iOS：UIView的CALayer基本演练

    //添加button
    UIButton *button = [[UIButton alloc]init];
    //设置frame
    button.frame = CGRectMake(100, 100, 100, 100);

     //背景色

     button.layer.backgroundColor = [[UIColor redColor]CGColor];

     [self.view addSubview:button];

    //设置圆角半径
    button.layer.cornerRadius = 50.0;

    //设置边框(颜色、边宽)
    button.layer.borderColor = [[UIColor greenColor]CGColor];
    button.layer.borderWidth = 2.0;

    //设置阴影(颜色、偏移量、透明度、半径)
    button.layer.shadowColor = [[UIColor purpleColor]CGColor];
    button.layer.shadowOffset = CGSizeMake(0, 0);
    button.layer.shadowOpacity = 1.0;
    button.layer.shadowRadius = 20.0;

    //设置内容
    button.layer.contents = (id)[[UIImage imageNamed:@"2.png"] CGImage];

    //设置平移(每一个轴平移长度)
    button.layer.transform = CATransform3DMakeTranslation(10, 300, 0.0);
    //恢复平移
    //button.layer.transform = CATransform3DIdentity;

    //设置旋转(旋转角度、x轴、y轴、z轴)
    button.layer.transform = CATransform3DMakeRotation(M_PI, 1, 0, 0);
    //恢复旋转
    //button.layer.transform = CATransform3DIdentity;

    //设置放缩(每一个轴方向放缩大小系数)
    button.layer.transform = CATransform3DMakeScale(2, 2, 2);
    //恢复放缩
    //button.layer.transform = CATransform3DIdentity;