包含UIAnimation块的递归方法，如何正确释放
我做了一个小的“加载器”，当我需要它时我可以将其粘贴在用户界面上。很像 UISpinnerView。
它有一些逻辑（我简化了本文块中的代码），需要递归调用它。我这样做：
- (void) blink {
tick++;
if (tick > kNumberOfLights)
tick = 0;
UIView *lightOne = [self viewWithTag:kLightStartIndex];
UIView *lightTwo = [self viewWithTag:kLightStartIndex+1];
[UIView animateWithDuration:0.5
delay: 0.0
options: UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionCurveEaseOut
animations:^{
if (tick == 0) {
[lightOne setAlpha:kLightOn];
[lightTwo setAlpha:kLightOff];
} else if (tick == 1) {
[lightOne setAlpha:kLightOff];
[lightTwo setAlpha:kLightOn];
}
}
completion:^(BOOL finished){
[self blink];
}];
}
当视图添加到超级视图时，调用方法[self眨眼]。
Loader类中没有保留任何对象，所以当我在超级视图中删除它时 它被释放了。问题是，如果当我释放视图时动画块正在运行，则完成块将调用已释放的对象并导致错误：
(20380,0xa0a29540) malloc: * mmap(size=2097152) 失败（错误 代码=12) *错误：无法分配区域
在控制台中，错误：
__[LoaderClass眨眼]_block_invoke_2
调试导航器中的
。 当视图从超级视图中删除时，如何确保正确地拆除该视图？
I did a small "loader" that I can stick on the UI when I need it. Much like the UISpinnerView.
It has some logic (I simplified the code in the block for this post) that require it to be recursively called. I do it like this:
- (void) blink {
tick++;
if (tick > kNumberOfLights)
tick = 0;
UIView *lightOne = [self viewWithTag:kLightStartIndex];
UIView *lightTwo = [self viewWithTag:kLightStartIndex+1];
[UIView animateWithDuration:0.5
delay: 0.0
options: UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionCurveEaseOut
animations:^{
if (tick == 0) {
[lightOne setAlpha:kLightOn];
[lightTwo setAlpha:kLightOff];
} else if (tick == 1) {
[lightOne setAlpha:kLightOff];
[lightTwo setAlpha:kLightOn];
}
}
completion:^(BOOL finished){
[self blink];
}];
}
The method [self blink] is called when the view is added to a super view.
There are no objects retained in the Loader class, so when I remove it in the super view
it is released. The problem is that if the animation block is running when I release the view, the completion block will call a deallocated object and cause the error:
(20380,0xa0a29540) malloc: * mmap(size=2097152) failed (error
code=12)
* error: can't allocate region
In the console and the error:
__[LoaderClass blink]_block_invoke_2
in the Debug Navigator.
How do I make sure to correctly tear down the view when it is removed from the super view?
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覆盖发布通常是一个坏主意，但这种情况可能是该规则的例外。
实例变量：
初始化 isBlinking = NO 和releaseWhenDoneAnimating = NO。
Overriding release is usually a bad idea, but this case might be an exception to the rule.
Instance variables:
Initialize isBlinking = NO and releaseWhenDoneAnimating = NO.