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POUnderstanding this Xcode 4.6 Allocations Instruments Output: Retain Cycle Detection
 

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  1. POUnderstanding this Xcode 4.6 Allocations Instruments Output: Retain Cycle Detection
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    <p>I think I'm getting a retain cycle. It happens as I push and dismiss a VC. Every time I push and dismiss, similar objects build up. </p> <p><img src="https://i.stack.imgur.com/OkZbt.png" alt="enter image description here"></p> <p>Can someone help me understand this profiler output. (photo above)</p> <p><strong>Question 1 + 1.5:</strong> It seems like an event triggers a GCD dispatch block that never gets released. Admitably I don't fully understand everything that is going on. What is this object (1.31mb highlighted object) and the the series of events in its life-cycle? Any idea why it is not being deallocated? </p> <p><strong>Question 2:</strong> Do you see any opportunities for Retain Cycles in the code below?</p> <p>iOS: 6</p> <p>xcode: 4.6</p> <p>tested: iphone 4 device</p> <h2>DetailViewController.h</h2> <pre><code>@interface SRDetailViewController : UIViewController @property (weak, nonatomic) IBOutlet UILabel *roomTitle; @property (weak, nonatomic) IBOutlet UIView *userScreenContainer; @property (weak, nonatomic) IBOutlet UIView *opponentScreenContainer; @property (weak, nonatomic) IBOutlet UILabel *statusLabel; @property (weak, nonatomic) IBOutlet UIButton *retryButton; @property (weak, nonatomic) IBOutlet UIProgressView *progressBar; @property (strong, nonatomic) NSTimer *progressTimer; @property (strong, nonatomic) NSTimer *retryTimer; @property (weak, nonatomic) IBOutlet UIView *bottomViewContainer; @property (strong, nonatomic) SRRoom *room; @property (strong, nonatomic) SROpenTokVideoHandler *openTokHandler; </code></pre> <h2>DetailViewController.m</h2> <pre><code>@interface SRDetailViewController () @property (strong, nonatomic) NSString* kApiKey; @property (strong, nonatomic) NSString* kSessionId; @property (strong, nonatomic) NSString* kToken; @end @implementation SRDetailViewController - (void)viewDidLoad { [super viewDidLoad]; [self configOpentTok]; [self performGetRoomRequest]; [self configNavBar]; [self configNotifcations]; [self configProgressBar]; } -(void)configSocialSharing { //check if it already exists for(UIView *subview in self.view.subviews){ if([subview isKindOfClass:[SRSocialSharing class]]){ return; } } //add off screen CGRect frame = CGRectMake(0, [[UIScreen mainScreen] bounds].size.height, [[UIScreen mainScreen] bounds].size.width, 44); SRSocialSharing *share = [[SRSocialSharing alloc] initWithFrame:frame]; [self.view addSubview:share]; share.sharingURL = [self createUrlForSharing]; //animate in frame = CGRectMake(0, [[UIScreen mainScreen] bounds].size.height-100, [[UIScreen mainScreen] bounds].size.width, 44); [UIView animateWithDuration:3 delay:2 options:UIViewAnimationOptionCurveEaseOut animations:^{ share.frame = frame; } completion:nil]; } -(NSURL *)createUrlForSharing { NSRange range = NSMakeRange(self.room.sessionId.length-7, 6); NSString *shortSessionId = [self.room.sessionId substringWithRange:range]; NSString *urlString = [NSString stringWithFormat:@"url/invites/%@/%@?sessionId=%@",self.room.topicId, [self opposingPosition:self.room.position],shortSessionId]; return [NSURL URLWithString:urlString]; } -(NSString *)opposingPosition:(NSString*)position { return ([position isEqualToString:@"agree"])? @"disagree" : @"agree"; } -(void) configOpentTok{ [self.openTokHandler registerUserVideoStreamContainer:self.userScreenContainer]; self.openTokHandler.userVideoStreamConatinerName = self.room.position; [self.openTokHandler registerOpponentOneVideoStreamContainer:self.opponentScreenContainer]; self.openTokHandler.opponentOneVideoStreamConatinerName = [self opposingPosition:self.room.position]; self.openTokHandler.shouldPublish = YES; self.openTokHandler.isObserving = NO; } -(void)configNavBar { UIImage *backButtonImage = [UIImage imageWithContentsOfFile:@"backButton"]; UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom]; [backButton setFrame:CGRectMake(0, 0, 47, 32)]; [backButton setImage:backButtonImage forState:UIControlStateNormal]; [backButton addTarget:self action:@selector(pressBackButton) forControlEvents:UIControlEventTouchUpInside]; UIBarButtonItem *navBackButton = [[UIBarButtonItem alloc] initWithCustomView:backButton]; [self.navigationItem setLeftBarButtonItem:navBackButton]; self.title = [self.room.position stringByReplacingCharactersInRange:NSMakeRange(0,1) withString:[[self.room.position substringToIndex:1] capitalizedString]]; } -(void)pressBackButton{ self.navigationItem.leftBarButtonItem.enabled = NO; [self manageSafeClose]; double delayInSeconds = 3; //[self updateStatusLabel:@"Disconnecting" withColor:[UIColor grayColor]]; dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC)); dispatch_after(popTime, dispatch_get_main_queue(), ^(void){ [self.navigationController popViewControllerAnimated:YES]; }); } -(void)configNotifcations { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(recieveNotifications:) name:kSROpenTokVideoHandlerNotifcations object:nil ]; } -(void)recieveNotifications:(NSNotification *)notification { if ([[notification name] isEqualToString:kSROpenTokVideoHandlerNotifcations]){ NSDictionary *userInfo = notification.userInfo; NSNumber *message = [userInfo objectForKey:@"message"]; [self statusMessage: message]; } } -(void)statusMessage:(NSNumber*)message{ NSString *result = nil; switch([message intValue]) { case 0: result = @"Disconnected"; break; case 1: result = @"Connecting..."; [self startRetryTimer]; break; case 2: result = @"Publishing Your Video..."; break; case 3: result = @"Searching for Idiots..."; break; case 4: result = @"Start!"; [self startProgressBar]; [self stopTimer:self.retryTimer]; break; case 5: [self stopTimer:self.progressTimer]; result = @"Stopped!"; break; case 6: [self stopTimer:self.progressTimer]; result = @"Disconnecting..."; break; case 7: result = @"Opponent failed to join. Retrying..."; [self performSelector:@selector(retry) withObject:nil afterDelay:4]; break; default: result = @"Retry"; } [self updateStatusLabel:result withColor:[self statusLabelColorPicker:message] animated:YES]; NSLog(@"STATUS LABEL UPDATE: %@", message); } -(UIColor*)statusLabelColorPicker:(NSString *)Message{ return [UIColor whiteColor]; } -(void)performGetRoomRequest{ __weak typeof(self) weakSelf = self; [[RKObjectManager sharedManager] getObject:weakSelf.room path:nil parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult){ weakSelf.openTokHandler.kToken = weakSelf.room.token; weakSelf.openTokHandler.kSessionId = weakSelf.room.sessionId; weakSelf.roomTitle.text = weakSelf.room.title; weakSelf.navigationController.title = weakSelf.room.position; [weakSelf configSocialSharing]; [weakSelf.openTokHandler doConnectToRoomWithSession]; }failure:^(RKObjectRequestOperation *operation, NSError *error){ }]; } -(void)dealloc { self.room = nil; } -(void)manageSafeClose{ [self stopTimer:self.retryTimer]; [self stopTimer:self.progressTimer]; [self.openTokHandler safetlyCloseSession]; [[RKObjectManager sharedManager].operationQueue cancelAllOperations]; self.openTokHandler = nil; self.title = nil; self.navigationItem.leftBarButtonItem = nil; self.kApiKey = nil; self.kSessionId= nil; self.kToken= nil; [[NSNotificationCenter defaultCenter] removeObserver:self]; [self doCloseRoom]; } -(void)doCloseRoom { __weak typeof(self) weakSelf = self; [[RKObjectManager sharedManager] deleteObject:weakSelf.room path:nil parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult){ //NSLog(@"Mapping result %@", mappingResult); } failure:nil ]; } -(void)startRetryTimer { NSLog(@"Timer Started"); self.retryTimer = [NSTimer scheduledTimerWithTimeInterval:(60*5) target:self selector:@selector(retry) userInfo:nil repeats:YES]; } -(void)retry { [self doCloseRoom]; [self performSelector:@selector(performGetRoomRequest) withObject:nil afterDelay:4]; } #pragma mark - label - (void)updateStatusLabel:(NSString *) message withColor:(UIColor*) color animated:(bool) animated { self.statusLabel.text = message; if (animated) { [self fadeOutFadeInAnimation:self.statusLabel andColor:color]; } else{ [SRAnimationHelper stopAnimations:self.statusLabel]; } } - (void)fadeOutFadeInAnimation:(UILabel *)label andColor:(UIColor*)color { //add animation [label.layer addAnimation:[SRAnimationHelper fadeOfRoomStatusLabel] forKey:nil]; //change label color label.textColor = color; } #pragma mark - Progress Bar -(void)configProgressBar { self.progressBar.progressTintColor = [UIColor orangeColor]; } -(void)startProgressBar { self.progressBar.hidden = NO; self.progressBar.progress = 0; self.progressTimer = [NSTimer scheduledTimerWithTimeInterval:.5 target:self selector:@selector(changeProgressValue) userInfo:nil repeats:YES]; } -(void)stopTimer: (NSTimer*)timer { [timer invalidate]; timer = nil; } - (void)changeProgressValue { dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ float progressValue = self.progressBar.progress; progressValue += .00834; if (progressValue &gt; .99) { progressValue = 1; [self stopTimer:self.progressTimer]; return; } NSString* time =[NSString stringWithFormat:@"%.0f", 60 - ceil(progressValue*60)]; NSLog(@"Progress Value %f Time %@", progressValue, time); NSString *message = [NSString stringWithFormat:@"Time Left: %@", time]; dispatch_async(dispatch_get_main_queue(), ^(void) { self.progressBar.progress = progressValue; [self updateStatusLabel:message withColor:[UIColor whiteColor] animated:NO]; }); }); } @end </code></pre>
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