CAKeyframeanimation沿着路径移动UIView

Question

这里是我的代码移动UIview 30px然后到y = 10但这个动画不起作用。这是我第一次尝试创建CAKeyframeAnimation，因此任何人都可以帮助我正确写入它。另外我希望我的对象不会回到原来的位置，而是呆在那里动画结束的地方。

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]; 

Answer 1

我不太清楚为什么你的方法不工作，但我可以建议另一种解决方案。 而不是开车到帧，可以改变位置键移动的UIView：

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]; 

我希望这可以帮助你。