Core Animation实例2-活动指示器（CAReplicatorLayer复制层）

来源：互联网发布：tensorflow 下载编辑：程序博客网时间：2024/05/21 06:54

demo

这里写图片描述
可以利用CAReplicatorLayer复制层给View添加一直活动状态的动画，并且可以设置复制时间与动画时间的比值，设定显示效果，比如说上图：复制时间是动画时间的三倍，显示三个动画效果
直接上代码

@interface ViewController ()@property (weak, nonatomic) IBOutlet UIView *redView;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    // 创建复制层    CAReplicatorLayer *repL = [CAReplicatorLayer layer];    repL.frame = _redView.bounds;    CGFloat count = 30;    CGFloat angle = M_PI * 2 / count;    repL.instanceCount = count;    repL.instanceTransform = CATransform3DMakeRotation(angle, 0, 0, 1);    // 设置复制延迟动画时间 = 动画时间 / 总的个数    repL.instanceDelay = 3 / count;    [_redView.layer addSublayer:repL];    CGFloat w = 15;    // 绿色    CALayer *greenLayer = [CALayer layer];    greenLayer.transform = CATransform3DMakeScale(0, 0, 0);    greenLayer.position = CGPointMake(_redView.bounds.size.width * 0.5, w);    greenLayer.bounds = CGRectMake(0, 0, w, w);    greenLayer.backgroundColor = [UIColor greenColor].CGColor;    [repL addSublayer:greenLayer];    CABasicAnimation *anim = [CABasicAnimation animation];    anim.keyPath = @"transform.scale";    anim.fromValue = @1;    anim.toValue = @0;    anim.repeatCount = MAXFLOAT;    anim.duration = 1;    [greenLayer addAnimation:anim forKey:nil];}

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