应用程序尝试在目标"当前视图控制器"上显示零模态视图控制器

Question

我有一个UIViewControllerxib,当我尝试在它上面呈现一个故事板视图时,它会崩溃.

我用它来呈现它

 UIViewController * buddiesOrFacebook = [self.storyboard   instantiateViewControllerWithIdentifier:@"BuddiesFBFriends"] ;
 [self presentViewController:buddiesOrFacebook animated:YES completion:nil];

Answer 1

检查这些事情

1. 检查viewcontroller的标识符,如果它与storyboard中提到的相同

2. 确保你的好友或朋友不是零.在该行上设置断点,在底部的调试区域上查看对象是否为nil.如果它是零则问题在于故事板连接

3. 如果你的当前viewcontroller没有从storyboard启动,那么得到如下的storyboard对象:

   UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
   UIViewController * buddiesOrFacebook = [storyboard   instantiateViewControllerWithIdentifier:@"BuddiesFBFriends"] ;
   [self presentViewController:buddiesOrFacebook animated:YES completion:nil];
   

Swift更新:

let storyboard = UIStoryboard(name: "MainStoryboard", bundle: nil)
var buddiesOrFacebook = storyboard.instantiateViewControllerWithIdentifier("BuddiesFBFriends")
self.presentViewController(myViewController, animated: true, completion: nil)