类型 'Notification.Name'（又名 'NSNotification.Name'）没有成员 'UIApplication'

Question

首先它说

'UIApplicationDidEnterBackground' has been renamed to 'UIApplication.didEnterBackgroundNotification'

当我点它时，它说

Type 'Notification.Name' (aka 'NSNotification.Name') has no member 'UIApplication'

func listenForBackgroundNotification() {
    observer = NotificationCenter.default.addObserver(forName: Notification.Name.UIApplicationDidEnterBackground, object: nil, queue: OperationQueue.main) { [weak self] _ in
        if let weakSelf = self {
            if weakSelf.presentedViewController != nil {
                weakSelf.dismiss(animated: true, completion: nil)
            }
            weakSelf.descriptionTextView.resignFirstResponder()

        }
    }
}

Answer 1

改变

forName: Notification.Name.UIApplicationDidEnterBackground

至

forName: UIApplication.didEnterBackgroundNotification

Answer 2

类型 'NSNotification' 错误在 swift4.2

中没有成员 'UIApplication'

NotificationCenter.default.addObserver(self, selector:#selector(handleNotification), name: NSNotification.Name.UIApplicationDidEnterBackground, object: nil)

需要相应更改

NotificationCenter.default.addObserver(self, selector:#selector(handleNotification), name: UIApplication.didEnterBackgroundNotification, object: nil)

Answer 3

如果 UIApplicaiton.didEnterBackgroundNotificaiton 不起作用，请尝试 .UIApplicationDidEnterBackground。

Answer 4

Xcode 11 , swift 5

UIApplication.didBecomeActiveNotification

Answer 5

Xcode 11.4.1, Swift 5

有完全相同的问题。我的问题是我没有在自定义 class

中导入 UIKit

import UIKit

然后我能够实现以下内容：

name: UIApplication.didEnterBackgroundNotification

Answer 6

类似错误'UIApplicationDidChangeStatusBarOrientation' has been renamed to 'UIApplication.didChangeStatusBarOrientationNotification'

解决Swift中的这个错误 5

你应该改变你的称呼方式：

NotificationCenter.default.addObserver(self, selector: #selector(self.configureActivityIndicatorPosition), name: .UIApplicationDidChangeStatusBarOrientation, object: nil)

到

NotificationCenter.default.addObserver(self, selector: #selector(self.configureActivityIndicatorPosition), name: UIApplication.didChangeStatusBarOrientationNotification, object: nil)

类型 'Notification.Name'（又名 'NSNotification.Name'）没有成员 'UIApplication'

Type 'Notification.Name' (aka 'NSNotification.Name') has no member 'UIApplication'

notificationcenter

swift