UIButton关闭了UIView

Question

我如何解雇超过主要内容的UIView？可以将其视为带有关闭按钮的巡视弹出窗口.这是我正在使用的代码,但它不起作用.没有错误或警告,似乎没有做到这一点.有任何想法吗？

    - (void) showUserSettings {
        UIView *settingsPopover = [[UIView alloc] init];
        settingsPopover.frame = CGRectMake(20, 600, 280, 350);
         [settingsPopover.layer setBackgroundColor:[UIColor colorWithRed:(241/255.0) green:(241/255.0) blue:(241/255.0) alpha:1].CGColor];

        [UIView animateWithDuration:0.35 animations:^{
            settingsPopover.frame =  CGRectMake(20, 130, 280, 350);
            settingsPopover.alpha = 1.0f;
        } completion:^(BOOL finished) {
        }];


        UIButton *closeSettings = [[UIButton alloc] initWithFrame:CGRectMake(245, 0, 35, 40)];
        [closeSettings setBackgroundColor:[UIColor colorWithRed:(212/255.0) green:(121/255.0) blue:(146/255.0) alpha:1]];
        [closeSettings setTitle:@"X" forState:UIControlStateNormal];
        [closeSettings addTarget:self action:@selector(closeSettings) forControlEvents:UIControlEventTouchUpInside];

        [settingsPopover addSubview:closeSettings];
        [self.view addSubview:settingsPopover];
    }

    - (void) closeSettings {
        [UIView animateWithDuration:0.35 animations:^{
        _settingsPopover.frame =  CGRectMake(20, 400, 280, 350);
        _settingsPopover.alpha = 1.0f;
        } completion:^(BOOL finished) {
         [_settingsPopover removeFromSuperview];
        }];
    }

Answer 1

您正尝试删除本地创建的视图,但稍后当您尝试从超级视图中删除它时,您没有引用它.

这就是你所做的,你创建并初始化了一个新的UIView settingsPopover

UIView *settingsPopover = [[UIView alloc] init];    
...
[self.view addSubview:settingsPopover];

然后,您将删除另一个名称_settingsPopover,该视图与showUserSettings方法中的本地创建的视图无关.

我假设你已经创建了一个UIView名为的全局变量_settingsPopover.如果是这种情况,那么应该在你的-(void)showUserSettings方法中添加一行并更改另一行来修复它.看看下面:

-(void)showUserSettings{
    ...
    [settingsPopover addSubview:closeSettings]; <-- in your method the code up to here is fine

    // add this line before your addsubview code
    _settingsPopover = settingsPopover; //We are copying over your local variable to your global variable

    //and change this line from 'settingsPopover' to '_settingsPopover'
    [self.view addSubview:_settingsPopover]; 

这样settingsPopover,您在showUserSettings方法中本地创建的新创建的类型视图变量将被复制到名为_settingsPopovervariable 的全局变量,这就是您要添加为子视图的变量.

这样,您可以参考它以后,当你想从你已与做的SuperView删除它[_settingsPopover removeFromSuperview];在你的closeUserSettings方法.你所有的其他代码都没问题.