core-animation - CAKeyframeAnimation

嗨，我要从多个图像创建关键帧动画。我的问题是我希望动画立即从一个图像更改为下一个图像，而不是淡入淡出。

    CALayer *animLayer = [CALayer layer];
    animLayer.bounds = CGRectMake(0, 0, width, height);
    animLayer.position = CGPointMake(0, 0);

    CAKeyframeAnimation *customFrameAnimation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];
    NSArray *sizeValues = [NSArray arrayWithObjects:(id)image1, (id)image2, nil];
    NSArray *times = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0f], [NSNumber numberWithFloat:0.5f], nil];
    NSArray *timingFunctions = [NSArray arrayWithObjects: [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault], [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault], nil];

    [customFrameAnimation setValues:sizeValues];
    [customFrameAnimation setKeyTimes:times];

    customFrameAnimation.duration=5.0;
    customFrameAnimation.beginTime = 1e-100;
    customFrameAnimation.fillMode = kCAFillModeRemoved;
    customFrameAnimation.timingFunctions = timingFunctions;
    customFrameAnimation.removedOnCompletion = YES;
    [animLayer addAnimation:customFrameAnimation forKey:nil];

提前致谢。

最佳答案

您的动画将需要将其CalculationMode设置为kCAAnimationDiscrete。
看一看documentation on keyTimes，它描述了如何使用calculationMode:

然后，您可以阅读计算模式的说明:

换句话说，离散计算模式使动画跳到每个关键帧，而不是为其动画/过渡。
此致。

关于core-animation - CAKeyframeAnimation，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/4024685/