CAReplicatorLayer 的主要作用是生成相似的图层。

    先来一个生成一串正方形围成的圈圈的图片，代码比较简单，如下：

////  CAReplicatorLayerViewController.m//  iOSanimation////  Created by biyabi on 15/12/1.//  Copyright © 2015年 caijunrong. All rights reserved.//#import "CAReplicatorLayerViewController.h"@interface CAReplicatorLayerViewController ()@property (nonatomic, strong) UIView *GView;@end@implementation CAReplicatorLayerViewController- (void)viewDidLoad {    [super viewDidLoad];    [self.view setBackgroundColor:[UIColor groupTableViewBackgroundColor]];        CAReplicatorLayer *replicator = [CAReplicatorLayer layer];    replicator.frame = self.GView.bounds;    [self.view.layer addSublayer:replicator];        replicator.instanceCount = 10;        //旋转方向和角度主要还是由自己决定    CATransform3D transform = CATransform3DIdentity;    transform = CATransform3DTranslate(transform, 0, 100, 0);    transform = CATransform3DRotate(transform, M_PI/5, 0, 0, 1);        transform = CATransform3DTranslate(transform, 0, -100, 0);        //    replicator.instanceTransform = transform;    replicator.instanceBlueOffset = -0.1;    replicator.instanceGreenOffset = -0.1;        CALayer *layer = [CALayer layer];    layer.frame = CGRectMake([UIScreen mainScreen].bounds.size.width - 100*2, 100.0f, 100.0f, 100.0f);    layer.backgroundColor = [UIColor whiteColor].CGColor;    [replicator addSublayer:layer];}- (UIView *)GView{    if (!_GView) {        _GView  = [[UIView alloc]initWithFrame:CGRectMake([UIScreen mainScreen].bounds.size.width - 10*2, 94, 10,10)];        [self.view addSubview:_GView];    }    return _GView;}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}/*#pragma mark - Navigation// In a storyboard-based application, you will often want to do a little preparation before navigation- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {    // Get the new view controller using [segue destinationViewController].    // Pass the selected object to the new view controller.}*/@end

    倒影更简单了：

////  ReView.m//  iOSanimation////  Created by biyabi on 15/12/1.//  Copyright © 2015年 caijunrong. All rights reserved.//#import "ReView.h"@implementation ReView- (instancetype)initWithFrame:(CGRect)frame{    if (self = [ super initWithFrame:frame]) {                UIImageView *imageView = [[UIImageView alloc]initWithFrame:frame];        [self addSubview:imageView];        [imageView setImage:[UIImage imageNamed:@"icon_weibo"]];                //做倒影        CAReplicatorLayer *layer = (CAReplicatorLayer *)self.layer;        layer.instanceCount = 2;                CATransform3D transform = CATransform3DIdentity;        CGFloat verticalOffset = frame.size.height + 2;        transform = CATransform3DTranslate(transform, 0, verticalOffset, 0);        transform = CATransform3DRotate(transform, M_PI, 1, 0, 0);//        transform = CATransform3DScale(transform, 1, 0 , 0);        layer.instanceTransform = transform;            //reduce alpha of reflection layer        layer.instanceAlphaOffset = -0.6;                            }    return self;}+ (Class)layerClass{    return [CAReplicatorLayer class];}@end