ALAssetsLibrary结果块弱参考或强参考

Question

For the call

[library assetForURL:referenceURL resultBlock:^(ALAsset *asset){...}

If I am to pass the image to an ImageView, should I pass the ImageView with a weak reference or should it be a strong reference? Can I ever go wrong with passing a weak reference? By weak reference I mean

__weak MyVC *weakSelf = self; 
....
weakSelf.myImageView...

Answer 1

Block retains the object they reference and in turn will create a retain cycle. In your above code snippet, the block creates the retain cycle, you need to use weak reference to break the retain cycle as

 __weak typeof(self) *weakself = self;

or you can also implement it in following way

__block MyVC *blockSelf = self;

and reference the blockSelf inside the block.

This avoids the cycle, because blockSelf is not retained