1.首先在storyboard上放一个redView。
2.控制器里代码实现。
#import "ViewController.h"
@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.
CAReplicatorLayer *repL = [CAReplicatorLayer layer];
repL.frame = _redView.bounds;
[_redView.layer addSublayer:repL];
CALayer *layer = [CALayer layer];
layer.transform = CATransform3DMakeScale(0, 0, 0);
layer.position = CGPointMake(_redView.bounds.size.width / 2, 20);
layer.bounds = CGRectMake(0, 0, 10, 10);
layer.backgroundColor = [UIColor greenColor].CGColor;
[repL addSublayer:layer];
// 设置缩放动画
CABasicAnimation *anim = [CABasicAnimation animation];
anim.keyPath = @"transform.scale";
anim.fromValue = @1;
anim.toValue = @0;
anim.repeatCount = MAXFLOAT;
CGFloat duration = 1;
anim.duration = duration;
[layer addAnimation:anim forKey:nil];
int count = 20;
CGFloat angle = M_PI * 2 / count;
// 设置子层总数
repL.instanceCount = count;
repL.instanceTransform = CATransform3DMakeRotation(angle, 0, 0, 1);
repL.instanceDelay = duration / count;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
