1.storyboard上放一个RepView，在RepView上面放一个UIImageView,大小都和图片大小相同。
2.在RepView.m文件中加入下列方法

// 设置控件主层的类型
+ (Class)layerClass
{
    return [CAReplicatorLayer class];
}

3.在控制器中加入如下代码

#import "ViewController.h"
#import "RepView.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet RepView *repView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    CAReplicatorLayer *layer =  (CAReplicatorLayer *)_repView.layer;
    
    layer.instanceCount = 2;
    
    
    CATransform3D transform = CATransform3DMakeTranslation(0, _repView.bounds.size.height, 0);
    // 绕着X轴旋转
    transform = CATransform3DRotate(transform, M_PI, 1, 0, 0);
    
    
    // 往下面平移控件的高度
    layer.instanceTransform = transform;
    
    // 透明度、红绿蓝的色差
    layer.instanceAlphaOffset = -0.1;
    layer.instanceBlueOffset = -0.1;
    layer.instanceGreenOffset = -0.1;
    layer.instanceRedOffset = -0.1;

}