我正在尝试创建一条贝塞尔曲线路径，如下图中的instagram三角形，但我一定是做错了什么。贝塞尔路径不显示!-(void)viewDidLoad{[superviewDidLoad];//Doanyadditionalsetupafterloadingtheview.}-(void)viewDidLayoutSubviews{[superviewDidLayoutSubviews];[selfdrawTriangle];}-(IBAction)closeButton:(UIButton*)sender{[selfdismissViewControllerAnimated:YEScom