连续60秒连续显示多个CALayer？ [英] Displaying Multiple CALayers one after another continuously for 60 seconds?

问题描述

我在这里遇到了一个情况。

I have a situation over here.

我正在使用AVFoundation捕获摄像机帧。
现在我要做的是对于某些帧，我需要显示一张逐步旋转的图片。

I am using AVFoundation to capture the camera frame. Now what i want to do is that for certain frames, i need to display a picture which revolves in a step by step fashion.

我正在尝试要做的是，我要拍摄4个CALayers，包括一个对象的前后左右图像，并使用CALayer time属性和group animation属性，我想在一定的毫秒间隔后逐个显示所有图像，以便连续图像似乎就像是动画。

What I am trying to do is that I am taking 4 CALayers comprising of front back left and right images of an object and using CALayer time property and group animation property, i want to display all the images one by one after certain milli seconds interval of time so that the continuous images seems to be like an animation.

如何处理？

推荐答案

-(void)startMainAnimation
{
  //Animationframes is array of images that should be CGImage Type not UIImage..
  //animation Layer that is added above view……


  CAKeyframeAnimation *frameAnimation = [[CAKeyframeAnimation alloc] init];
  [frameAnimation setKeyPath:@"contents"];
  frameAnimation.calculationMode = kCAAnimationDiscrete;
  [animationLayer setContents:[animationFrames lastObject]];
  frameAnimation.autoreverses = NO;
  frameAnimation.duration = ((float)[animationFrames count])/4.5;;
  frameAnimation.repeatCount = 1;
  [frameAnimation setValues:animationFrames];
  [frameAnimation setRemovedOnCompletion:YES];
  [frameAnimation setDelegate:self];
  [animationLayer addAnimation:frameAnimation forKey:@"contents"];
  [frameAnimation release];

}

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