临时显示子视图

Question

我想要实现的是在几秒钟内显示一个视图而无需用户干预。与iphone上按下音量控制时出现的铃声音量视图效果相同：

我有一个带有图像的滚动视图，在图像中点击，声音开始播放，再次点击它会暂停。我想实现上述效果只是为了通知动作（显示播放/暂停图像）。

我希望我已经完美地解释了这个问题。

非常感谢您的帮助。

问候 哈维

Answer 1

假设你有一些继承自UIViewController 的类。您可以使用以下代码：

const int myViewTag = 10001;
const int myInterval = 1; // define the time you want your view to be visible

- (void)someAction {
    //this could be your `IBAction` implementation
    [self showMyView];
    [NSTimer scheduledTimerWithTimeInterval:myInterval
                                     target:self
                                   selector:@selector(hideMyView)
                                   userInfo:nil
                                    repeats:NO];
}


- (void) showMyView {
    //you can also use here a view that was declared as instance var
    UIView *myView = [[[UIView alloc] initWithFrame:CGRectMake(100, 100, 120, 120)] autorelease];

    myView.tag = myViewTag;
    [self.view addSubview:myView];
}

- (void) hideMyView {
    //this is a selector that called automatically after time interval finished
    [[self.view viewWithTag:myViewTag] removeFromSuperview];
}

你也可以在这里添加一些动画，但这是另一个问题:)