以形如
_fontValueChangedBlock = ^(){
[self.fontSmallButton addTarget:self action:@selector(btnFontSmallClicked) forControlEvents:UIControlEventTouchUpInside];
};
的代碼為例，這個(gè)代碼運(yùn)行會(huì)報(bào)警告羊娃。"capturing self strongly in this block is likely to lead to a retain cycle”
要想消除這個(gè)警告向楼，需要將代碼改為如下形式：
__weak typeof(self) weakSelf = self;
_fontValueChangedBlock = ^(){
typeof(weakSelf) __strong strongSelf = weakSelf;
[strongSelf.fontSmallButton addTarget:strongSelf action:@selector(btnFontSmallClicked) forControlEvents:UIControlEventTouchUpInside];
};
