是否有必要使用弱引用自我总是在块内？
我使用自我内部块，我通过一些苹果的文档，但仍然找不到正确的答案困惑。
I am getting confused with use of self inside blocks, I go through some of Apple's documents but still cannot find the right answer.
有些人总是说使用弱
示例1：
self.handler = ^(id response, NSError *error)
{
self.newresponse = response; //use weak self here
};
示例2：
;
__weak myViewController *weakSelf = self;
[UIView animateWithDuration:interval delay:0.0 options:curve animations:^
{
[weakSelf.view.superview setTransform:CGAffineTransformMakeTranslation(0, -106)];
//in above is it use of weak is neassary
}
completion:^(BOOL finished)
{
}];
没有弱自我;
__weak myViewController *weakSelf = self;
[UIView animateWithDuration:interval delay:0.0 options:curve animations:^
{
[myViewController.view.superview setTransform:CGAffineTransformMakeTranslation(0, -106)];
}
completion:^(BOOL finished)
{
}];
在上面的例子中，
**我使用ARC
In the above samples, which are correct…? **I am using ARC
您应该只使用弱引用 self ，如果 self 将保留对块的引用。
You should only use a weak reference to self, if self will hold on to a reference of the block.
例如，您不是在 self 中保留对块的引用，您只使用与 UIView animateWithDuration：，因此没有必要使用 __ weak myViewController * weakSelf = self;
In your example, you are not keeping a reference to your block in self, you are only using blocks inline with the UIView animateWithDuration:, and as such there is no need to use __weak myViewController *weakSelf = self;
案件？因为一个块将保留对它使用的任何变量的强引用。这包括 self 。现在如果类实例本身保持对块的强引用，并且块保持对类实例的强引用，那么您将有一个保留周期，这将导致内存泄漏。
Why is this the case? Because a block will retain strong references to any variables it uses from the class using the block. This includes self. Now if the class instance itself keeps a strong reference to the block, and the block keeps a strong reference to the class instance, you have a retain cycle, which will cause memory leaks.