CAKeyframeAnimation：沿路径移动UIView

Question

CAKeyframeAnimation：沿路径移动UIView

5

这是我移动UIview的代码，将其向下移动30px，然后向上移动到y = 10，但是此动画无法正常工作。这是我第一次尝试创建CAKeyframeAnimation，所以有人可以帮我正确编写它吗？另外，我不想让我的对象返回原始位置，而是停留在动画结束的位置。

CGMutablePathRef thePath = CGPathCreateMutable();
    CGPathAddRect(thePath, NULL, CGRectMake(self.logo.frame.origin.x, self.logo.frame.origin.y, self.logo.frame.size.width, self.logo.frame.size.height));
    CGPathAddRect(thePath, NULL, CGRectMake(self.logo.frame.origin.x, self.logo.frame.origin.y-30, self.logo.frame.size.width, self.logo.frame.size.height));
    CGPathAddRect(thePath, NULL, CGRectMake(self.logo.frame.origin.x, 100, self.logo.frame.size.width, self.logo.frame.size.height));


    CAKeyframeAnimation* AniLoc = [CAKeyframeAnimation animationWithKeyPath:@"frame"];
    AniLoc.path = thePath;
    AniLoc.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    AniLoc.keyTimes= [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0f],
                      [NSNumber numberWithFloat:0.3f],
                      [NSNumber numberWithFloat:1.0f],nil];
    AniLoc.duration = 2.0;

    CFRelease(thePath);

    [self.logo.layer addAnimation:AniLoc forKey:nil];

- Ayaz Alavi

它以什么方式“不工作”？ - jrturton

动画没有移动任何东西。 - Ayaz Alavi

1个回答

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- Alexander · Accepted Answer

我不太确定为什么您的方法不起作用，但我可以建议另一种解决方案。您可以更改位置键以移动UIView，而不是驱动框架：

    CGMutablePathRef thePath = CGPathCreateMutable();
    CGPathMoveToPoint(thePath, NULL, self.logo.frame.origin.x, self.logo.frame.origin.y); // initial point, notice the function
    CGPathAddLineToPoint(thePath, NULL, self.logo.frame.origin.x - 30, self.logo.frame.origin.y);
    CGPathAddLineToPoint(thePath, NULL, 100, self.logo.frame.origin.y);

    CAKeyframeAnimation* AniLoc = [CAKeyframeAnimation animationWithKeyPath:@"position"]; // notice key change

    // rest is the same
    AniLoc.path = thePath;
    AniLoc.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    AniLoc.keyTimes= [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0f],
                      [NSNumber numberWithFloat:0.3f],
                      [NSNumber numberWithFloat:1.0f],nil];
    AniLoc.duration = 2.0;

    CFRelease(thePath);

    [self.logo.layer addAnimation:AniLoc forKey:nil];

希望这能帮到你。