Question

我开发了一个没有 XIB 文件的 iPhone 工程。我手动创建了 UIView 对象, 以及该视图上的另外几个组件。我将这些对象放入我的 < code> dealloc 和 < code> ViewAidunload 方法中。我的问题是, 如果我放出 UIView, 程序会崩溃, 我不知道为什么。有人能帮我吗?

这是我的代码:

allmessengersview = [[UIView alloc] initWithFrame: [[UIScreen mainScreen] bounds]]; 
allmessengersview.backgroundColor = [UIColor whiteColor];
self.view = allmessengersview;

-(void) dealloc { 
    [allmessengersview release]; 
    [super dealloc]; 
} 

- (void) viewDidUnload { 
    [super viewDidUnload];
    [allmessengersview release]; 
    allmessengersview = nil;
 }

Answer 1

请在视图中初始化时写入此代码

allmessengersview=[[UIView alloc]init];
allmessengersview.frame = CGRect (0,0,320,480);
allmessengersview.backgroundColor = [UIColor whiteColor]; 
[self.view addsubView: allmessengersview];

请在交易方法中写下此代码

-(void)dealloc 
{
    [allmessengersview release]; 
    [super dealloc];
}

Answer 2

Don t release in viewDidUnload. This way the app will release allmessengersview in the viewDidUnload and later on it tries to release it a second time in dealloc, but since it s already released, the app crashes.

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