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我正在重写我的问题，因为它被修改了很多，现在它变成了一个新问题。

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    location = [touch locationInView:self.view];
    CGPoint prevLocation = [touch previousLocationInView:self.view];
    CGFloat distanceFromPrevious = [self distanceBetweenPoints:location :prevLocation];
    NSTimeInterval timeSincePrevious = event.timestamp - self.previousTimestamp;
    if (locArray == NULL) {
        locArray = [[NSMutableArray alloc] init];
    }
    [locArray addObject:[NSValue valueWithCGPoint:prevLocation]];
    CGFloat speed = distanceFromPrevious/timeSincePrevious;
    self.previousTimestamp = event.timestamp;

    //NSLog(@"speed %f | time %f", speed, timeSincePrevious);

}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    CALayer *animLayer = ball.layer;
    animLayer.bounds = ball.bounds;
    animLayer.position = CGPointMake(self.view.frame.size.width/2, 0);
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, self.view.frame.size.width/2, 380);

    for (int i=0; i<[locArray count]; i++) {
        NSValue *val = [locArray objectAtIndex:i];
        CGPoint p = [val CGPointValue];
        CGPathAddLineToPoint(path, NULL, p.x, p.y);

        NSLog(@"Points %f %d", p.y, i);
    }
    CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"path"];
    animation.duration = 4.0f;
    animation.path = path;
    animation.removedOnCompletion = NO;
    CGPathRelease(path);

    [animLayer addAnimation:animation forKey:@"path"];
    locArray = nil;

}

我正在尝试基于 UITTouch touchesMoved 事件捕获的名为 ball 的视图类。LocArray 保存移动触摸的 CGPoint 值。我试图将这些值放入我的 CGMutablePathRef 中。然后，我尝试在由用户手指移动输入创建的路径上为球设置动画。

我不能让我的动画工作。它有什么问题？

编辑：

我改变了 ：

CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];

animationWithKeyPath 值现在是位置，现在它正在工作:)

我有一些小问题，但我已经解决了。

但我的新问题是：

完成动画并停止后，球视图正在返回其起点。

我希望它停留在路径的最后一点。

解决方案：我终于找到了解决方案。

我添加了一个 CGPoint finalPoint = [locArray count]-1 值。然后，

animLayer.position = finalPoint;

这一切都解决了。现在球停留在 touchesMoved 事件捕获的手指触摸的最终位置。

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