics' website (https://www.google.com/analytics/reporting/), the only page that is recording is /app_entry_point. I'm seeing one count in my Google Analytics detailed report once every time my app fires up. However, I have added other pages to be tracked but it's not working. Here is a sample of two pages I've added to be tracked: trackPageview:@"/calculator"; trackPageview:@"/tellafriend"; I call them from various ViewControllers in the app. In each of those view controllers I import the the GANTracker header: #import "GANTracker.h" I'll admit it: I'm an objective-c newbie. Any help you can offer is greatly appreciated! Do I need to physically dispatch them to get the trackPageview working? If so, why is the /app_entry_point page the only page that is recorded by Google Analytics?

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