问题
The code below was working fine before Swift 4.2:
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(notification:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
When I click the 'Fix' option, it becomes:
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(notification:)), name: NSNotification.Name.UIResponder.keyboardWillShowNotification, object: nil)
But it is still marked an error. Here is the explanation:
Type 'NSNotification.Name' has no member 'UIResponder'
And then I tried to delete 'UIResponder':
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(notification:)), name: NSNotification.Name.
...but I don't know how should I complete it.
回答1:
The correct form is:
UIResponder.keyboardWillShowNotification
...so, your code becomes:
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(notification:)), name: UIResponder.keyboardWillShowNotification)
This is a known issue with Xcode 10. Automatic Fix-it is not working correctly for Swift 4.2 when it comes to correcting notification names.
In Swift 4.2, lots of Notification.Name instances became instance variables in other classes. For example, keyboardWillShowNotification is now an instance variable of UIResponder.
回答2:
For someone else out there, I was building (what I thought was) a UI-Independent class and did not import UIKit.
Nothing worked until I added at the top of my file, this:
#import UIKit
It appears some notifications (those in UIApplication, UIResponder etc..) may have been refactored into UIKIt.
来源：https://stackoverflow.com/questions/52466147/error-with-notification-names-while-converting-code-to-swift-4-2