我有一个在点击按钮时弹出的注册表单。我的目标是在弹出此模式时隐藏状态栏。这是我的代码:-(IBAction)tappedJoinButton:(id)sender{if(![PFUsercurrentUser]){PFSignUpViewController*signUpViewController=[[PFSignUpViewControlleralloc]init];[signUpViewControllersetDelegate:self];//Setourselvesasthedelegate//Presentthesignupviewcontroller[selfpresen

我正在尝试XCode6.3beta和Swift1.2这里的as!是什么意思？overridefuncprepareForSegue(segue:UIStoryboardSegue,sender:AnyObject?){ifsegue.identifier==signUpViewId{varsignUpView=segue.destinationViewControlleras!SignUpViewController}} 最佳答案 这意味着，如果segue.destinationViewController是一个SignUpView