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  • Optimizing UITableView

    - by Daniel Granger
    I have a UITableview made up with a custom cell loaded from a nib. This custom cell has 9 UILabel s and thats all. When scrolling the table on my iPhone the tables scrolling motion is slightly jerky, its not as smooth as other tableviews! (On the simulator it scrolls fine but I guess its using the extra power of my mac) Are there any tips to help optimize this or any tableview or methods to help find the bottleneck. Many Thanks

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  • UIViewController rotate methods

    - by Corey Floyd
    What object is responsible for dipatching the UIViewController rotation method calls, i.e: – shouldAutorotateToInterfaceOrientation: – willRotateToInterfaceOrientation:duration: – willAnimateFirstHalfOfRotationToInterfaceOrientation:duration: – willAnimateSecondHalfOfRotationFromInterfaceOrientation:duration: – didRotateFromInterfaceOrientation: I imagine it is UIApplication (but maybe the AppDelegate or UIWindow). The next question, is how does the object know which UIViewController to talk to? How does it know which UIViewController has its view as the subview of the window? Is there a message you can send or a property you can set (of some object) that sets the "Active" UIViewController for the app?

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  • iPhone UITableView trigger a parent method?

    - by MidnightLightning
    Okay, so I'm working on an iPhone app with a preferences-esque section where there's a base TableView, which has one section, and several rows of customized cells to hold a name and a value label. Clicking on a row brings up another View, which allows the user to pick from a list (another TableView), and select an item. All of these TableViews are done programatically. The base TableView has a property that holds a Controller instance for each of the "pick from the list" Views. Each of the "pick from the list" views has a property called chosenValue that has the currently-selected option. I've gotten the UI to handle the didSelectRowAtIndexPath to update the chosenValue property and then "pop" the view (going back to the main TableView). But, even though the main TableView's cellForRowAtIndexPath method references the chosenValue property of the subview that's held in a property, the view doesn't update when an item is selected. In short, how can the sub-view trigger a reloadData on the parent object, after it "pops" and unloads?

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  • Are primitive types garbage collected in Android?

    - by snctln
    I know this may be a dumb question, but my background is more in c++ and managing my own memory. I am currently cutting down every single allocation that I can from one of my games to try and reduce the frequency of garbage collection and perceived "lag", so for every variable that I create that is an Object (String and Rect for example) I am making sure that I create it before hand in my constructor and not create temporary variables in simple 10 line functions... (I hope that makes sense) Anyways I was working though it some more tonight and I realized that I may be completely wrong about my assumption on garbage collection and primitive types (int, boolean, float) are these primitive type variables that I create in a 10 line function that gets called 20 times a second adding to my problem of garbage collection? So a year ago every few seconds I would see a message in logcat like GC freed 4010 objects / 484064 bytes in 101ms Now I see that message every 15-90 seconds or so... So to rephrase my question: Are primitive types (int, float, boolean, etc) included when seeing this message?

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  • array of UIView display?

    - by senthilmuthu
    Hi, If you see the URL in TRY ME simulator select cardex tab,if u scroll vertically on simulator(flash),the no of uiviews are coming,if u touch anything, it will be shown,any idea to do this ,have they used OPENGL? please any help?

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  • Why is my app running

    - by John Smith
    I have compiled my iPhone app with setting (Device, Release). I install it on the test machine and it runs with no problem. Here's the problem. The app is linked to a C++ library. The compilation on the simulator has no errors. However the device compilation produces 568 errors, mostly about different visibilities w.r.t AppDelegate.o. They all look like: QL::Error::~Error()has different visibility (default) in /QL/build/Release-iphoneos/libQLLibrary.a(abcd.o) and (hidden) in /Programming/ObjC/Second/build/Second.build/Release-iphoneos/FG.build/Objects-normal/armv6/AppDelegate.o Why is this, and how can I stop the errors anyway?

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  • Create a Editable Grid View as in iBooks

    - by tilomitra
    There have been some similar questions asked regarding Grid views, but none have been sufficiently answered (some have been left unanswered as the SDKs were under NDAs at the time). The question is: Can anyone direct me towards a tutorial, or explain to me what steps to take to create a Grid View similar to iBooks, or the Yahoo! Entertainment app on the iPhone? Here's a screenshot of what I mean.

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  • NSXMLParser & memory leaks

    - by HBR
    Hi, I am parsing an XML file using a custom class that instanciates & uses NSXMLParser. On the first call everything is fine but on the second, third and later calls Instruments show tens of memory leaks on certain lines inside didEndElement, didEndElement and foundCharacters functions. I googled it and found some people having this issue, but I didn't find anything that could really help me. My Parser class looks like this : Parser.h @interface XMLParser : NSObject { NSMutableArray *data; NSMutableString *currentValue; NSArray *xml; NSMutableArray *videos; NSMutableArray *photos; NSXMLParser *parser; NSURLConnection *feedConnection; NSMutableData *downloadedData; Content *content; Video *video; BOOL nowPhoto; BOOL nowVideo; BOOL finished; BOOL webTV; } -(void)parseXML:(NSURL*)xmlURL; -(int)getCount; -(NSArray*)getData; //- (void)handleError:(NSError *)error; //@property(nonatomic, retain) NSMutableString *currentValue; @property(nonatomic, retain) NSURLConnection *feedConnection; @property(nonatomic, retain) NSMutableData *downloadedData; @property(nonatomic, retain) NSArray *xml; @property(nonatomic, retain) NSXMLParser *parser; @property(nonatomic, retain) NSMutableArray *data; @property(nonatomic, retain) NSMutableArray *photos; @property(nonatomic, retain) NSMutableArray *videos; @property(nonatomic, retain) Content *content; @property(nonatomic, retain) Video *video; @property(nonatomic) BOOL finished; @property(nonatomic) BOOL nowPhoto; @property(nonatomic) BOOL nowVideo; @property(nonatomic) BOOL webTV; @end Parser.m #import "Content.h" #import "Video.h" #import "Parser.h" #import <CFNetwork/CFNetwork.h> @implementation XMLParser @synthesize xml, parser, finished, nowPhoto, nowVideo, webTV; @synthesize feedConnection, downloadedData, data, content, photos, videos, video; -(void)parseXML:(NSURL*)xmlURL { /* NSURLRequest *req = [NSURLRequest requestWithURL:xmlURL]; self.feedConnection = [[[NSURLConnection alloc] initWithRequest:req delegate:self] autorelease]; [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; */ [[NSURLCache sharedURLCache] setMemoryCapacity:0]; [[NSURLCache sharedURLCache] setDiskCapacity:0]; NSXMLParser *feedParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL]; //NSXMLParser *feedParser = [[NSXMLParser alloc] initWithData:theXML]; [self setParser:feedParser]; [feedParser release]; [[self parser] setDelegate:self]; [[self parser] setShouldResolveExternalEntities:YES]; [[self parser] parse]; } - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict { if ([elementName isEqualToString:@"articles"]) { self.finished = NO; self.nowPhoto = NO; self.nowVideo = NO; self.webTV = NO; if (!data) { NSMutableArray *tmp = [[NSMutableArray alloc] init]; [self setData:tmp]; [tmp release]; return ; } } if ([elementName isEqualToString:@"WebTV"]) { self.finished = NO; self.nowPhoto = NO; self.nowVideo = NO; self.webTV = YES; if (!data) { NSMutableArray *tmp = [[NSMutableArray alloc] init]; [self setData:tmp]; [tmp release]; return ; } } if ([elementName isEqualToString:@"photos"]) { if (!photos) { NSMutableArray *tmp = [[NSMutableArray alloc] init]; [self setPhotos:tmp]; [tmp release]; return; } } if ([elementName isEqualToString:@"videos"]) { if (!videos) { NSMutableArray *tmp = [[NSMutableArray alloc] init]; [self setVideos:tmp]; [tmp release]; return; } } if ([elementName isEqualToString:@"photo"]) { self.nowPhoto = YES; self.nowVideo = NO; } if ([elementName isEqualToString:@"video"]) { self.nowPhoto = NO; self.nowVideo = YES; } if ([elementName isEqualToString:@"WebTVItem"]) { if (!video) { Video *tmp = [[Video alloc] init]; [self setVideo:tmp]; [tmp release]; } NSString *videoId = [attributeDict objectForKey:@"id"]; [[self video] setVideoId:[videoId intValue]]; } if ([elementName isEqualToString:@"article"]) { if (!content) { Content *tmp = [[Content alloc] init]; [self setContent:tmp]; [tmp release]; } NSString *contentId = [attributeDict objectForKey:@"id"]; [[self content] setContentId:[contentId intValue]]; return; } if ([elementName isEqualToString:@"category"]) { NSString *categoryId = [attributeDict objectForKey:@"id"]; NSString *parentId = [attributeDict objectForKey:@"parent"]; [[self content] setCategoryId:[categoryId intValue]]; [[self content] setParentId:[parentId intValue]]; categoryId = nil; parentId = nil; return; } if ([elementName isEqualToString:@"vCategory"]) { NSString *categoryId = [attributeDict objectForKey:@"id"]; NSString *parentId = [attributeDict objectForKey:@"parent"]; [[self video] setCategoryId:[categoryId intValue]]; [[self video] setParentId:[parentId intValue]]; categoryId = nil; parentId = nil; return; } } - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { if (!currentValue) { currentValue = [[NSMutableString alloc] initWithCapacity:1000]; } if (currentValue != @"\n") [currentValue appendString:string]; } - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName { NSString *cleanValue = [currentValue stringByReplacingOccurrencesOfString:@"\n" withString:@""] ; if ([elementName isEqualToString:@"articles"]) { self.finished = YES; //[content release]; } if ([elementName isEqualToString:@"article"]) { [[self data] addObject:[self content]]; [self setContent:nil]; [self setPhotos:nil]; [self setVideos:nil]; /* [content release]; content = nil; [videos release]; videos = nil; [photos release]; photos = nil; */ } if ([elementName isEqualToString:@"WebTVItem"]) { [[self data] addObject:[self video]]; [self setVideo:nil]; //[video release]; //video = nil; } if ([elementName isEqualToString:@"title"]) { //NSLog(@"Tit: %@",cleanValue); [[self content] setTitle:cleanValue]; } if ([elementName isEqualToString:@"vTitle"]) { [[self video] setTitle:cleanValue]; } if ([elementName isEqualToString:@"link"]) { //NSURL *url = [[NSURL alloc] initWithString:cleanValue] ; [[self content] setUrl:[NSURL URLWithString:cleanValue]]; [[self content] setLink: cleanValue]; //[url release]; //url = nil; } if ([elementName isEqualToString:@"vLink"]) { [[self video] setLink:cleanValue]; [[self video] setUrl:[NSURL URLWithString:cleanValue]]; } if ([elementName isEqualToString:@"teaser"]) { NSString *tmp = [cleanValue stringByReplacingOccurrencesOfString:@"##BREAK##" withString:@"\n"]; [[self content] setTeaser:tmp]; tmp = nil; } if ([elementName isEqualToString:@"content"]) { NSString *tmp = [cleanValue stringByReplacingOccurrencesOfString:@"##BREAK##" withString:@"\n"]; [[self content] setContent:tmp]; tmp = nil; } if ([elementName isEqualToString:@"category"]) { [[self content] setCategory:cleanValue]; } if ([elementName isEqualToString:@"vCategory"]) { [[self video] setCategory:cleanValue]; } if ([elementName isEqualToString:@"date"]) { [[self content] setDate:cleanValue]; } if ([elementName isEqualToString:@"vDate"]) { [[self video] setDate:cleanValue]; } if ([elementName isEqualToString:@"thumbnail"]) { [[self content] setThumbnail:[NSURL URLWithString:cleanValue]]; [[self content] setThumbnailURL:cleanValue]; } if ([elementName isEqualToString:@"vThumbnail"]) { [[self video] setThumbnailURL:cleanValue]; [[self video] setThumbnail:[NSURL URLWithString:cleanValue]]; } if ([elementName isEqualToString:@"vDirectLink"]){ [[self video] setDirectLink: cleanValue]; } if ([elementName isEqualToString:@"preview"]){ [[self video] setPreview: cleanValue]; } if ([elementName isEqualToString:@"thumbnail_position"]){ [[self content] setThumbnailPosition: cleanValue]; } if ([elementName isEqualToString:@"url"]) { if (self.nowPhoto == YES) { [[self photos] addObject:cleanValue]; } else if (self.nowVideo == YES) { [[self videos] addObject:cleanValue]; } } if ([elementName isEqualToString:@"photos"]) { [[self content] setPhotos:[self photos]]; //[photos release]; //photos = nil; self.nowPhoto = NO; } if ([elementName isEqualToString:@"videos"]) { [[self content] setVideos:[self videos]]; //[videos release]; //videos = nil; self.nowVideo = NO; } //[cleanValue release]; //cleanValue = nil; [currentValue release]; currentValue = nil; } - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"Error" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release]; } -(NSArray*)getData { return data; } -(int)getCount { return [data count]; } - (void)dealloc { [parser release]; //[data release]; //[photos release]; //[videos release]; //[video release]; //[content release]; [currentValue release]; [super dealloc]; } @end Somewhere in my code, I create an instance of this class : XMLParser* feed = [[XMLParser alloc] init]; [self setRssParser:feed]; [feed release]; // Parse feed NSString *url = [NSString stringWithFormat:@"MyXMLURL"]; [[self rssParser] parseXML:[NSURL URLWithString:url]]; Now the problem is that after the first (which has zero leaks), instruments shows leaks in too many parts like this one (they are too much to enumerate them all, but all the calls look the same, I made the leaking line bold) : in didEndElement : if ([elementName isEqualToString:@"link"]) { // THIS LINE IS LEAKING => INSTRUMENTS SAYS IT IS A NSCFString LEAK [self content] setUrl:[NSURL URLWithString:cleanValue]]; [[self content] setLink: cleanValue]; } Any idea how to fix this pealse ? Could this be the same problem as the one mentioned (as an apple bug) by Lee Amtrong here :http://stackoverflow.com/questions/1598928/nsxmlparser-leaking

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  • Compile error when trying to _debug_ a Visual Stuio integration project

    - by Rune FS
    I'm currently working on a Visual Studio integration project for VS2010 (a custom highlighter) I'm using Irony and the LanguageServiceTemplate from this Code project article. However that template is build for 2008 and the changes made in VS2010 when it comes to integrating breaks the template. When I try to compile I get the following error: Source.extension.vsixmanifest file not found in project. If a file with this name is present in the project, make sure the build action is set to "None". Any ides of what I can do to fix it?

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  • Drawing triangle/arrow on a line with CGContext

    - by Pete
    Hi, I am using the framework of route-me for working with locations. In this code the path between two markers(points) will be drawn as a line. My Question: "What code should I add if I want to add an arrow in the middle(or top) of the line, so that it points the direction" Thanks - (void)drawInContext:(CGContextRef)theContext { renderedScale = [contents metersPerPixel]; float scale = 1.0f / [contents metersPerPixel]; float scaledLineWidth = lineWidth; if(!scaleLineWidth) { scaledLineWidth *= renderedScale; } //NSLog(@"line width = %f, content scale = %f", scaledLineWidth, renderedScale); CGContextScaleCTM(theContext, scale, scale); CGContextBeginPath(theContext); CGContextAddPath(theContext, path); CGContextSetLineWidth(theContext, scaledLineWidth); CGContextSetStrokeColorWithColor(theContext, [lineColor CGColor]); CGContextSetFillColorWithColor(theContext, [fillColor CGColor]); // according to Apple's documentation, DrawPath closes the path if it's a filled style, so a call to ClosePath isn't necessary CGContextDrawPath(theContext, drawingMode); }

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  • Objective C: Create arrays from first array based on value

    - by Nic Hubbard
    I have an array of strings that are comma separated such as: Steve Jobs,12,CA Fake Name,21,CA Test Name,22,CA Bill Gates,44,WA Bill Nye,21,OR I have those values in an NSScanner object so that I can loop through the values and get each comma seperated value using objectAtIndex. So, what I would like to do, is group the array items into new arrays, based on a value, in this case, State. So, from those, I need to loop through, checking which state they are in, and push those into a new array, one array per state. CA Array: Steve Jobs,12,CA Fake Name,21,CA Test Name,22,CA WA Array: Bill Gates,44,WA OR Array: Bill Nye,21,OR So in the end, I would have 3 new arrays, one for each state. Also, if there were additional states used in the first array, those should have new arrays created also. Any help would be appreciated!

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  • Beginning 3.2+ iPhone development

    - by Dinah
    I'm interested in learning Objective C for iPhone development. This is a topic which I realize has been covered to death. The qualifying difference is: I'd like to start learning beginning with the latest version (the most recent iPhone OS as of May, 2010 is ver. 3.2 and 4 beta is also out). I'd like to not have to wade through or unlearn legacy information. Using the links I've found throughout related topics on Stack Overflow, I'll read a blog post or tutorial which will say one thing, but then the comments will say, "this is different now in version xyz." For example, I've found this a few times regarding memory management/garbage collection. I assume that Apple's "getting started" doc.s will have the most recent info but many SO posts have said that those are not the most clear. The Stanford iPhone course looks great, but how do I know if it still applies to the most recent versions? Where should one start learning Objective C for iPhone development starting with version 3.2 or later without having as much exposure to legacy information?

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  • iphone app with role based login?

    - by chaitanya
    Can iPhone apps have role based login? In my application I have to display the content according to the role of the user (employee, visitor). Till now I havent seen any app with role based login for iphone. Can I develop role based login? is there any restriction from apple side for these kind of logins to approve the app?

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  • Trying to debug a 'Assertion failure in -[UIActionSheet showInView:]' error....

    - by dsobol
    I am working through "Beginning iPad Application Development" and am getting hung up in Chapter 3 where I have created a project that works with an Action Sheet. As it stands now, my application loads into the simulator just fine with no errors that I am aware of, but as it runs, it crashes with the following errors showing up in the debugger window: 2010-05-31 19:44:39.703 UsingViewsActionSheet[49538:207] * Assertion failure in -[UIActionSheet showInView:], /SourceCache/UIKit_Sim/UIKit-1145.66/UIAlert.m:7073 2010-05-31 19:44:39.705 UsingViewsActionSheet[49538:207] * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: view != nil' I am sure that this is the block where the app breaks based upon my use of breakpoints. //Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { UIActionSheet *action = [[UIActionSheet alloc] initWithTitle:@"This is my Action Sheet!" delegate:self cancelButtonTitle:@"OK" destructiveButtonTitle:@"Delete Message!" otherButtonTitles:@"Option 1", @"Option 2", @"Option 3", nil]; [action showInView:self.view]; // <-- This line seems to trigger the crash.... [action release]; [super viewDidLoad]; } Am I missing something obvious, or is there more to the problem than is shown here? I have looked at the abstract for showInView and cannot divine anything there yet. I appreciate any and all asssitance. Regards, Steve O'Sullivan

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  • How to add Timer to loop.

    - by mukeshpawar
    how to add timer to loop. i am making a urlConnection so i want that the loop execute for a time and if there is no connection it should exit. Does it work..... [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate dateWithTimeIntervalSinceNow:0.1f]]; Thanks in advance.

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  • How do I access variable values from one view controller in another?

    - by Thomas
    Hello all, I have an integer variable (time) in one view controller whose value I need in another view controller. Here's the code: MediaMeterViewController // TRP - On Touch Down event, start the timer -(IBAction) startTimer { time = 0; // TRP - Start a timer timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(updateTimer) userInfo:nil repeats:YES]; [timer retain]; // TRP - Retain timer so it is not accidentally deallocated } // TRP - Method to update the timer display -(void)updateTimer { time++; // NSLog(@"Seconds: %i ", time); if (NUM_SECONDS == time) [timer invalidate]; } // TRP - On Touch Up Inside event, stop the timer, decide stress level, display results -(IBAction) btn_MediaMeterResults { [timer invalidate]; NSLog(@"Seconds: %i ", time); ResultsViewController *resultsView = [[ResultsViewController alloc] initWithNibName:@"ResultsViewController" bundle:nil]; [self.view addSubview:resultsView.view]; } And in ResultsViewController, I want to process time based on its value ResultsViewController - (void)viewDidLoad { if(time < 3) {// Do something} else if ((time > 3) && (time < 6)) {// Do something else} //etc... [super viewDidLoad]; } I'm kind of unclear on when @property and @synthesize is necessary. Is that the case in this situation? Any help would be greatly appreciated. Thanks! Thomas

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  • Send SMS from iPhone app

    - by Ali
    I wanted to design an app that would send SMS messages to your contacts from within the app in the background. However, I cannot seem to find any tutorials on it and the Apple Docs arent anyhelp. I have also read somewhere that it is outright impossible. But if so, how does the app, iDistress manage to do it? It send text messages from preselected contacts with a custom message : http://www.buzapp.com/idistress.html Check out the screencast. Thanks.

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