block使用笔记

@property (nonatomic,copy) block myblock;

 //全局属性block防止循环引用，局部block可以直接使用self;

//    __weak __typeof(self) weakSelf = self;等价于__weak MRBaseViewController *weakSelf = self;

    __weak MRBaseViewController *weakSelf = self;

    self.myblock = ^( int i){

    weakSelf.bgView.backgroundColor = [UIColor greenColor];

    };

    self.myblock(1);