屏幕红光闪烁(用于警报)

首先在屏幕覆盖一层View, 将其透明度设置成透明

self.redView =[[UIView alloc] initWithFrame:kMainScreenFrame];
self.redView.backgroundColor = KcolorRed;
[kMainWindow addSubview:self.redView];
[self.redView setAlpha:0];
        

闪烁事件如下, 根据自己需要添加在何处

//屏幕红光闪烁
- (void)screenFlicker {
    //定时器的添加为了屏幕一直闪烁
    if (self.twinkleTime) {
        [self.twinkleTime invalidate];
        self.twinkleTime = nil;
    }
    self.twinkleTime = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(screenFlicker) userInfo:nil repeats:YES];
    
    [self.redView setAlpha:1];
    [UIView beginAnimations:@"flash screen" context:nil];
    [UIView setAnimationDuration:1.0f];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
    [self.redView setAlpha:0.0f];
    [UIView commitAnimations];
}