CAAnimationGroup 运行太快

Question

我的 CAAnimationGroup 运行速度过快。我希望它总共需要 50 秒来做某事，而它在大约 3 秒内就完成了……它轻而易举地通过第一个动画，而另一个则慢了。

hover = [CABasicAnimation animationWithKeyPath:@"position"];
        hover.fillMode = kCAFillModeForwards;
        hover.removedOnCompletion = NO;
        hover.additive = YES; // fromValue and toValue will be relative instead of absolute values
        hover.fromValue = [NSValue valueWithCGPoint:CGPointZero];
        hover.toValue = [NSValue valueWithCGPoint:CGPointMake(26*22, 26*-10.0)]; // y increases downwards on iOS
        hover.autoreverses = FALSE; // Animate back to normal afterwards

        hover.repeatCount = 0; // The number of times the animation should repeat

       CABasicAnimation *fall = [CABasicAnimation animationWithKeyPath:@"position"];
        fall.fillMode = kCAFillModeForwards;
        fall.removedOnCompletion = NO;
        fall.additive = YES; // fromValue and toValue will be relative instead of absolute values
        fall.fromValue = [NSValue valueWithCGPoint:CGPointMake(26*22, 26*-10.0)];
        fall.toValue = [NSValue valueWithCGPoint:CGPointMake(26*22, guess1*700.0)]; // y increases downwards on iOS
        fall.autoreverses = FALSE; // Animate back to normal afterwards

        fall.repeatCount = 0; // The number of times the animation should repeat

        CAAnimationGroup*   group = [CAAnimationGroup new];
        group.beginTime = 0.;
        [group setDuration:50.0];
        group.animations = @[ hover, fall ];

        [theDude.layer addAnimation:group forKey:@"myHoverAnimation"];

Answer 1

从你的实现来看，我假设你想要一个对象 theDude 上的 sequence 动画在它的 position 属性上。

您可以使用CATransaction 使用它的完成块来实现动画。更多可以阅读here。