Will的部落格

此範例要介紹的是當iOS使用螢幕截圖時,

瞬間所閃爍的白光特效,

首先在interface範圍中宣告一個property

@property (strong, nonatomic) IBOutlet UIView *flashView;

 接著viewdidload中初始化閃屏畫面

/*initalize the  flash frame*/
    self.flashView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
    [self.flashView setAlpha:0];
    [self.view addSubview:self.flashView];

 最後再加入以下method就能在你想要觸發的地方使用此特效

-(void)fleshDefaultEffect
{
    [self.flashView setAlpha:1];
    [UIView beginAnimations:@"flash screen" context:nil];
    [UIView setAnimationDuration:0.6f];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
    [self.flashView setAlpha:0.0f];
    [UIView commitAnimations];
}