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POMemory Management
 

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    <p>How is method removeFromSuperView: really works? I got a problem of memory bad access when I want to reinit the view</p> <pre><code>- (id)init { if (!(self = [super init])) return nil; _mainView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; NSLog(@"retainCount :%d", [_mainView retainCount]); UIButton *reInitButton = [[UIButton alloc] initWithFrame:CGRectMake(0.0f,0.0f,90.0f,35.0f)]; [reInitButton addTarget:self action:@selector(buttonDidTapped:) forControlEvents:UIControlEventTouchUpInside]; [[self view] addSubView:_mainView]; NSLog(@"retainCount :%d", [_mainView retainCount]); [_mainView release]; NSLog(@"retainCount :%d", [_mainView retainCount]); return self; } - (void)buttonDidTapped:(id)sender { [_mainView removeFromSuperView]; //crash during second times press the button NSLog(@"retainCount :%d", [_mainView retainCount]); _mainView = [[UIView alloc] initWithFrame[[UIScreen mainScreen] bounds]]; [[self view] addSubView:_mainView]; NSLog(@"retainCount :%d", [_mainView retainCount]); [_mainView release]; NSLog(@"retainCount :%d", [_mainView retainCount]); } </code></pre> <p>I have NSLog every times there are any retain or alloc or release keyword. And the result is very weird.</p> <pre><code>//init retainCount : 1 retainCount : 2 retainCount : 1 //1st time pressed button retainCount : 1 //remove super view didn't decrease retainCount : 2 retainCount : 1 //2nd time pressed button retainCount : 0 //crash. Memory bad access </code></pre> <p>The weird thing is why it didn't crash on 1st time pressed??</p>
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