如何使用延迟设置显式 CA 动画的最终值

Posted 2023-03-16

【中文标题】如何使用延迟设置显式 CA 动画的最终值

【英文标题】：How to set final value of explicit CA Animation with Delay

【发布时间】：2014-07-06 14:17:02

【问题描述】：

我有一个明确的动画，我想在其中设置最终值，以便对象停留在终点。但是我如何在延迟动画上实现这一点：这是代码：

CAKeyframeAnimation *moveAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    moveAnimation.duration = 0.3;
    moveAnimation.cumulative = YES;
    moveAnimation.repeatCount = 1;

    // Bounce
    [moveAnimation setValues:[NSArray arrayWithObjects:
                         [NSValue valueWithCGPoint:[self getCoordinatePointForAnimationWithRadius:0 withIndex:i]],
                         [NSValue valueWithCGPoint:[self getCoordinatePointForAnimationWithRadius:radius + 10 withIndex:i]],
                         [NSValue valueWithCGPoint:[self getCoordinatePointForAnimationWithRadius:radius - 5 withIndex:i]],
                         [NSValue valueWithCGPoint:[self getCoordinatePointForAnimationWithRadius:radius withIndex:i]], nil]];

    [moveAnimation setKeyTimes:[NSArray arrayWithObjects:
                           [NSNumber numberWithFloat:0],
                           [NSNumber numberWithFloat:0.5],
                           [NSNumber numberWithFloat:0.75],
                           [NSNumber numberWithFloat:1.0], nil]];

    [moveAnimation setTimingFunctions:[NSArray arrayWithObjects:
                                       [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut], nil]];



    moveAnimation.beginTime = CACurrentMediaTime() + 1 + (0.1 * i);


    [layer addAnimation:opacityAnimation forKey:@"opacityAnimationUp"];
    [layer addAnimation:moveAnimation forKey:@"moveAnimationUp"];

// That's not working correctly because of the delay
    [layer setOpacity:1.0];
    [layer setPosition:[self getCoordinatePointForAnimationWithRadius:radius withIndex:i]];

谢谢！

来自德国的问候， 克里斯

【参考方案1】：

看起来唯一缺少的是向后填充模式。这将导致动画在添加后立即显示第一个值，即使实际动画被延迟：

moveAnimation.fillMode = kCAFillModeBackwards;

【讨论】：

哇，成功了。谢谢大卫 (+1)