内存管理示例

Question

这是我的一个类中的一些代码，我想知道我是否正确地处理了内存，或者我是否在哪里泄漏了内存？

@implementation CardViewController
@synthesize playerImage;
@synthesize cardLabel;
@synthesize card;
@synthesize frontView;
@synthesize backView;
@synthesize nameLabel;
@synthesize infoLabel;
@synthesize delegate;

-(void) initialiseButtons 
{
NSLog(@"initialiseButtons  %d",totalButtons);
int ypos = playerImage.frame.origin.y + playerImage.frame.size.height + 42;
for(int i=0; i<totalButtons; i++) 
{       
    StatView *sv = [[StatView alloc] initWithYPos:ypos];
    sv.tag = 100 + i;
    [sv.overlayButton addTarget:self action:@selector(statTapped:)    
                 forControlEvents:UIControlEventTouchUpInside];
    sv.overlayButton.tag = 10 + i;
    [self.frontView addSubview:sv];
    ypos += 26;
}
}

-(IBAction) statTapped:(id) sender 
{

UIButton *tappedButton = (UIButton *)sender;
int tag = tappedButton.tag;
if(delegate && [delegate respondsToSelector:@selector(cardTapped:)]) {
    [delegate cardTapped:tag-10];
}
 }

-(void) viewDidLoad 
{
NSLog(@" viewDidLoad CVC");
[self initialiseButtons];

metaData = [[NSArray alloc]     
      initWithObjects:@"Height",@"Weight",@"Games",@"Attack",@"Defense", nil];
 }

-(void) setCard:(Card *)newCard 
{
NSLog(@"setCard");
[card release];
card = [newCard retain];
[self updateUI];
}

- (void)dealloc 
{
[card autorelease];
[metaData autorelease];
 [super dealloc];
}

@end

我应该在哪里释放StatView *sv = [StatView alloc :ypos]；如果我释放它，每一次循环都会产生问题吗？除此之外，我还能处理剩下的内存吗？

谢谢-Code

Answer 1

1. 在此行之后发布新的StatView

[self.frontView addSubview:sv];

[sv release]; // frontView retains sv

• Release在dealloc中声明为retain或copy的所有属性。候选属性: playerImage、cardLabel等。发送release消息，而不是autorelease

\\[card autorelease];

[card release];

• In viewDidUnload释放所有声明为IBOutlet的属性，并将变量设置为nil

[frontView release], frontView = nil;

Answer 2

是的，当您将该StatView插入到视图层次结构中时，您应该在每次循环迭代结束时释放它。

Answer 3

您应该尝试一下内置到XCode中的分析器，因为它非常擅长发现这些类型的内存泄漏。来个look吧。