nsnotificationcenter

问题 New StackOverflow user here (first time posting, long time lurking w/o an account). Before I begin, these are some previously answered questions that I've found to be helpful but have not completely resolved my issue: How to safely removeObserver (Swift) The right place to call .removeObserver for NSNotificationCenter = Swift deinit()? From these I have constructed a BaseView controller with which to control the behaviour of my app under various circumstances (e.g. an API call to check for

问题 New StackOverflow user here (first time posting, long time lurking w/o an account). Before I begin, these are some previously answered questions that I've found to be helpful but have not completely resolved my issue: How to safely removeObserver (Swift) The right place to call .removeObserver for NSNotificationCenter = Swift deinit()? From these I have constructed a BaseView controller with which to control the behaviour of my app under various circumstances (e.g. an API call to check for

问题 I want to know if the keyboard is fully visible and not if it's in in-between states of presentation. Unfortunately, all the answers use UIKeyboardDidShow , UIKeyboardWillShow , or UIKeyboardWillChangeFrame to check if keyboard is visible. All of these trigger listeners multiple times as the keyboard appears. So I can't use any of them to definitively tell if the keyboard is fully visible. I want to know if the keyboard is fully visible and prevent an action from triggering in my

问题 I'm using AVPlayer and sometimes the player randomly pauses. I'm observing \.timeControlStatus but the only response I get .paused . I'm also observing \.isPlaybackLikelyToKeepUp , \.isPlaybackBufferEmpty , and \.isPlaybackBufferFull but nothing fires for those. However using Notification.Name.AVPlayerItemPlaybackStalled I do get a print statement that says "stalled". Even though \.rate fires when the the player pauses, that fires before .AVPlayerItemPlaybackStalled fires, sometimes \

问题 I'm using AVPlayer and sometimes the player randomly pauses. I'm observing \.timeControlStatus but the only response I get .paused . I'm also observing \.isPlaybackLikelyToKeepUp , \.isPlaybackBufferEmpty , and \.isPlaybackBufferFull but nothing fires for those. However using Notification.Name.AVPlayerItemPlaybackStalled I do get a print statement that says "stalled". Even though \.rate fires when the the player pauses, that fires before .AVPlayerItemPlaybackStalled fires, sometimes \

问题 I'm using AVPlayer and sometimes the player randomly pauses. I'm observing \.timeControlStatus but the only response I get .paused . I'm also observing \.isPlaybackLikelyToKeepUp , \.isPlaybackBufferEmpty , and \.isPlaybackBufferFull but nothing fires for those. However using Notification.Name.AVPlayerItemPlaybackStalled I do get a print statement that says "stalled". Even though \.rate fires when the the player pauses, that fires before .AVPlayerItemPlaybackStalled fires, sometimes \

来源： https://stackoverflow.com/questions/64640556/systemvolumedidchangenotification-never-get-triggered-on-ios-14

来源： https://stackoverflow.com/questions/58818046/how-to-set-addobserver-in-swiftui

来源： https://stackoverflow.com/questions/58818046/how-to-set-addobserver-in-swiftui

问题 With Swift 4.2, getting following error, that was working fine with Swift 4. Type 'NSNotification.Name' has no member 'UITextField' Here is my error code. NotificationCenter.default.addObserver(forName: NSNotification.Name.UITextField.textDidChangeNotification, object: textField, queue: OperationQueue.main) { (notification) in loginAction.isEnabled = textField.text != "" } Full Code: @IBAction func alertWithLogin(){ let alertController = UIAlertController(title: "Please Enter Credential",