Block的强强引用问题(循环引用)

 //block传值
    __weak SubjectViewController *weakSelf = self;//解决强强引用的问题
    cell.clickBlock = ^(AppItem *aItem){
        DetailViewController *dvc = [[DetailViewController alloc]init];
        dvc.applicationId = aItem.applicationId;
        
        weakSelf.hidesBottomBarWhenPushed = YES;
        [weakSelf.navigationController pushViewController:dvc animated:YES];
        weakSelf.hidesBottomBarWhenPushed = NO;
    };

 

//block的循环引用(你持有我,我持有你)
    /*
     1.self(controller) self.view 持有红色的view
     2.因为使用了 block,红色的 view 持有self
     */
    // self(控制器) -> self.view -> 红色的 view -> block -> self
    
    
    __weak SecondViewController *tmpSelf = self;
    [viewRed didBeganBlock:^(UIView *view) {
        NSLog(@"began");
        tmpSelf.view.backgroundColor = [UIColor blueColor];
    } movedBlock:^(UIView *view) {
        NSLog(@"move");
    } endBloac:^(UIView *view) {
        NSLog(@"end");
    }];