iOS 關於Block的使用及循環引用

 
    BlockButton *button = [[BlockButton alloc] initWithFrame:CGRectMake(10, 10, 100, 40)];
    [button setTitle:@"touch me" forState:UIControlStateNormal];
    button.backgroundColor = [UIColor orangeColor];
    [self.view addSubview:button];
    [button release];
    
//    NSMutableArray *array = [[NSMutableArray alloc] initWithObjects:@"jack", nil]; //1
//    NSLog(@"1.block訪問前 array.retainCount=%d",array.retainCount);
//    //創建block塊，傳個button，當button被按下時則調用此block
//    /*
//     當此block被copy後,如果block訪問了局部對象
//     則會將block中引用的局部對象都retain一下,防止此對象被銷燬掉
//     */
//    [button addTouchBlock:^(BlockButton *button) {
//        NSLog(@"array=%@",array);
//        NSLog(@"2.block訪問後 array.retainCount=%d",array.retainCount);
//    }];    
//    [array release];


    /*
     當此block被copy後,如果block訪問了當前對象的實例變量或方法，則會對當前對象retain
     */
    __block DetialViewController *this = self;
    NSLog(@"1.block訪問前,self.retainCount=%d",self.retainCount);
    [button addTouchBlock:^(BlockButton *button) {
        NSLog(@"%@",this->_data);
        NSLog(@"2.block訪問後%d",this.retainCount);
    }];
    
//    [button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];
    
    
//    [UIView beginAnimations:nil context:nil];
//    [UIView setAnimationDuration:0.4];
//    
////    button.frame = CGRectMake
//    [UIView commitAnimations];
    
    
    [UIView animateWithDuration:0.4 animations:^{
//        button.frame = CGRectMake(<#CGFloat x#>, <#CGFloat y#>, <#CGFloat width#>, <#CGFloat height#>);
    }];
    
    
}

//- (void)buttonAction {
//    NSLog(@"2.block訪問後,%d",self.retainCount);
//}