解决block循环引用--ARC

🌟用__weak,__unsafe_unretained解决

    __weak typeof(self) weakSelf = self;
    self.block = ^{
        __strong typeof(weakSelf) myself = weakSelf;
        
        NSLog(@"age is %d", myself->_age);
    };


    __unsafe_unretained typeof(self) weakSelf = self;
    self.block = ^{
        NSLog(@"age is %d", weakSelf.age);
    };

Screen Shot 2020-04-17 at 5.51.27 PM.png

🌟用__block解决（必须要调用block）

__block id weakSelf = self;
self.block = ^{
     printf("%p",weakSelf);
     weakSelf = nil;
};
self.block();

Screen Shot 2020-04-17 at 5.53.20 PM.png