IOS第18天(2,CALayer自定义图层）

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    // 创建一个图层
    CALayer *layer = [CALayer layer];

    // 设置尺寸
    layer.bounds = CGRectMake(, , , );

    // 设置位置
    layer.position = CGPointMake(, );

    // 设置颜色
    layer.backgroundColor = [UIColor redColor].CGColor;

    // 设置内容
    layer.contents = (__bridge id)[UIImage imageNamed:@"阿狸头像"].CGImage;

    [self.view.layer addSublayer:layer];

}