关于iOS block中警告问题的一些整理

1. block 中调用自身会出现警告，需要补上：__weak typeof  (payTypeView) *weakSheet = sheet;  

__weak typeof  (payTypeView) *weakSheet = sheet;
sheet.myActionSheetBtnClick = ^ (NSString *str) {

[weakSheet hide];
};

2. block 中对self 的处理：__weak __typeof(self)weakSelf =
self;  或者  __strong
__typeof(weakSelf)strongSelf = weakSelf;

__weak typeof(self) weakSelf = self;
//点击键盘
self.NumKeyBoard.completeBlock = ^(NSString *text,NSInteger tag) {

switch (tag) {
case 9:
//点击完成按钮
[weakSelf.NumKeyBoard dismiss];
break;
case 11:
//点击删除按钮
[weakSelf clickDeleteBtn];
break;
default:
//点击数字键盘
[weakSelf.textField changTextWithNSString:text];
break;
}

};

3.block 中对 变量的使用处理：__block  NSString *modifyText;

__block NSString *modifyText;
sheet.myActionSheetBtnClick = ^(UIButton *btn)
{
modifyText = arr[btn.tag];

[self.tableView reloadData];

};
[sheet show];