Strongly in this block is likely to lead to a retain cycle [duplicate]

问题

This question already has answers here:

Fix warning “Capturing [an object] strongly in this block is likely to lead to a retain cycle” in ARC-enabled code (7 answers)

Closed 5 years ago.

I create the custom cell with the activity indicator view With using the SDWebImage I hidden the activity indicator when the image is downloaded

[customCell.userPhotoImageView setImageWithURL:[NSURL URLWithString:[[thisNotify user]imageURL]] placeholderImage:nil completed:^
 (UIImage *image, NSError *error, SDImageCacheType cacheType)
 {
     customCell.activityView.hidden = TRUE;
 }];

But I execute the code I look this warning

Capturing 'customCell' strongly in this block is likely to lead to a retain cycle

Thanks

回答1:

You can try something like this just before that block call:

__weak UICustomCell * weakCustomCell = customCell;
[customCell.userPhotoImageView setImageWithURL:....^{
   weakCustomCell.activityView.hidden = YES;
}];

I think that will fix the error. You just assign a new weakly referenced object to your cell, which should prevent the retain cycle. Not entirely sure of the reasoning behind it, but worth a shot.

edit here's a potential explanation though

来源：https://stackoverflow.com/questions/27335587/strongly-in-this-block-is-likely-to-lead-to-a-retain-cycle