我看到记忆的逐渐积累，我认为这可能是一个保留周期。
何时发生：单击一个自定义单元格，该单元格展开并在展开区域中注入一个带有 3 个按钮的笔尖。再次单击该单元格将关闭该单元格，缩小该单元格的表格高度，旋转一个打开的指示器并移除先前注入的笔尖。
如果我多次打开和关闭牢房，我会看到记忆逐渐积累。
任何可能导致这种情况的想法将不胜感激。
抱歉，我没有足够的声誉来发布照片。
积聚：
保留对象的示例（主要与动画相关）：
编辑：使用 ARC 和 iOS 6
MasterViewController - 表视图函数
#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;
}
SRchoiceBox - 插入单元格的 UIView 对象
//.h
@protocol SRChoiceBoxDelegate <NSObject>
-(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<SRChoiceBoxDelegate> 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);
}
SRCollapsibleCell -- 可重复使用的单元格
//。H
@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
//.m
@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<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 < numberOfWords && tempArray.count<2) {
NSMutableString *line = [NSMutableString stringWithCapacity:1];
while ((([line length] + lengthOfNextWord + 1) <= maxLength) && (index < numberOfWords)) {
lengthOfNextWord = [[wordArray objectAtIndex:index] length];
[line appendString:[wordArray objectAtIndex:index]];
index++;
if (index < numberOfWords) {
[line appendString:@" "];
}
}
[tempArray addObject:line];
NSMutableString *subtitle = [NSMutableString stringWithCapacity:1];
while(index<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