uiimageview-UImagview實現漸變隱藏

UImagview實現漸變隱藏

實現UImagview漸變然後隱藏。

代碼：

   CABasicAnimation *theAnimation;
   theAnimation=[CABasicAnimation animationWithKeyPath:@"opacity"];
   theAnimation.duration=1.0;
   theAnimation.fromValue=[NSNumber numberWithFloat:1.0];
   theAnimation.toValue=[NSNumber numberWithFloat:0.0];
   [flowerImageView.layer addAnimation:theAnimation forKey:@"animateOpacity"];

沒實現等到值成為0.0時，imageView就完全隱藏起來。

最佳回答：

沒有回掉方法，用一個NSTimer

 CABasicAnimation *theAnimation;
 theAnimation=[CABasicAnimation animationWithKeyPath:@"opacity"];
 theAnimation.duration=1.0;
 theAnimation.fromValue=[NSNumber numberWithFloat:1.0];
 theAnimation.toValue=[NSNumber numberWithFloat:0.0];
 [flowerImageView.layer addAnimation:theAnimation forKey:@"animateOpacity"];

 [NSTimer scheduledTimerWithTimeInterval:theAnimation.duration
    target:self
    selector:@selector(targetMethod)
    userInfo:nil
    repeats:NO];

在動畫結束後調用：

-(void)targetMethod
{
     flowerImageView.hidden = YES;
}