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PORetain Cycle on Retain Cycles
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  1. PORetain Cycle on Retain Cycles
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    copied!<p>I'm seeing a gradual build up of memory that I think might be a retain cycle. </p> <p><strong>When does this happen:</strong> Click on a custom cell that expands and injects a nib with 3 buttons into the expanded area. Clicking the cell again closes the cell, shrinks the cell's tablerow height, rotates an open indicator and removes the previously injected nib.</p> <p>If I open and close the cell multiple times I see the memory gradually building up. </p> <p>Any ideas what might be causing this would be greatly appreciated. </p> <p>Sorry I don't have enough reputation to post photos. </p> <p>Build up: <img src="https://i.stack.imgur.com/P064S.png" alt="http://imgur.com/Up6iAPr"></p> <p>Example of retained objects(mostly Animation related): <img src="https://i.stack.imgur.com/JTEK0.png" alt="http://imgur.com/8X2Tr8L"></p> <p>EDIT: Using ARC and on iOS 6</p> <h2>MasterViewController - TableView Functions</h2> <pre><code>#pragma mark - UITABLEVIEW - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { // Return the number of sections. return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [self.topicsArray count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { NSString *CellIdentifier2 = @"SRCollapsibleCellClosed"; SRCollapsibleCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier2]; if (cell == nil) { cell = [[SRCollapsibleCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier2]; } SRTopic *topic = [self.topicsArray objectAtIndex:indexPath.row]; [cell updateWithTopic:topic]; if([self isCellOpen:indexPath]){ CGAffineTransform transformation = CGAffineTransformMakeRotation(M_PI/2); cell.arrow.transform = transformation; if(![self hasChoiceBox:cell]){ [self insertChoiceBox:cell atIndex:indexPath]; } } else{ CGAffineTransform transformation = CGAffineTransformMakeRotation(0); cell.arrow.transform = transformation; } return cell; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { if([self isCellOpen:indexPath]){ [self closeCellAtIndexPath:indexPath]; } else{ NSIndexPath * openCell= self.openCellIndex; NSIndexPath * newOpenCell= indexPath; [self closeCellAtIndexPath:openCell]; [self openCellAtIndexPath:newOpenCell]; } [tableView beginUpdates]; [tableView endUpdates]; [tableView deselectRowAtIndexPath:indexPath animated:NO]; } -(CGFloat)tableView: (UITableView*)tableView heightForRowAtIndexPath: (NSIndexPath*) indexPath { if([indexPath isEqual:self.openCellIndex]){ return 217.0; } else { return 63.0; } } -(void)rotateCellArrowAtIndexPath:(NSIndexPath*)indexPath willOpen:(bool)willOpen Animated:(bool)animated{ // Change Arrow orientation SRCollapsibleCell *cell = (SRCollapsibleCell*) [self.topicsTableView cellForRowAtIndexPath:indexPath]; CGAffineTransform transformation; if(willOpen){ transformation = CGAffineTransformMakeRotation(M_PI/2); } else { transformation = CGAffineTransformMakeRotation(0); } if(animated){ [UIView animateWithDuration:.2 delay:0 options:nil animations:^{ cell.arrow.transform = transformation; } completion:nil]; } else{ cell.arrow.transform = transformation; } } -(BOOL)isCellOpen:(NSIndexPath *)indexPath{ return [indexPath isEqual:self.openCellIndex]; } -(void)closeCellAtIndexPath:(NSIndexPath*)indexPath{ //NSLog(@"Cell closing"); [self rotateCellArrowAtIndexPath:indexPath willOpen:NO Animated:YES]; [self removeSRChoiceBoxFromCellAtIndexPath:indexPath]; self.openCellIndex = nil; } -(void)openCellAtIndexPath:(NSIndexPath*)indexPath{ [self rotateCellArrowAtIndexPath:indexPath willOpen:YES Animated:YES]; SRCollapsibleCell *cell = (SRCollapsibleCell*)[self.topicsTableView cellForRowAtIndexPath:indexPath]; [self insertChoiceBox:cell atIndex:indexPath]; self.openCellIndex = indexPath; } -(void)removeSRChoiceBoxFromCellAtIndexPath:(NSIndexPath *)indexPath{ SRCollapsibleCell *cell = (SRCollapsibleCell*) [self.topicsTableView cellForRowAtIndexPath:indexPath]; for(id subview in cell.SRCollapsibleCellContent.subviews){ if([subview isKindOfClass:[SRChoiceBox class]]){ SRChoiceBox *tempBox = subview; [tempBox removeFromSuperview]; tempBox.delegate = nil; tempBox = nil; } } } -(void)insertChoiceBox: (SRCollapsibleCell *)cell atIndex:(NSIndexPath *) indexPath { //SRChoiceBox *newBox = [[SRChoiceBox alloc] initWithFrame:CGRectMake(0, 0, 310, 141)]; SRChoiceBox *newBox = [[SRChoiceBox alloc] init]; SRTopic *topic = [self.topicsArray objectAtIndex:indexPath.row]; [newBox updateWithSRTopic:topic]; newBox.delegate = self; [cell.SRCollapsibleCellContent addSubview:newBox]; cell = nil; topic = nil; newBox = nil; } -(bool)hasChoiceBox:(SRCollapsibleCell *)cell{ for(UIView *subview in cell.SRCollapsibleCellContent.subviews){ if([subview isKindOfClass:[SRChoiceBox class]]){ return true; } } return false; } </code></pre> <h2>SRChoiceBox - UIView object that gets inserted into cell</h2> <pre><code>//.h @protocol SRChoiceBoxDelegate &lt;NSObject&gt; -(void)positionWasChoosen: (NSString *)choice topicId: (NSNumber *)topicId; @end @interface SRChoiceBox : UIView -(id) initWithLabel: (NSDictionary *)labels andTopicID: (NSNumber *)topicId andFrame:(CGRect)frame; @property (nonatomic, weak) IBOutlet UIView *SRChoiceBox; @property (nonatomic, strong) NSNumber *SRTopicId; @property (nonatomic, weak) id&lt;SRChoiceBoxDelegate&gt; delegate; @property (weak, nonatomic) IBOutlet UILabel *agreeCount; @property (weak, nonatomic) IBOutlet UILabel *disagreeCount; @property (weak, nonatomic) IBOutlet UILabel *observeCount; -(IBAction)buttonPress:(id)sender; -(void)updateWithSRTopic:(SRTopic *)topic; .... //.m -(id)init{ self = [super init]; if (self) { UINib *nib = [UINib nibWithNibName:@"SRChoiceBox" bundle:nil]; NSArray *q = [nib instantiateWithOwner:self options:nil]; [self addSubview:q[0]]; } return self; } -(void)updateWithSRTopic:(SRTopic *)topic { self.SRTopicId = topic.topicId; self.agreeCount.text = [NSString stringWithFormat: @"%@",topic.agreeDebaters]; self.disagreeCount.text = [NSString stringWithFormat: @"%@",topic.disagreeDebaters]; self.observeCount.text = [NSString stringWithFormat: @"%@",topic.observers]; } - (IBAction)buttonPress:(id) sender { int tag = [sender tag]; switch (tag) { case 0: [self.delegate positionWasChoosen:@"agree" topicId:self.SRTopicId]; break; case 1: [self.delegate positionWasChoosen: @"disagree" topicId:self.SRTopicId]; break; case 2: [self.delegate positionWasChoosen: @"observe" topicId:self.SRTopicId]; break; default: break; } } - (void)dealloc { self.SRChoiceBox =nil; self.SRTopicId=nil; self.delegate=nil; self.agreeCount=nil; self.disagreeCount=nil; self.observeCount=nil; //NSLog(@"choicebox deallocated: %@", self); } </code></pre> <h2>SRCollapsibleCell -- Reusable cell</h2> <p>//.h</p> <pre><code>@interface SRCollapsibleCell : UITableViewCell @property (strong) NSNumber *topicId; @property (strong) NSDictionary *topicStats; @property (weak, nonatomic) IBOutlet UILabel *title; @property (weak, nonatomic) IBOutlet UILabel *subtitle; @property (weak, nonatomic) IBOutlet UILabel *agreeDebaters; @property (weak, nonatomic) IBOutlet UILabel *disagreeDebaters; @property (weak, nonatomic) IBOutlet UILabel *observers; @property (weak, nonatomic) IBOutlet UIImageView *arrow; @property (weak, nonatomic) IBOutlet UIView *SRCollapsibleCellContent; //-(void)updateWithTopic:(NSDictionary *) stats; -(void)formatTitle:(NSString *)title; -(void)updateWithTopic: (SRTopic *)topic; @end </code></pre> <p>//.m</p> <pre><code>@implementation SRCollapsibleCell - (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier { self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]; if (self) { } return self; } -(void)formatTitle:(NSString *)title{ if(title.length&lt;30){ self.title.text= title; self.subtitle.text =@""; } else { NSArray *splitString = [self splitString:title maxCharacters:30]; self.title.text = splitString[0]; self.subtitle.text = splitString[1]; splitString = nil; title = nil; } } ////http://www.musicalgeometry.com/?p=1197 - (NSArray *)splitString:(NSString*)str maxCharacters:(NSInteger)maxLength { NSMutableArray *tempArray = [NSMutableArray arrayWithCapacity:1]; NSArray *wordArray = [str componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]; NSInteger numberOfWords = [wordArray count]; NSInteger index = 0; NSInteger lengthOfNextWord = 0; while (index &lt; numberOfWords &amp;&amp; tempArray.count&lt;2) { NSMutableString *line = [NSMutableString stringWithCapacity:1]; while ((([line length] + lengthOfNextWord + 1) &lt;= maxLength) &amp;&amp; (index &lt; numberOfWords)) { lengthOfNextWord = [[wordArray objectAtIndex:index] length]; [line appendString:[wordArray objectAtIndex:index]]; index++; if (index &lt; numberOfWords) { [line appendString:@" "]; } } [tempArray addObject:line]; NSMutableString *subtitle = [NSMutableString stringWithCapacity:1]; while(index&lt;numberOfWords){ [subtitle appendString:[wordArray objectAtIndex:index]]; [subtitle appendString:@" "]; index++; } [tempArray addObject:subtitle]; break; } return tempArray; } //Breaks MVC but it makes the MasterVC cleaner -(void)updateWithTopic: (SRTopic *)topic { [self formatTitle:topic.title]; self.topicId = topic.topicId; self.agreeDebaters.text = [NSString stringWithFormat:@"%@",topic.agreeDebaters]; self.disagreeDebaters.text = [NSString stringWithFormat:@"%@", topic.disagreeDebaters]; self.observers.text = [NSString stringWithFormat:@"%@", topic.observers]; } - (void)setSelected:(BOOL)selected animated:(BOOL)animated { [super setSelected:selected animated:animated]; } @end </code></pre>
 

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