首先它说
"UIApplicationIdentinterBackground"已重命名为
当我把它点上时,它说
输入"通知".Name'(又名'NSNotification.Name')没有成员
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()
}
}
}