Objective-C 在子视图数组中跟踪我的视图

发布于 2024-12-17 18:43:33 字数 398 浏览 4 评论 0原文

我有一个关于内存管理的问题。例如，我有一个 iPhone 应用程序，它使用多个以编程方式创建的视图。例如以编程方式生成的按钮。

    UIButton *myButton=[UIButton alloc] initWithFrame:...; //etc

然后，通常我们将这个按钮添加到子视图数组中：

    [self.view addSubview:myButton];

然后我们释放按钮。

    [myButton release]

当我需要删除此按钮时，如何在子视图数组中跟踪此按钮？我知道我可以使用标签属性来做到这一点，但我认为存在另一种方法来与其保持联系。

原文

I have a question about memory management.
For example I have an iPhone application that uses multiply programmatically created views.
for example programmatically generated buttons.

    UIButton *myButton=[UIButton alloc] initWithFrame:...; //etc

then, normally we add this button to subviews array:

    [self.view addSubview:myButton];

then we releasing button.

    [myButton release]

When I need to remove this button how can I keep track on this button in subviews array?
I know I can do this using tag property but I think exists another way to keep connection with it.

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南城旧梦 2024-12-24 18:43:33

您可以简单地将它分配给实例变量：

UIButton *myButton = ...;
[self.view addSubView:myButton];
myInstanceVariable = myButton;
[myButton release];

您只需要小心：一旦您执行类似 [myInstanceVariable removeFromSuperview]; 的操作，它可能会立即被释放（如果您没有保留它）然后它会指向无效的内存。

You can simply assign it to an instance variable:

UIButton *myButton = ...;
[self.view addSubView:myButton];
myInstanceVariable = myButton;
[myButton release];

You just need to be careful: as soon as you do something like [myInstanceVariable removeFromSuperview]; it might get deallocated immediately (if you haven't retained it) and it would then point to invalid memory.

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白色秋天 2024-12-24 18:43:33

您可以尝试在某处声明 UIButton* 类型的保留属性，可以将指针值分配给您的按钮实例：

@interface myclass
@property (retain, nonatomic) UIButton *savedButton;
@end

@implementation myclass
@synthesize savedButton;

- (void) someMethod...
{
  ...
  UIButton *myButton=[UIButton alloc] initWithFrame:...;
  [self.view addSubview:myButton];
  self.savedButton = myButton;
  [myButton release];
  ...
}
...
@end

You can try to declare somewhere a retain property of UIButton* type, that can be assigned with pointer value to your button instance:

@interface myclass
@property (retain, nonatomic) UIButton *savedButton;
@end

@implementation myclass
@synthesize savedButton;

- (void) someMethod...
{
  ...
  UIButton *myButton=[UIButton alloc] initWithFrame:...;
  [self.view addSubview:myButton];
  self.savedButton = myButton;
  [myButton release];
  ...
}
...
@end

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