我有一个情况在这里。
我使用AVFoundation捕获相机框架。 现在我想要做的是，对于某些帧，我需要显示其在旋转一步步的时尚图片。
我所要做的是，我服用4个CALayers包含前方的物体的背面左图像和右图像，并且使用的CALayer时间属性和组动画属性，我要通过一个特定毫秒的时间间隔后，以显示所有的图像的一个时间，使得连续图像看起来像一个动画。
如何做呢？ 请帮我在这里一些编码。
Answer 1:
-(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];
}
Answer 2:
答莫希特Gupta的pastie联系的基础上：
设置CALayer的要在其上的图像序列动画
CALayer *animationLayer = [CALayer layer];
[animationLayer setFrame:CGRectMake(125, 0, 240, 300)];
[self.baseLayer addSublayer:animationLayer];
限定在序列动画显示所需图像的阵列
NSArray *animationFrames = [NSArray arrayWithObjects:(id)[UIImageimageNamed:@"1.png"].CGImage, (id)[UIImage imageNamed:@"2.png"].CGImage, (id)[UIImage imageNamed:@"3.png"].CGImage, nil];
使用CAKeyframeAnimation以显示顺序方式的图像阵列
CAKeyframeAnimation *frameAnimation = [[CAKeyframeAnimation alloc] init];
[frameAnimation setKeyPath:@"contents"];
frameAnimation.calculationMode = kCAAnimationDiscrete; //mode of transformation of images
[animationLayer setContents:[animationFrames lastObject]]; //set the array objects as encounterd
frameAnimation.autoreverses = NO; //If set Yes, transition would be in fade in fade out manner
frameAnimation.duration = ((float)[animationFrames count])/4.5; //set image duration , it can be predefined float value
frameAnimation.repeatCount = HUGE_VAL; //this is for inifinite, can be set to any integer value as well
[frameAnimation setValues:animationFrames];
[frameAnimation setRemovedOnCompletion:YES];
[frameAnimation setDelegate:self];
[animationLayer addAnimation:frameAnimation forKey:@"contents"]; //add animation to your CALayer
[frameAnimation release];
希望这可以帮助
文章来源: Displaying Multiple CALayers one after another continuously for 60 seconds?
