启动动画渐变扩大并消失

 // 启动动画渐变扩大并消失，此段代码写在AppDelegate启动方法最底下，覆盖在Window上。消失后就移除掉

 

    UIImageView *splashScreen = [[UIImageView alloc] initWithFrame:self.window.bounds];

 

    splashScreen.image = [UIImage imageNamed:@"begin.png"];

 

    [self.window addSubview:splashScreen];

 

    [UIView animateWithDuration:3.0f animations:^{

 

        splashScreen.layer.transform = CATransform3DMakeScale(1.5, 1.5, 1.0);

 

        splashScreen.alpha = 0;

 

    } completion:^(BOOL finished) {

 

        [splashScreen removeFromSuperview];

 

    }];