uiscrollview scrollRectToVisible：方法不起作用

當用戶觸摸屏幕時，我想向下滾動屏幕。我在我的vc中實現了touchesBegan：withEvent：方法，這就是我想出的。uiscrollview scrollRectToVisible：方法不起作用

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ 
     UIScrollView *scrollView=[[UIScrollView alloc]initWithFrame:CGRectMake(0,0,self.view.frame.size.width, self.view.frame.size.height)]; 
     scrollView.contentSize=CGSizeMake(self.view.frame.size.width, self.view.frame.size.height); 
     [self.view addSubview:scrollView]; 
     [scrollView scrollRectToVisible:CGRectMake(0,100,self.view.frame.size.width,self.view.frame.size.height) animated:YES]; 

}

來源

2012-11-05 Mindi Hansen Mende

這如果用戶觸摸由視圖控制器管理的視圖只會工作，即self.view。我猜self.view有一些子視圖，所以他們正在獲取觸摸事件。你想要做什麼？ – hukir