CAKeyPathAnimation

最新推荐文章于 2018-12-24 08:35:00 发布

原创最新推荐文章于 2018-12-24 08:35:00 发布 · 398 阅读

0 ·

CC 4.0 BY-SA版权

iOS 专栏收录该内容

34 篇文章

订阅专栏

本文介绍了一个iOS应用中实现的视图动画效果。通过使用Core Animation的CAKeyframeAnimation，文章详细展示了如何创建循环动画路径并应用于UIView。此外，还介绍了如何通过设置关键帧动画的属性来控制动画的位置变化。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

@property (weak, nonatomic) IBOutlet UIView *redView;

@end

@implementation HMViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

   // Do any additional setup after loading the view, typically from a nib.
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];

    // 设置动画属性
    anim.keyPath = @"position";


    UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, 200, 200)];

    anim.path = path.CGPath;

    anim.duration = 2;

    // 取消反弹
    anim.removedOnCompletion = NO;

    anim.fillMode = kCAFillModeForwards;

    anim.repeatCount = MAXFLOAT;

    [_redView.layer addAnimation:anim forKey:nil];

}
- (void)value
{
    CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];

    // 设置动画属性
    anim.keyPath = @"position";

    NSValue *v1 = [NSValue valueWithCGPoint:CGPointZero];
    NSLog(@"cgpointZero = %@", CGPointZero);

    NSValue *v2 = [NSValue valueWithCGPoint:CGPointMake(160, 160)];

    NSValue *v3 = [NSValue valueWithCGPoint:CGPointMake(270, 0)];

    anim.values = @[v1,v2,v3];

    anim.duration = 2;

    [_redView.layer addAnimation:anim forKey:nil];
}