slider

获得window

  • 弹出的模态view覆盖了整个屏幕,这种UIView必须添加到window中。
UIWindow *window = self.view.window;
...
// 令overlayView捕获所有触摸事件,从而阻止这些事件到达下方的其他GUI
overlayView.userInteractionEnabled = YES;
...
[window addSubview:overlayView];

弹出数秒后消失

[self performSelector:@selector(removeOverlay:) withObject:overlayView afterDelay:5.0f];

即等待5s然后调用:

[self removeOverlay:overlayView];

当然,removeOverlay方法就很简单了:

- (void)removeOverlay:(UIView *)overlayView
{
    [overlayView removeFromSuperview];
}

关于userInteractionEnabled

对于UIView该值默认为YES,在本例中若设置overlayView的userInteractionEnabled为NO效果是这样的:

bug