No exact matches in call to instance method 'subscribe', Combine Freamwork

Question

When I want to assign a subscriber to a publisher I get this error:

No exact matches in call to instance method 'subscribe'

I write the code in ViewdidLoad:

let textPublisher = NotificationCenter.Publisher(center: .default, name: .labelChange).map({ ($0.object as! String) })
let textsubscriber = Subscribers.Assign(object: textLabel, keyPath: \.text)
textPublisher.subscribe(textsubscriber)

Answer 1

Cast $0.object as optional.

.map({ ($0.object as? String)})

For .subscribe required the same type as .Publisher. But in your case publisher return string and subscriber return optional string so use optional in publisher to fix this issue.