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• Delay in playing a beep sound

  - by iSharreth

  -(IBAction)playSound{ AVAudioPlayer *myExampleSound; NSString *myExamplePath = [[NSBundle mainBundle] pathForResource:@"myaudiofile" ofType:@"caf"]; myExampleSound =[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:myExamplePath] error:NULL]; myExampleSound.delegate = self; [myExampleSound play]; } I want to play a beep sound when a button is clicked. I had used the above code. But it is taking some delay in playing the sound. Anyone please help.

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• How Do I Save What I have Drawn In A CGContext

  - by sylvanaar

  I have drawn into a CGContext of a UIView. - (void)drawRect:(CGRect)rect { [self drawInContext:UIGraphicsGetCurrentContext()] } I would like to save what I have drawn to a png file. Is there a simple solution?

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• Callback for camera shutter open event

  - by Raj

  Hi all, I have been working around in UIImagePickerController and am struck with a problem where I need to get the precise moment when the camera shutter opens in UIImagePickerController when the source type is set to camera (UIImagePickerControllerSourceTypeCamera). I have done some googling around and have realized that no one had such strange requirement! I looked around the docs of UIImagePickerController and UIImagePickerControllerDelegate hoping to get some delegate method / callback indicating the camera shutter open event, but did not find any. Any suggestions? Thanks for any help, Raj Pawan

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• iPhone "slide to unlock" animation

  - by Russ

  Any ideas as to how Apple implemented the "slide to unlock" (also, "slide to power off" is another identical example) animation? I thought about some sort of animating mask - but masking is not available on the iPhone OS for performance reasons. Is there some private API effect (like SuckEffect) that they might have used? A spotlight type of effect? Some Core Animation thing? Edit: It's definitely not a series of stills. I've seen examples of being edit a plist value or something and customize the string on jailbroken iphones.

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• iPhone GPS Development - Tips + Tricks

  - by Keith Fitzgerald

  Hello - I'm looking for some feedback, blog links, etc that offer some tips and tricks for iPhone GPS development. I've read and understand the API, I have my demo app up and running, etc but I have run into some "quirks" with gps on iphone. For example, it seems that you you will receive a lot less location updates when your iphone enters "power save" mode. I've read that you can combat this by playing music in your application [not sure if this is true]. It also seems that, terms of making a reasonable pedometer, you should filter out any reading with horizontal accuracies less than 20 meters. Does this sound right? Is there any kind of checklist out on the web for iphone gps gotchas? Thanks in advance.

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• Generating a list of Strings in Obj C

  - by eco_bach

  Hi It seems that Objective C jumps thru hoops to make seemingly simple tasks extremely difficult. I simply need to create a sequence of strings, image1.jpg, image2.jpg, etc etc ie in a loop var imgString:String='image'+i+'.jpg; I assume a best practice is to use a NSMutableString with appendString method? What am I doing wrong?? NSMutableString *imgString; for(int i=1;i<=NUMIMAGES;i++){ imgString.appendString(@"image"+i+@".jpg"); } I get the following error error: request for member 'appendString' in something not a structure or union

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• Finding source of over release

  - by Benedict Lowndes

  Hi, I'm consistently seeing the same message sent in as a crash report from users of an app. It's clear that an object is being over-released but I'm unable to replicate it and I'm looking for tips on tracing the source of it. The relevant section from the crash report shows this: Application Specific Information: objc_msgSend() selector name: release Thread 0 Crashed: Dispatch queue: com.apple.main-thread 0 libobjc.A.dylib 0x90892edb objc_msgSend + 27 1 com.apple.CoreFoundation 0x95ec5a40 __CFBasicHashStandardCallback + 384 2 com.apple.CoreFoundation 0x95ec564e __CFBasicHashDrain + 478 3 com.apple.CoreFoundation 0x95ead6f1 _CFRelease + 353 4 com.apple.CoreFoundation 0x95eda0ed _CFAutoreleasePoolPop + 253 5 com.apple.Foundation 0x97ecedd6 NSPopAutoreleasePool + 76 6 com.apple.Foundation 0x97ececfe -[NSAutoreleasePool drain] + 130 7 com.apple.AppKit 0x9211255f -[NSApplication run] + 1013 8 com.apple.AppKit 0x9210a535 NSApplicationMain + 574 9 TheApp 0x000020a6 start + 54 I've used zombies and leaks, but haven't seen anything there. I've gone through the code and can't see it. What's the next step? Are there any hints I can discern from this information as to the source of it? Does the fact that this nearly exact same crash report is coming in repeatedly mean that it's the same object that's being over released, or because this is referring to the autorelease pool mean it could be any object? Does the reference to _CFRelease mean it's a Core Foundation object that's being over released?

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• NSButton blue highlight

  - by Remizorrr

  Hi. i want to make on/off gradient NSButton but with blue highlight like NSTabView select buttons. Is it possible to make this easy way? Or i should draw this manually? if i should draw this manually what is the best way to do this? (CIFilter or just NSGradient) thanks.

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• OCUnit testing an embedded framework

  - by d11wtq

  I've added a Unit Test target to my Xcode project but it fails to find my framework when it builds, saying: Test.octest could not be loaded because a link error occurred. It is likely that dyld cannot locate a framework framework or library that the the test bundle was linked against, possibly because the framework or library had an incorrect install path at link time. My framework (the main project target) is designed to be embedded and so has an install path of @executable_path/../Frameworks. I've marked the framework as a direct dependency of the test target and I've added it to the "Link Binary with Libraries" build phase. Additionally I've add a first step (after it's built the dependency) of "Copy Files" which simply copies the framework to the unit test bundle's Frameworks directory. Anyone got any experience on this? I'm not sure what I've missed.

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• Aquatic Prime on 10.6?

  - by Kevin

  Hello, I have 2 applications that I use with Aquatic Prime. One is an application just with the Aquatic Prime framework, and the other is an application that I've been working on that has been incorporated with the Aquatic Prime framework. The first application I mentioned before has its SDK set to 10.5 with the architecture to 32-bit. The second application I made has its SDK that is set to 10.6 (which it has to since I need NSRunningApplication) and its architecture to 32-bit. Now my question is, whenever I debug my first application it works perfectly fine, but with my second it gives me this interrupted error right after Running. What's going wrong? I've tried doing some breakpoints like "objc-exception-throw" but all it says is stopped at breakpoint 1. I need 10.6 in my application, but I also need Aquatic Prime. Can anyone help me solve this problem? Ok here's the one from the stack trace which I have no idea how to read: 0x91cdff11 <+0000> push %ebp 0x91cdff12 <+0001> mov %esp,%ebp 0x91cdff14 <+0003> sub $0x28,%esp 0x91cdff17 <+0006> mov %ebx,-0xc(%ebp) 0x91cdff1a <+0009> mov %esi,-0x8(%ebp) 0x91cdff1d <+0012> mov %edi,-0x4(%ebp) 0x91cdff20 <+0015> call 0x91cdff25 <objc_exception_throw+20> 0x91cdff25 <+0020> pop %ebx 0x91cdff26 <+0021> mov 0x8(%ebp),%esi 0x91cdff29 <+0024> lea 0xe4cbb8b(%ebx),%edi 0x91cdff2f <+0030> mov 0x4(%edi),%eax 0x91cdff32 <+0033> test %eax,%eax 0x91cdff34 <+0035> jne 0x91cdff3b <objc_exception_throw+42> 0x91cdff36 <+0037> call 0x91ce4f53 <set_default_handlers> 0x91cdff3b <+0042> mov %esi,(%esp) 0x91cdff3e <+0045> nop 0x91cdff3f <+0046> nopl 0x0(%eax) 0x91cdff43 <+0050> mov %esi,(%esp) 0x91cdff46 <+0053> call *0x4(%edi) 0x91cdff49 <+0056> lea 0xfd44(%ebx),%eax 0x91cdff4f <+0062> mov %eax,(%esp) 0x91cdff52 <+0065> call 0x91ce4e1f <_objc_fatal> The the GDB tells me its all good: run [Switching to process 990] Running… 2009-10-14 15:20:33.233 ApplicationName[990:a0f] init Sincerely, Kevin

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• TTNavigator doesn't use existing navigation bar (iPhone)

  - by user220770

  I am using the three20 framework in one view controller of my App. I create TTNavigator object and open a url which works fine. The problem is that TT creates it's own navigation bar and does not use the existing bar. There is no back button on the new nav bar so I cannot go back to my previous view controller. Has anybody run into this issue? Any ideas on how to fix (besides not using three20)? Thanks

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• Getting a WebView to act exactly like Safari

  - by Kelly McDonald

  (edited to give a better description of the answer I gave) I have created a very simple browser in InterfaceBuilder consisting of a nav bar and a webview. Everything works fine except when I try to tab between input fields is the webview, the focus goes to the nav bar. I'm assuming I need to do something with the responder chain, but I haven't been able to figure out what. Any advice? Thanks, Kelly

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• IPad App Issue - Webview

  - by Manoj Khaylia

  Hi all I developing a Ipad application I am trying to use Webview but not able to open the URL in webview I am using following code NSURL *fileURL = [[[NSURL alloc] initWithString:@"http://www.google.com/"] autorelease]; NSURLRequest *requestObj = [NSURLRequest requestWithURL:fileURL]; [webview loadRequest:requestObj]; this code working well for Iphone app not not working for Ipad app. Is anything wrong. Thanks Amit Battan

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• NSFileCoordinator correct usage

  - by Johannes

  when writing a file using NSFileCoordinator i need to specify to correct NSFileCoordinatorWritingOptions. Although they are explained in detail, i am not sure when to use which one. The available options are: NSFileCoordinatorWritingForDeleting NSFileCoordinatorWritingForReplacing NSFileCoordinatorWritingForMoving NSFileCoordinatorWritingForMerging For example, what option is the correct one if i want to create a file(a plist for example)? Wich one when i modify a file? Can someone explain the NSFileCoordinatorWritingOptions for a better understanding? Greetings, Johannes

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• Set the width and height for a TTLauncherItem

  - by Koning Baard

  I have this: _launcherView.pages = [NSArray arrayWithObjects: [NSArray arrayWithObjects: [[[TTLauncherItem alloc] initWithTitle:@"New Note" image:@"bundle://Icon.png" style:TTSTYL URL:@"http://www.google.com/" canDelete:NO] autorelease], [[[TTLauncherItem alloc] initWithTitle:@"To Do Items" image:@"bundle://Icon.png" URL:@"http://www.yahoo.com/" canDelete:NO] autorelease], nil], nil]; How can I set the width and height for the items? I want all items to be 64x64 pixels. Thanks

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• Cocos2D: Problem Rotating a CCMenu

  - by srikanth rongali

  If I try to do actions over menuItems but the actions are not running as expected. I think code below should make the menuItem rotate by 90 degrees but when I run it, the menuItem translates from its coordinates to another coordinate then returns to its original coordinate. The complete translation takes 3 seconds. What I need is for the menuItem to rotate by 90 degrees in place within a 3 seconds duration. Please explain where I have done wrong? CCMenuItemImage *targetE;//Globally declared CCMenu *menu;//Globally declared -(id)init { if( (self = [super init]) ) { isTouchEnabled = YES; CGSize windowSize = [[CCDirector sharedDirector] winSize]; targetE = [CCMenuItemImage itemFromNormalImage:@"grossinis_sister1.png" selectedImage:@"grossinis_sister1.png" target:self selector:@selector(touch:)]; menu = [CCMenu menuWithItems:targetE,nil]; id action4 = [CCRotateBy actionWithDuration:3.0 angle:90]; [menu runAction: [CCSequence actions: action4, nil]]; menu.position = ccp(windowSize.width/2 + 200, windowSize.height/2); [self addChild: menu z:10]; } return self; } @end Thank You.

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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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• Render data offscreen in UIView

  - by LK

  How would I go about drawing a view offscreen in order to perform some calculation before the view's draw is actually done? Can this be done by drawing to a temporary layer?

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• MVC: Model View Controller -- does the View call the Model?

  - by Gary Green

  I've been reading about MVC design for a while now and it seems officially the View calls objects and methods in the Model, builds and outputs a view. I think this is mainly wrong. The Controller should act and retrieve/update objects inside the Model, select an appropriate View and pass the information to it so it may display. Only crude and rudiementary PHP variables/simple if statements should appear inside the View. If the View gets the information it needs to display from the Model, surely there will be a lot of PHP inside the View -- completely violating the point of seperating presentation logic.

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• Nav Controller, UITableViewController, UITextField to become firstResponder?

  - by Daniel Granger

  I have a core data application which uses a navigation controller to drill down to a detail view and then if you edit one of the rows of data in the detail view you get taken to an Edit View for the that single line, like in Apples CoreDataBooks example! The edit view is a UITableviewController which creates its table with a single section single row and a UITextfield in the cell, programatically. What I want to happen is when you select a row to edit and the edit view is pushed onto the nav stack and the edit view is animated moving across the screen, I want the textfield to be selected as firstResponder so that the keyboard is already showing as the view moves across the screen to take position. Like in the Contacts app or in the CoreDataBooks App. I currently have the following code in my app which causes the view to load and then you see the keyboard appear (which isn't what I want, I want the keyboard to already be there) - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; [theTextField becomeFirstResponder]; } You can't put this in -viewWillAppear as the textfield hasn't been created yet so theTextField is nil. In the CoreDataBooks App where they achieve what i want they load there tableview from a nib so they use the same code but in -viewWillAppear as the textfield has already been created! Is there anyway of getting around this without creating a nib, I want to keep the implementation programatic to enable greater flexibility. Many Thanks

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• Need help with animation on iPhone

  - by Arun Ravindran

  I'm working on an animated clock application for the iPhone, and I have to pivot all the 3 nodes in the view, which I have obtained in the following code: [CATransaction begin]; [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions]; clockarm.layer.anchorPoint = CGPointMake(0.0, 0.0); [CATransaction commit]; [CATransaction begin]; [CATransaction setValue:(id)kCFBooleanFalse forKey:kCATransactionDisableActions]; [CATransaction setValue:[NSNumber numberWithFloat:50.0] forKey:kCATransactionAnimationDuration]; CABasicAnimation *animation; animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; animation.fromValue = [NSNumber numberWithFloat:-60.0]; animation.toValue = [NSNumber numberWithFloat:2 * M_PI]; animation.timingFunction = [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionLinear]; animation.delegate = self; [clockarm.layer addAnimation:animation forKey:@"rotationAnimation"]; animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; [CATransaction commit]; The problem it's just rotating once, ie. only 360 degree and then stopping. I want to raotate the needles indefinitely. How would I do that?

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• Advantages of Thread pooling in embedded systems

  - by Microkernel

  I am looking at the advantages of threadpooling design pattern in Embedded systems. I have listed few advantages, please go through them, comment and please suggest any other possible advantages that I am missing. Scalability in systems like ucos-2 where there is limit on number of threads. Increasing capability of any task when necessary like Garbage collection (say in normal systems if garbage collection is running under one task, its not possible to speed it up, but in threadpooling we can easily speed it up). Can set limit on the max system load. Please suggest if I am missing anything.

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• NSXMLParser and Geonames

  - by Xcoder

  I'm trying to parse a call from Geonames with NSXMLParser in the iPhone SDK. I've used this before but for some reason I'm getting an empty dictionary back even though I get results back in a web browser. Can someone please point out what I may be doing wrong. Below is the code I'm using and the results that comes back pasting it in a browser. Thanks in advance #pragma mark - #pragma mark - Parcer Services -(void)beginLoadingFeed{ //[self startLoadingWithMessage:@"Loading Results...."]; NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(loadFeed) object:nil]; [operationQueue addOperation:operation]; [operation release]; } - (void)loadFeed{ NSString *path = [NSString stringWithFormat:@"http://ws.geonames.org/postalCodeSearch?placename=%@&long&maxRows=20",self.location]; [Logger log:@"Geonames Query: %@",path]; [self parseXMLFileAtURL:path]; [self performSelectorOnMainThread:@selector(didfinishedLoadingFeed) withObject:nil waitUntilDone:YES]; } -(void)didfinishedLoadingFeed{ } - (void)parserDidStartDocument:(NSXMLParser *)parser{ [Logger log:@"found file and started parsing"]; } //Called when the parser runs into an open tag (<tag>) - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict { if ([elementName isEqualToString:@"code"]) { currentResult = [NSMutableDictionary dictionary]; } else { currentElement = [elementName copy]; } } //This is just to resolve random HTML entities - (NSData *)parser:(NSXMLParser *)parser resolveExternalEntityName:(NSString *)entityName systemID:(NSString *)systemID { return [entityName dataUsingEncoding:NSASCIIStringEncoding]; } - (void)parseXMLFileAtURL:(NSString *)URL{ self.results = [[[NSMutableArray alloc] init] autorelease]; NSURL *xmlURL = [NSURL URLWithString:URL]; NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL]; [parser setDelegate:self]; [parser parse]; [parser autorelease]; } - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError { NSString * errorString = [NSString stringWithFormat:@"Unable to connect to web site (Error code %i )", [parseError code]]; [Logger log:@"error parsing : %@", errorString]; [self stopLoadingView]; [self showMessage:@"Error loading content" withTitle:@"Error Loading"]; } /*** Called when the parser runs into a close tag (</tag>). If it is the Result tag that is closing, we should add the currentResult to the array, and then forget about it ***/ - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName { if ([elementName isEqualToString:@"code"]) { [self.results addObject:currentResult]; currentResult = nil; } } - (void)parserDidEndDocument:(NSXMLParser *)parser { [Logger log:@"all done!"]; [Logger log:@"results array has %d items", [self.results count]]; [Logger log:@"Results:%@",results]; [theTableView reloadData]; [self stopLoadingView]; } Below is the result that comes back in a browser using the same call above when doing the search for the term "boston": <?xml version="1.0" encoding="UTF-8" standalone="no"?> <geonames> <totalResultsCount>2808</totalResultsCount> <code> <postalcode>02101</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.370567</lat> <lng>-71.026964</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02108</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.357603</lat> <lng>-71.068432</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02109</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.360027</lat> <lng>-71.054495</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02110</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.357636</lat> <lng>-71.051417</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02111</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.350348</lat> <lng>-71.0629</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02114</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.361111</lat> <lng>-71.06823</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02115</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.342706</lat> <lng>-71.092215</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02116</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.349201</lat> <lng>-71.076798</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02118</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.336162</lat> <lng>-71.072854</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02128</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.364197</lat> <lng>-71.025694</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02199</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.347873</lat> <lng>-71.082543</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02210</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.348921</lat> <lng>-71.046511</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02215</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.347088</lat> <lng>-71.102689</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>22713</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>38.538241</lat> <lng>-78.142285</lng> <adminCode1>VA</adminCode1> <adminName1>Virginia</adminName1> <adminCode2>047</adminCode2> <adminName2>Culpeper</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>24592</postalcode> <name>South Boston</name> <countryCode>US</countryCode> <lat>36.696335</lat> <lng>-78.918829</lng> <adminCode1>VA</adminCode1> <adminName1>Virginia</adminName1> <adminCode2>083</adminCode2> <adminName2>Halifax</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02102</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.338947</lat> <lng>-70.919635</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02103</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.338947</lat> <lng>-70.919635</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02104</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.338947</lat> <lng>-70.919635</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02105</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.338947</lat> <lng>-70.919635</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> <code> <postalcode>02106</postalcode> <name>Boston</name> <countryCode>US</countryCode> <lat>42.354318</lat> <lng>-71.073449</lng> <adminCode1>MA</adminCode1> <adminName1>Massachusetts</adminName1> <adminCode2>025</adminCode2> <adminName2>Suffolk</adminName2> <adminCode3/> <adminName3/> </code> </geonames>

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• Create a screen like the iPhone home screen with Scrollview and Buttons

  - by Anthony Chan

  Hi, I'm working on a project and need to create a screen similar to the iPhone home screen: A scrollview with multiple pages A bunch of icons When not in edit mode, swipe through different pages (even I started the touch on an icon) When not in edit mode, tap an icon to do something When in edit mode, drag the icon to swap places, and even swap to different pages When in edit mode, tap an icon to remove it Previously I read from several forums that I have to subclass UIScrollview in order to have touch input for the UIViews on top of it. So I subclassed it overriding the methods to handle touches: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { //If not dragging, send event to next responder if (!self.dragging) [self.nextResponder touchesBegan:touches withEvent:event]; else [super touchesBegan:touches withEvent:event]; } In general I've override the touchesBegan:, touchesMoved: and touchesEnded: methods similarly. Then in the view controller, I added to following code: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; UIView *hitView = (UIView *)touch.view; if ([hitView isKindOfClass:[UIView class]]) { [hitView doSomething]; NSLog(@"touchesBegan"); } } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { // Some codes to move the icons NSLog(@"touchesMoved"); } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"touchesEnded"); } When I run the app, I have the touchesBegan method detected correctly. However, when I tried to drag the icon, the icon just moved a tiny bit and then the page started to scroll. In console, it logged with 2 or 3 "touchesMoved" message only. However, I learned from another project that it should logged tonnes of "touchesMoved" message as long as I'm still dragging on the screen. (I'm suspecting I have the delaysContentTouches set to YES, so it delays a little bit when I tried to drag the icons. After that minor delay, it sends to signal back to the scrollview to scroll through the page. Please correct me if I'm wrong.) So if any help on the code to perform the above tasks would be greatly appreciated. I've stuck in this place for nearly a week with no hope. Thanks a lot.

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• Asynchronous NSURLConnection Throws EXC_BAD_ACCESS

  - by Sheehan Alam

  I'm not really sure why my code is throwing a EXC_BAD_ACCESS, I have followed the guidelines in Apple's documentation: -(void)getMessages:(NSString*)stream{ NSString* myURL = [NSString stringWithFormat:@"http://www.someurl.com"]; NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:myURL]]; NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self]; if (theConnection) { receivedData = [[NSMutableData data] retain]; } else { NSLog(@"Connection Failed!"); } } And my delegate methods #pragma mark NSURLConnection Delegate Methods - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { // This method is called when the server has determined that it // has enough information to create the NSURLResponse. // It can be called multiple times, for example in the case of a // redirect, so each time we reset the data. // receivedData is an instance variable declared elsewhere. [receivedData setLength:0]; } - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { // Append the new data to receivedData. // receivedData is an instance variable declared elsewhere. [receivedData appendData:data]; } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { // release the connection, and the data object [connection release]; // receivedData is declared as a method instance elsewhere [receivedData release]; // inform the user NSLog(@"Connection failed! Error - %@ %@", [error localizedDescription], [[error userInfo] objectForKey:NSErrorFailingURLStringKey]); } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { // do something with the data // receivedData is declared as a method instance elsewhere NSLog(@"Succeeded! Received %d bytes of data",[receivedData length]); // release the connection, and the data object [connection release]; [receivedData release]; } I get an EXC_BAD_ACCESS on didReceiveData. Even if that method simply contains an NSLog, I get the error. Note: receivedData is an NSMutableData* in my header file

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