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🙈 Adds viewWillAppearFirstTime(_:) and viewDidAppearFirstTime(_:) to UIViewController

License: MIT License

Ruby 12.55% Swift 63.90% Objective-C 23.55%

viewdidappearfirsttime's Introduction

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
    }
}