移除动画后的UIView，而不会丢失其他元素

Question

如果我在这两者之间切换数百次会发生什么？将留下未使用的UIView s的汉德？ 我在主UIView上有几个控件，我想多次将它们作为一组控件进行动画（向上滑动和向下滑动），然后我决定将它们添加到UIView并为该视图添加动画。但似乎每次当我将view添加到superView时，它仍然存在，如果我运行[view removeFromSuperView]，它还会删除我已添加到view的所有控件。它会影响性能还是会导致内存泄漏问题？

(void)slideUp{ 
    repeatViewTop = datePickerButton.frame.origin.y; 
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, repeatViewTop)]; 
    [view addSubview:taskTitle]; 
    [view addSubview:taskNote]; 
    [view addSubview:datePickerButton]; 
    [view addSubview:taskSelectedDateViewer]; 
    [self.view addSubview:view]; 

    [UIView animateWithDuration:0.4f 
          delay:0.1f 
         options:UIViewAnimationOptionCurveEaseOut 
        animations:^{ 
         float tempY=view.frame.origin.y; 
         [view setCenter:CGPointMake(SCREEN_WIDTH/2,tempY)]; 
         [view setAlpha:0.4f]; 
        } 
        completion:^(BOOL finished){ 
        }]; 
    [self.view insertSubview:view atIndex:0]; 
} 

这会滑下这些控件：

- (void)slideDown{ 
    taskTitle.userInteractionEnabled=NO; 
    //150=view.frame.origin.y after sliding up 
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, -114, SCREEN_WIDTH, repeatViewTop)]; 
    [view addSubview:taskTitle]; 
    [view addSubview:taskNote]; 
    [view addSubview:datePickerButton]; 
    [view addSubview:taskSelectedDateViewer]; 
    [self.view addSubview:view]; 

    [UIView animateWithDuration:0.4f 
          delay:0.1f 
         options:UIViewAnimationOptionCurveEaseOut 
        animations:^{ 
         float tempY=view.frame.origin.y *(-1); 
         [view setCenter:CGPointMake(SCREEN_WIDTH/2,tempY)]; 
         [view setAlpha:1.0f]; 
        } 
        completion:^(BOOL finished){ 


        }]; 
    [self.view insertSubview:view atIndex:0]; 
} 

Answer 1

你应该在视图中添加元素只有一次，并保持引用您的看法，然后进行动画处理它，而不是插入它所有的时间。

您可以在viewDidLoad代表随时创建视图一样，就像这样：

- (void)viewDidLoad { 
    //Other code here 


    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, repeatViewTop)]; 
    view.tag = 1999; 
    [view addSubview:taskTitle]; 
    [view addSubview:taskNote]; 
    [view addSubview:datePickerButton]; 
    [view addSubview:taskSelectedDateViewer]; 
    [self.view addSubview:view]; 
} 

然后得到像这样在你的动画视图的参考：

(void)slideUp{ 
    repeatViewTop = datePickerButton.frame.origin.y; 
    UIView *view = [self.view viewWithTag:1999]; 

    [UIView animateWithDuration:0.4f 
          delay:0.1f 
         options:UIViewAnimationOptionCurveEaseOut 
        animations:^{ 
         float tempY=view.frame.origin.y; 
         [view setCenter:CGPointMake(SCREEN_WIDTH/2,tempY)]; 
         [view setAlpha:0.4f]; 
        } 
        completion:^(BOOL finished){ 
        }]; 
}