ios - 混合 CABasicAnimation 和 CGAffineTransform 动画

Question

我需要连续旋转 UIImageView。为此，我找到了这段代码:

if ([self.image.layer animationForKey:@"SpinAnimation"] == nil) {

        CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
        animation.fromValue = [NSNumber numberWithFloat:0.0f];
        animation.toValue = [NSNumber numberWithFloat: 2 * M_PI];
        animation.duration = 90.0f;
        animation.repeatCount = INFINITY;
        [self.image.layer addAnimation:animation forKey:@"SpinAnimation"];
    }

然后，我需要在 ImageView 上进行变换转换，并为其设置动画。如果我这样做:

CGAffineTransform transform = self.image.transform;
transform = CGAffineTransformTranslate(transform, 0, 350);
[UIView animateWithDuration:1.0f animations:^{

        [self.view layoutIfNeeded];
        self.image.transform = transform;
    } completion:^(BOOL finished) {

        self.isMiddleViewOpened = YES;
    }];

执行动画时，图像会在到达平移终点之前在 View 周围漂浮。谢谢☺️

编辑我有问题，因为在我的第二次转换中我只编辑了 y 值，但图像并不只在 y 轴上移动。如果您尝试此代码，您将看到问题

Answer 1

无法混合两种动画，您可以使用 Core animation 来完成所有动画工作。

我在启动画面中使用它来旋转四个图像 block ，最后将它们组合成一个。

动画是这样的:

一个图像 block 的代码: 左上角 block ，我称之为 00 block

- (void)addSplashScreenAnimationWithCompletion:(void (^)(BOOL finished))completionBlock
{
    [self addSplashScreenAnimationWithBeginTime:0 andFillMode:kCAFillModeBoth andRemoveOnCompletion:NO completion:completionBlock];
}

- (void)addSplashScreenAnimationWithBeginTime:(CFTimeInterval)beginTime andFillMode:(NSString *)fillMode andRemoveOnCompletion:(BOOL)removedOnCompletion completion:(void (^)(BOOL finished))completionBlock
{
    CAMediaTimingFunction *linearTiming = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];

    if (completionBlock)
    {
        CABasicAnimation *representativeAnimation = [CABasicAnimation animationWithKeyPath:@"not.a.real.key"];
        representativeAnimation.duration = 8.500; //your duration
        representativeAnimation.delegate = self;
        [self.layer addAnimation:representativeAnimation forKey:@"SplashScreen"];

    }

    CAKeyframeAnimation *_00RotationAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"];
    _00RotationAnimation.duration = 8.500;
    _00RotationAnimation.values = @[@(0.000), @(18.829), @(18.829)];
    _00RotationAnimation.keyTimes = @[@(0.000), @(0.353), @(1.000)];
    _00RotationAnimation.timingFunctions = @[linearTiming, linearTiming];
    _00RotationAnimation.beginTime = beginTime;
    _00RotationAnimation.fillMode = fillMode;
    _00RotationAnimation.removedOnCompletion = removedOnCompletion;


    CAKeyframeAnimation *_00OpacityAnimation = [CAKeyframeAnimation animationWithKeyPath:@"opacity"];
    _00OpacityAnimation.duration = 8.500;
    _00OpacityAnimation.values = @[@(0.000), @(0.497), @(0.553), @(0.759), @(0.921), @(1.000), @(0.642), @(0.341), @(0.000), @(0.000)];
    _00OpacityAnimation.keyTimes = @[@(0.000), @(0.059), @(0.118), @(0.176), @(0.235), @(0.353), @(0.471), @(0.647), @(0.765), @(1.000)];
    _00OpacityAnimation.timingFunctions = @[linearTiming, linearTiming, linearTiming, linearTiming, linearTiming, linearTiming, linearTiming, linearTiming, linearTiming];
    _00OpacityAnimation.beginTime = beginTime;
    _00OpacityAnimation.fillMode = fillMode;
    _00OpacityAnimation.removedOnCompletion = removedOnCompletion;


    CAKeyframeAnimation *_00ScaleXAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale.x"];
    _00ScaleXAnimation.duration = 8.500;
    _00ScaleXAnimation.values = @[@(0.600), @(0.600), @(1.187), @(1.187)];
    _00ScaleXAnimation.keyTimes = @[@(0.000), @(0.353), @(0.765), @(1.000)];
    _00ScaleXAnimation.timingFunctions = @[linearTiming, linearTiming, linearTiming];
    _00ScaleXAnimation.beginTime = beginTime;
    _00ScaleXAnimation.fillMode = fillMode;
    _00ScaleXAnimation.removedOnCompletion = removedOnCompletion;

    CAKeyframeAnimation *_00ScaleYAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale.y"];
    _00ScaleYAnimation.duration = 8.500;
    _00ScaleYAnimation.values = @[@(0.688), @(0.688), @(1.359), @(1.359)];
    _00ScaleYAnimation.keyTimes = @[@(0.000), @(0.353), @(0.765), @(1.000)];
    _00ScaleYAnimation.timingFunctions = @[linearTiming, linearTiming, linearTiming];
    _00ScaleYAnimation.beginTime = beginTime;
    _00ScaleYAnimation.fillMode = fillMode;
    _00ScaleYAnimation.removedOnCompletion = removedOnCompletion;


    CAKeyframeAnimation *_00TranslationXAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.translation.x"];
    _00TranslationXAnimation.duration = 8.500;
    _00TranslationXAnimation.values = @[@(0.000), @(107.423), @(211.936), @(211.936)];
    _00TranslationXAnimation.keyTimes = @[@(0.000), @(0.353), @(0.765), @(1.000)];
    _00TranslationXAnimation.timingFunctions = @[linearTiming, linearTiming, linearTiming];
    _00TranslationXAnimation.beginTime = beginTime;
    _00TranslationXAnimation.fillMode = fillMode;
    _00TranslationXAnimation.removedOnCompletion = removedOnCompletion;


    CAKeyframeAnimation *_00TranslationYAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.translation.y"];
    _00TranslationYAnimation.duration = 8.500;
    _00TranslationYAnimation.values = @[@(0.000), @(390.498), @(476.237), @(476.237)];
    _00TranslationYAnimation.keyTimes = @[@(0.000), @(0.353), @(0.765), @(1.000)];
    _00TranslationYAnimation.timingFunctions = @[linearTiming, linearTiming, linearTiming];
    _00TranslationYAnimation.beginTime = beginTime;
    _00TranslationYAnimation.fillMode = fillMode;
    _00TranslationYAnimation.removedOnCompletion = removedOnCompletion;


}

上述方法包含一系列动画，如旋转、不透明度变化、沿 x 和 y 轴缩放、沿 x 和 y 轴平移。您需要子类化 UIImageView 或 UIView 并将动画放在那里。

你可以像这样调用上面的方法:

 //Here _splashView can be UIView or UIImageView

[_splashView addSplashScreenAnimationWithCompletion:^(BOOL finished) {

      //Do your stuff after animation is completed
}];

你也可以为 CAKeyFrameAnimation 使用 repeatCount，你应该给 HUGE_VALF 来获得无限时间旋转。