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我一直在尝试做CALayer动画。但是在动画之后它又恢复了。我找到了一些解决方案removedOnCompleteion = YES，fill mode = kCAFillModesForwards但没有一个对我有帮助。这是代码。需要一点帮助，谢谢。

  void(^ myblock)(NSDictionary *) = ^(NSDictionary *dict){

        NSMutableArray *arrOfPt=       [dict objectForKey:@"Path"];

        CGPoint p1 = [[arrOfPt objectAtIndex:0] CGPointValue];

        CGPoint cp1 = [[arrOfPt objectAtIndex:1] CGPointValue];

//        CGPoint cp1 = [[arrOfPt objectAtIndex:1] CGPointValue];
        CGPoint cp2 = [[arrOfPt objectAtIndex:2] CGPointValue];
        CGPoint p2 = [[arrOfPt objectAtIndex:3] CGPointValue];

        NSMutableArray *arrayTime =  [dict objectForKey:@"Time"];
        CGFloat time = [[arrayTime objectAtIndex:0] floatValue];

        pointerLayer.opacity = 1;
//        NSArray *oneObjPt = [NSArray arrayWithObjects:[arrOfPt objectAtIndex:0],[arrOfPt lastObject],nil];
        //         NSArray *oneObjTime = [NSArray arrayWithObjects:[arrayTime objectAtIndex:0],[arrayTime lastObject],nil];
//        NSArray *oneObjTime = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0],[NSNumber numberWithFloat:1.0],nil];
        CAKeyframeAnimation *keyFrameAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];

//        [keyFrameAnimation setCalculationMode:kCAAnimationPaced];
        keyFrameAnimation.duration = 1;
        keyFrameAnimation.removedOnCompletion = NO;
        [keyFrameAnimation setFillMode:kCAFillModeForwards];

        CGMutablePathRef fpath = CGPathCreateMutable();

        CGPathMoveToPoint(fpath, NULL, p1.x, p1.y);
        CGPathAddCurveToPoint(fpath, NULL, cp1.x, cp1.y, cp2.x, cp2.y, p2.x, p2.y);
        keyFrameAnimation.path = fpath;

        [pointerLayer addAnimation:keyFrameAnimation forKey:@"pos"];
        CGPoint newLoc = pointerLayer.position;// this is just to verify the layer's location
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2 回答 2

1

我找到了一些解决方案，例如 removedOnCompleteion = YES 和填充模式 = kCAFillModesForwards

这些不是解决方案。

CGPoint newLoc = pointerLayer.position;

那不会有任何好处；添加动画实际上并不会改变位置。动画稍后发生。

我不完全确定你在追求什么，但它可能会帮助你阅读我对 Core Animation 的解释。动画只是一种幻觉；这是一个使用“表示层”玩的游戏。您可以将实际图层移动到动画之后的位置，并添加看起来会使其移动的动画。

我提供了一种公式化的方法来确保您的核心动画能够将您带到您想去的地方：

http://www.aeth.com/iOSBook/ch17.html#_using_a_cabasicanimation

于 2013-04-04T13:34:24.167 回答
0

我似乎无法重新创建这个 - 我使用了一些测试数据：

CGPoint cp1 = CGPointMake(0, 0);
CGPoint cp2 = CGPointMake(100, 100);
CGPoint cp3 = CGPointMake(85, 150);
CGPoint cp4 = CGPointMake(50, 50);
CGFloat time = 2.0f;
CAKeyframeAnimation *keyFrameAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
keyFrameAnimation.duration = time;
keyFrameAnimation.removedOnCompletion = NO;
[keyFrameAnimation setFillMode:kCAFillModeForwards];

CGMutablePathRef fpath = CGPathCreateMutable();

CGPathMoveToPoint(fpath, NULL, cp1.x, cp1.y);
CGPathAddCurveToPoint(fpath, NULL, cp2.x, cp2.y, cp3.x, cp3.y, cp4.x, cp4.y);
keyFrameAnimation.path = fpath;
[testView.layer addAnimation:keyFrameAnimation forKey:@"pos"];
CFRelease(fpath);

输出：

http://glassofcocoa.com/code/AnimationTest.mp4

可能您在数组中的一个点可能是起始位置？

于 2013-04-04T13:26:37.637 回答