关于CATransition的filter属性

OSX关于filter的属性的介绍：

需要设置 view 的wantLayer属性和layerUsesCoreImageFilters属性为YES;

然后看下面的代码块

   
    CIFilter* aFilter = [CIFilter filterWithName:@"CIMotionBlur"];
    [aFilter setDefaults];
    
   
    // Create the transition object
    CATransition* transition = [CATransition animation];
    transition.startProgress = 0;
    transition.endProgress = 1.0;
    transition.filter = aFilter;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    transition.duration = 5.0;
  
    [self.imageView.layer addAnimation:transition forKey:@"transition"];

但是我还是发现，他不渐渐变模糊的，而是一下就模糊然后再等很久再处理下面的事情

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