iOS CAKeyframeAnimation关键帧动画用法

用法1​ Value方式

一个数组，提供了一组关键帧的值， 当使用path的 时候 values的值自动被忽略。

//创建动画对象

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

//设置value

NSValue *value1=[NSValuevalueWithCGPoint:CGPointMake(100, 100)];

NSValue *value2=[NSValuevalueWithCGPoint:CGPointMake(200, 100)];

NSValue *value3=[NSValuevalueWithCGPoint:CGPointMake(200, 200)];

NSValue *value4=[NSValuevalueWithCGPoint:CGPointMake(100, 200)];

NSValue *value5=[NSValuevalueWithCGPoint:CGPointMake(100, 300)];

NSValue *value6=[NSValuevalueWithCGPoint:CGPointMake(200, 400)];

animation.values=@[value1,value2,value3,value4,value5,value6];

//重复次数 默认为1

animation.repeatCount=MAXFLOAT;

//设置是否原路返回默认为NO

animation.autoreverses = YES;

//设置移动速度，越小越快

animation.duration = 4.0f;

 animation.removedOnCompletion = NO;

animation.fillMode = kCAFillModeForwards;

animation.timingFunction=[CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseInEaseOut];

animation.delegate=self;

//给这个view加上动画效果

[moveView.layer addAnimation:animation forKey:nil];

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####### 用法2​、 Path方式​

这是一个 CGPathRef 对象，默认是空的，当我们创建好CAKeyframeAnimation的实例的时候，可以通过制定一个自己定义的path来让 某一个物体按照这个路径进行动画。这个值默认是nil 当其被设定的时候 values 这个属性就被覆盖

//创建动画对象

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

//创建一个CGPathRef对象，就是动画的路线

CGMutablePathRef path = CGPathCreateMutable();

//自动沿着弧度移动

CGPathAddEllipseInRect(path, NULL, CGRectMake(150, 200, 200, 100));

//设置开始位置

CGPathMoveToPoint(path,NULL,100,100);

//沿着直线移动

CGPathAddLineToPoint(path,NULL, 200, 100);

CGPathAddLineToPoint(path,NULL, 200, 200);

CGPathAddLineToPoint(path,NULL, 100, 200);

CGPathAddLineToPoint(path,NULL, 100, 300);

CGPathAddLineToPoint(path,NULL, 200, 400);

   //沿着曲线移动

CGPathAddCurveToPoint(path,NULL,50.0,275.0,150.0,275.0,70.0,120.0);

CGPathAddCurveToPoint(path,NULL,150.0,275.0,250.0,275.0,90.0,120.0);

CGPathAddCurveToPoint(path,NULL,250.0,275.0,350.0,275.0,110.0,120.0);

CGPathAddCurveToPoint(path,NULL,350.0,275.0,450.0,275.0,130.0,120.0);

** animation.path=path;**

CGPathRelease(path);

animation.autoreverses = YES;

animation.repeatCount=MAXFLOAT;

animation.removedOnCompletion = NO;

animation.fillMode = kCAFillModeForwards;

animation.duration = 4.0f;

animation.timingFunction=[CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseInEaseOut];

animation.delegate=self;

//调用
** [moveView.layer addAnimation:animation forKey:nil];**