如何以编程方式闪烁屏幕？ [英] How to flash screen programmatically?

问题描述

经过长时间的搜索后，我不得不放弃要求。

可以闪光屏

如果是，那么如何？

感谢您提供答案。

解决方案

将白色全屏UIView添加到窗口，并将其动画化为alpha（播放持续时间和动画曲线，你想要）：

   - （void）flashScreen {
 UIWindow * wnd = [UIApplication sharedApplication] .keyWindow; 
 UIView * v = [[[UIView alloc] initWithFrame：CGRectMake（0，0，wnd.frame.size.width，wnd.frame.size.height）] autorelease]; 
 [wnd addSubview：v]; 
 v.backgroundColor = [UIColor whiteColor]; 
 [UIView beginAnimations：nil context：nil]; 
 [UIView setAnimationDuration：1.0]; 
 v.alpha = 0.0f; 
 [UIView commitAnimations]; 
} 
  

编辑：动画结束后不要忘记删除该视图

After long time of searching I have to give up and ask.

Is it possible to flash screen (just like in taking screenshot using home button + power button) ?

If yes, then how ?

Thanks in advance for answers.

解决方案

Add the white full-screen UIView to the window and animate it's alpha (play with duration and animation curve to get result that you want):

 -(void) flashScreen {
    UIWindow* wnd = [UIApplication sharedApplication].keyWindow;
    UIView* v = [[[UIView alloc] initWithFrame: CGRectMake(0, 0, wnd.frame.size.width, wnd.frame.size.height)] autorelease];
    [wnd addSubview: v];
    v.backgroundColor = [UIColor whiteColor];
    [UIView beginAnimations: nil context: nil];
    [UIView setAnimationDuration: 1.0];
    v.alpha = 0.0f;
    [UIView commitAnimations];
}

Edit: don't forget to remove that view after animation is ended

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