ViewDidAppearFirstTime

The library lets you know whether your UIViewController subclasses' viewWillAppear and viewDidAppear are being called for the first time. It adds the following methods:

• viewWillAppearFirstTime(_:): called when viewWillAppear the first time.
• viewWillAppearAgain(_:): called when viewWillAppear the second time on.
• viewDidAppearFirstTime(_:): called when viewDidAppear the first time.
• viewDidAppearAgain(_:): called when viewDidAppear the second time on.

Before:

import UIKit

class ViewController: UIViewController {

    var firstTime = true

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        if firstTime {
            //viewWillAppear first time
        } else {
            //viewWillAppear again
        }
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        if firstTime {
            //viewDidAppear first time
            firstTime = false
        } else {
            //viewDidAppear again
        }
    }
}

After:

import UIKit
import ViewDidAppearFirstTime

//in AppDelegate: UIViewController.activateFirstAppearance()

class ViewController: UIViewController, FirstAppearance {

    func viewWillAppearFirstTime(_ animated: Bool) {
        //viewWillAppear first time
    }

    func viewWillAppearAgain(_ animated: Bool) {
        //viewWillAppear again
    }

    func viewDidAppearFirstTime(_ animated: Bool) {
        //viewDidAppear first time
    }

    func viewDidAppearAgain(_ animated: Bool) {
        //viewDidAppear again
    }
}

Installation

pod 'ViewDidAppearFirstTime'

License

ViewDidAppearFirstTime is available under the MIT license. See the LICENSE file for more info.