CAKeyframeAnimation动画

一、Value方式

代码如下：

- (void)viewDidLoad {
    [super viewDidLoad];


    //TODO:Value方式
    CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    animation.delegate = self;

    /**设置移动的路径的点集合**/
    NSValue *value1=[NSValue valueWithCGPoint:CGPointMake(100, 100)];
    NSValue *value2=[NSValue valueWithCGPoint:CGPointMake(200, 100)];
    NSValue *value3=[NSValue valueWithCGPoint:CGPointMake(200, 200)];
    NSValue *value4=[NSValue valueWithCGPoint:CGPointMake(100, 200)];
    NSValue *value5=[NSValue valueWithCGPoint:CGPointMake(100, 300)];
    NSValue *value6=[NSValue valueWithCGPoint:CGPointMake(200, 400)];
    animation.values = @[value1,value2,value3,value4,value5,value6];

    /**设置重复次数**/
    animation.repeatCount = MAXFLOAT;

    /**设置是否原路返回**/
    animation.autoreverses = YES;

    /**设置移动的速度，值越小，速度越快**/
    animation.duration = 6.0f;

    /**动画完成之后是否移除？**/
    animation.removedOnCompletion = NO;

    /**动画的填充样式**/
    animation.fillMode = kCAFillModeForwards;

    /**定义动画的节奏样式**/
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
    [self.imageView.layer addAnimation:animation forKey:nil];
}

#pragma mark 动画已经结束，可以在这里做一些处理，比如清除图片所占内存
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag
{

}

二、Path方式

    //TODO:Path方式
    CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    animation.delegate = self;

    /**创建动画的路线对象，即CGPathRef对象**/
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathAddEllipseInRect(path, NULL, CGRectMake(100, 150, 200, 250));
    CGPathMoveToPoint(path, NULL, 10, 100);

    /**路径->直线**/
    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);

    /**路径->曲线**/
    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.fillMode = kCAFillModeForwards;
    animation.duration = 30.0f;
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    [self.imageView.layer addAnimation:animation forKey:nil];