Notification Center - Cannot convert value of type 'Selector' to expected argument type 'String'

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Im learning notification centers right now and am getting this error while trying to register an observer: Cannot convert value of type 'Selector' to expected argument type 'String'

My observer code:

NotificationCenter.addObserver(self, forKeyPath: #selector(receivedMsg), options: Notification.Name("NC1"), context: nil)

Function receivedMsg:

 @objc func receivedMsg() {
print("MSG Received")
}

Working off this tutorial: https://www.hackingwithswift.com/example-code/system/how-to-post-messages-using-notificationcenter

Why am I getting this error and what can I do to fix it? (Swift 4.2)

You'll need to fix two things:

  1. Access an instance of NotificationCenter with NotificationCenter.default

  2. Use the addObserver method signature available on NotificationCenter

Complete code should be something like

NotificationCenter.default.addObserver(self, selector: #selector(receivedMsg), name: Notification.Name("NC1"), object: nil)

Cannot convert value of type 'NSNotification.Name' to expected , You should call the addObserver.. method on default singleton It should be: NotificationCenter.default.addObserver(self, selector: #selector(​positionDidUpdate),  Teams. Q&A for Work. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

You're using the wrong method to add as an observer. You want to use this instead: NotificationCenter.default.addObserver(self, selector: #selector(receivedMsg), name: Notification.Name("NS1"), object: nil)

Cannot convert value of type 'CFRu…, Cannot convert value of type 'CFRunLoopMode!' to expected argument type '​CFString' flags) NotificationCenter.default().post(name: Notification. When a notification is posted to the notification center, and you’re not observing yet, you will obviously miss the notification. By the way, the default property of the NotificationCenter is, in fact, the default notification center (duh!). All system notifications, such as UIKeyboardDidHide and UIKeyboardDidShow, are posted there.

NotificationCenter.default.addObserver(self, selector: #selector(receivedMsg), name: Notification.Name("NC1"), object: nil)

then implement

@objc func receivedMsg() {
    print("MSG Received")
}

Keypath is used for KVO notification

The biggest difference between KVO and NotificationCenter is that KVO tracks specific changes to an object, while NotificationCenter is used to track generic events, like when a button is pressed to post an action.

may get details in this link

Cannot convert value of type 'CFRunLoopMode!' t |Apple , How to fix “Cannot convert value of type 'String' to expected argument type '​Binding<String>'”. Paul Hudson @twostraws October 14th 2019. let b = new_aubio_source(path, 0, hop_size) Cannot convert value of type 'URL?' to expected argument type 'UnsafeMutablePointer<char_t>!' (aka 'ImplicitlyUnwrappedOptional<UnsafeMutablePointer>') I've been trying to figure out how to get the right data type in there but haven't had success yet.

How to fix “Cannot convert value of type 'String' to expected , viewDidLoad() //codeerorr NotificationCenter.default(). Swift Cannot convert value of type 'String' to expected argument type 'NSNotification.Name?' 46. Name let convert: (Notification) -> A} 03:55 Now we can use the struct to describe this playground page notification and how we extract the information we're interested in from that notification. We'll create a new value of the struct and use the memberwise initializer. We'll pass in the notification name and write the convert function. Inside

Using Combine, a declarative Swift API for processing values over time. And Foundation has a number of Combine specific additions including NotificationCenter, how to convert one or both of those types and the associated data with it. If the code you are integrating is asynchronous, then you can't (quite) as easily  Examples of header fields are To, From, Received, and Content-Type. Official header fields are defined in RFC 5322. Unofficial header fields start with X-and are known as X-headers. NotificationMessageText: Any combination of plain text, HTML tags, and keywords: Specified the text to use in a recipient notification message.

cannot implicitly convert type 'System.Xml , System Center Orchestrator - System Center Integrations. Thanks for the suggestion. It is closer but I get the following error. Cannot convert value "('<​UserInputs>. I had the same problem but in my case it was not there since I bought the laptop.press windows + r and type regedit and go to HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Windows\Explorer and there you will see a disable notifications with value 1.Modify the value to 0 and reboot your pc.This solved my problem.Hope this helps you.

Comments
  • You are using the wrong method for adding observer to Notification Center. There is no forKeyPath: argument in the method signature for the observer adding in Notification Center. Use the correct method signature addObserver(_:selector:name:object:)