objective-c - initWithContentRect 和 setContentView 中的内存泄漏

Question

在我的应用程序中，我正在创建一个窗口并设置内容 View 。检查器向我展示了一些内存泄漏。

在setContentView:中，我认为它释放了以前的NSView。

我的代码如下:

//contentrect is NSRect which is already initialized.
//stylemask is NSUInteger which is also initialized.
//window_ is of NSWindow type.
window_ = [NSWindow alloc];

//Here, I am getting memory leak.
window_ = [window_ initWithContentRect:contentrect styleMask:stylemask 
        backing:NSBackingStoreBuffered defer:NO];

//Set window delegate to receive close notication.
[window_ setDelegate:delegate_];

//I believe this is the behavior is by default.
//[window_ setReleasedWhenClosed:YES];

//Setting the windows title.
[window_ setTitle:title_];

//Setting the window frame screenrect which is also initialized.
[window_ setFrame:screenrect display:YES animate:YES];

//MyView is inherited from NSView.

//Set MyView instead of default NSView.
//Set as it have same content rectangle.

contentrect = [[window_ contentView] frame];
//Allocate MyView.
MyView * view = [[MyView alloc] initWithFrame:contentrect];


[window_ setContentView:view];


[rWindow orderFront:nil];

编辑:我在调用的 setContentView 中没有出现内存泄漏，但在内部调用为 initWithContentRect 的 setContentView 中没有出现内存泄漏。

Answer 1

您必须平衡保留/释放计数

你必须在某个地方释放window_，其中一个地方将在dealloc

- (void)dealloc
{
    [window_ release]; window_ = nil;
    // other releases
    [super dealloc];
}

在不同的行中alloc init是一个坏主意

同样，您必须在 setContentView 之后添加 [view release]; 来释放您的view

或自动释放它

MyView * view = [[[MyView alloc] initWithFrame:contentrect] autorelease];

如果你不知道 Objective-C 中的管理是如何工作的，你最好先切换到 ARC 并详细了解它是如何工作的。