OC动画：CAKeyframeAnimation

 //    方法一 用法1? Value方式
    //创建动画对象
    
    CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    
    //设置value
    
    NSValue *value1=[NSValue valueWithCGPoint:CGPointMake(100, 100)];
    
    NSValue *value2=[NSValue valueWithCGPoint:CGPointMake(200, 100)];
    
    NSValue *value3=[NSValue valueWithCGPoint:CGPointMake(100, 200)];
    
    NSValue *value4=[NSValue valueWithCGPoint:CGPointMake(200, 200)];
    
    NSValue *value5=[NSValue valueWithCGPoint:CGPointMake(100, 300)];
    
    NSValue *value6=[NSValue valueWithCGPoint:CGPointMake(200, 300)];
    
    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不
    
//    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=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    
    animation.delegate=self;
    
    //给这个view加上动画效果
    
    [redView.layer addAnimation:animation forKey:nil];

CAKeyframeAnimation *keyframeAnimation=[CAKeyframeAnimation animationWithKeyPath:@"position"];
    //    创建一个CGPathRef对象，就是动画的路线
    CGMutablePathRef path = CGPathCreateMutable();
    //    设置开始位置
    CGPathMoveToPoint(path, NULL, redView.layer.position.x-40, redView.layer.position.y+40);//移动到起始点
    //    沿着路径添加四曲线点移动
    CGPathAddQuadCurveToPoint(path, NULL, 100, 100, self.view.frame.size.width, 0);
    keyframeAnimation.path = path;
    keyframeAnimation.delegate = self;
    CGPathRelease(path);
    keyframeAnimation.duration = 7;
    [redView.layer addAnimation:keyframeAnimation forKey:@"KCKeyframeAnimation_Position"];