@interface CAReplicatorLayer : CALayer@property NSInteger instanceCount;
//复制的个数
@property BOOL preservesDepth;
//这是一个bool值，默认为No，如果设为Yes，将会具有3维透视效果
@property CFTimeInterval instanceDelay;
//复制后的layer相比原来的距离
@property CATransform3D instanceTransform;
//复制layer的坐标系/方向偏转
@property(nullable) CGColorRef instanceColor;@property float instanceRedOffset;
@property float instanceGreenOffset;
@property float instanceBlueOffset;
@property float instanceAlphaOffset;@end

#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];//创建一个红色的圆形CALayerCALayer * layer       = [CALayer layer];layer.bounds          = CGRectMake(0, 0, 30, 30);layer.position        = CGPointMake(self.view.center.x - 50, self.view.center.y - 50);layer.backgroundColor = [UIColor redColor].CGColor;layer.cornerRadius    = 15;[self.view.layer addSublayer:layer];//创建一个透明度动画CABasicAnimation * animation1 = [CABasicAnimation animationWithKeyPath:@"opacity"];animation1.fromValue          = @(0);animation1.toValue            = @(1);animation1.duration           = 1.5;animation1.autoreverses       = YES;//创建一个缩放动画CABasicAnimation * animation2 = [CABasicAnimation animationWithKeyPath:@"transform.scale"];animation2.toValue            = @(1.5);animation2.fromValue          = @(0.5);animation2.duration           = 1.5;animation2.autoreverses       = YES;//创建一个动画组, 将之前创建的透明度动画和缩放动画加入到这个动画组中CAAnimationGroup * ani = [CAAnimationGroup animation];ani.animations         = @[animation1,animation2];ani.duration           = 1.5;ani.repeatCount        = MAXFLOAT;ani.autoreverses       = YES;//将动画组添加到layer
    [layer addAnimation:ani forKey:nil];CAReplicatorLayer * rec = [CAReplicatorLayer layer];rec.instanceCount       = 3;rec.instanceDelay       = 0.5;rec.instanceTransform   = CATransform3DMakeTranslation(50, 0, 0);[rec addSublayer:layer];[self.view.layer addSublayer:rec];CAReplicatorLayer * rec2 = [CAReplicatorLayer layer];rec2.instanceCount       = 3;rec2.instanceDelay       = 0.5;rec2.instanceTransform   = CATransform3DMakeTranslation(0, 50, 0);[rec2 addSublayer:rec];[self.view.layer addSublayer:rec2];
}@end