Xcode轻击手势导致错误

Question

I created two views in Xcode using the hierarchical view layout. I initially created a button on the first page (PlaylistMasterViewController) which activates the segue method to transition to the next page in the hierarchy (PlaylistDetailViewController), which worked just fine. I then deleted the button, and added a tap gesture to one of the UIImage view elements in the masterViewController and deleted the button. I created the action outlet of the touch gesture to activate the segue and made sure to delete all of the uses of the button in my code, yet this error is thrown once right after the splash screen loads (run time). Any ideas what might be causing this?

Answer 1

In your storyboard check your PlaylistMasterViewController for a connected outlet named showPlaylistDetail with a little while exclamation mark next to it. Then hit the 'x' and clear that outlet connection.

It's most likely some outlet you previously connected and later removed from your code.

The image below is just an example to show you what it would look like.

Answer 2

最常见-从ViewController到情节提要中已删除的按钮都有出口

Answer 3

You might have deleted the button but something in the view itself may still be referencing it. As the view is loaded at runtime when you try to bring up the view it may have UIButton connected to an outlet that no longer exists.

Open the view in Interface Builder and make all the ui elements in that view are properly wired up and not referencing a non-existent IBOutlet. If there is a problem you'll see a yellow warning icon to indicate a problem.