Given the below code, how would you update a name label IBOutlet?

class PreferencesVC: UIViewController {
var profile: Profile!
func updateViews() {
// Update nameLbl
}
}

class Profile {
var name: String?

func update(name newName: String) {
name = newName
}
}

Question

Given the below code, how would you update a name label IBOutlet?

class PreferencesVC: UIViewController {
    var profile: Profile!
    func updateViews() {
        // Update nameLbl
    }
}



class Profile {
    var name: String?
    
    func update(name newName: String) {
        name = newName
    }
}

Anónimo · Accepted Answer

He was looking for me to catch potential retain cycles and also make sure UI things were only happening on the main thread.

We eventually got into a discussion on where the best place to put Dispatch.main.  I think I preferred to go to the main thread as close to the actual UILabel objects as possible, while he preferred to split it up across data-model/view lines (i.e. the “self.onUpdate” line in the Profile object). In other words, prepare to defend your architecture decisions.

class PreferencesVC: UIViewController {
    var profile: Profile!
    
    func updateViews() {
               Dispatch.main(
          self.nameLbl.text = profile.name
       )
    }
    
    func viewDidLoad() {
        updateViews()
    
        self.profile.onUpdate = { [weak self] in 
           self.updateViews()
        }
    }
}

class Profile {
    var name: String?
    
    var onUpdate : (() -> ())?
    
    func update(name newName: String) {
    
        let request = // ...
    
        request.fire(newName, completion: { validName in 
            name = validName
            self.onUpdate?()
        }
    }
}

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