和layer有关的东西

self.myView=[[UIView alloc]initWithFrame:CGRectMake(50, 50, 200, 200)];
    self.myView.backgroundColor=[UIColor redColor];
    [self.view addSubview:self.myView];

    //加一张图片
    UIImageView *imv=[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"3.png"]];
    imv.frame=self.myView.bounds;
    [self.myView addSubview:imv];

    //设置圆角
    self.myView.layer.cornerRadius=25;
    //描边粗细
    self.myView.layer.borderWidth=20;
    //描边颜色(需要装换类型后面加.CGcolor)
    self.myView.layer.borderColor=[UIColor cyanColor].CGColor;
    //阴影颜色
    self.myView.layer.shadowColor=[UIColor orangeColor].CGColor;
    //阴影偏移
    self.myView.layer.shadowOffset=CGSizeMake(10, 10);
    //阴影透明度(是必须设置的)
    self.myView.layer.shadowOpacity=0.5;
    //模糊程度(阴影的模糊程度)
    self.myView.layer.shadowRadius=10;




    //设置锚点
    self.myView.layer.anchorPoint=CGPointMake(0.5, 0.5);

    //打印position
    NSLog(@"position:%@",NSStringFromCGPoint(self.myView.layer.position));
    //打印锚点
    NSLog(@"锚点:%@",NSStringFromCGPoint(self.myView.layer.anchorPoint));