CABasicAnimation无法在iOS7中工作

Question

我正在尝试将微调器添加到视图中，并使用以下代码对其进行动画处理。它在iOS 6中工作完全正常，但不会在iOS 7的微调不旋转

下面是创建与微调

- (CALayer *)spinnerLayer 
{ 
CALayer *result = nil; 

UIImage *spinnerImage = [UIImage imageNamed:@"spin.png"]; 
if (spinnerImage != nil) 
{ 
    CGSize size = [spinnerImage size]; 
    CALayer *layer = [[CALayer alloc] init]; 
    if (layer != nil) 
    { 
     [layer setFrame:CGRectMake(0.0, 0.0, size.width, size.height)]; 

     [layer setContents:(id)[spinnerImage CGImage]]; 

     CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; 
     if (anim != nil) 
     { 
      [anim setToValue:@(M_PI * 2.0)]; 

      [anim setRepeatCount:INFINITY]; 
      [anim setDuration:1.0]; 
      [anim setFillMode:kCAFillModeBoth]; 

      [layer addAnimation:anim forKey:@"Rotation"]; 
     } 

     result = [[layer retain] autorelease]; 

     [layer release]; 
    } 
} 

return result; 

}

Answer 1

固定它的一层功能通过仅在显示图像视图的视图控制器的viewDidAppear中添加动画。

有益的见解，从here