Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
AppDelegate superclass to handle first launch detection and upgrade detection
//
// BaseAppDelegate.swift
//
// Created by Cyril Chandelier on 21/04/2018.
// Copyright © 2018 Cyril Chandelier. All rights reserved.
//
import UIKit
class BaseAppDelegate: UIResponder, UIApplicationDelegate {
// MARK: - Dependencies
lazy var bundle: Bundle = Bundle.main
lazy var userDefaults: UserDefaults = UserDefaults.standard
// MARK: - UIApplicationDelegate methods
@discardableResult func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool {
print("Initializing app")
// Try to detect first launch
if launchCount == 0 {
print("...first launch detected")
applicationFirstLaunch()
}
// Update app launches count
launchCount += 1
print("...\(launchCount) launches")
// Try to detect version upgrade
let currentVersion = bundle.object(forInfoDictionaryKey: "CFBundleShortVersionString")
as! String
if let lastLaunchVersion = lastLaunchVersion, currentVersion != lastLaunchVersion {
print("...upgrade detected")
applicationDidUpgrade(from: lastLaunchVersion, to: currentVersion)
}
// Update last known version if new
if lastLaunchVersion != currentVersion {
print("...saving new version: \(currentVersion)")
lastLaunchVersion = currentVersion
}
// Update last known launch date
print("...saving current launch date")
appLastLaunchDate = Date()
// Make sure user defaults are saved
userDefaults.synchronize()
return true
}
// MARK: - Optional methods to override
func applicationFirstLaunch() {}
func applicationDidUpgrade(from: String, to: String) {}
// MARK: - Utilities
private(set) var launchCount: Int {
get {
return userDefaults.integer(forKey: Keys.appLaunchCount)
}
set {
userDefaults.set(newValue, forKey: Keys.appLaunchCount)
}
}
private(set) var lastLaunchVersion: String? {
get {
return userDefaults.string(forKey: Keys.appLastLaunchVersion)
}
set {
if let newValue = newValue {
userDefaults.set(newValue, forKey: Keys.appLastLaunchVersion)
} else {
userDefaults.removeObject(forKey: Keys.appLastLaunchVersion)
}
}
}
private(set) var appLastLaunchDate: Date? {
get {
return userDefaults.object(forKey: Keys.appLastLaunchDate) as? Date
}
set {
if let newValue = newValue {
userDefaults.set(newValue, forKey: Keys.appLastLaunchDate)
} else {
userDefaults.removeObject(forKey: Keys.appLastLaunchDate)
}
}
}
// MARK: - User default keys
private struct Keys {
static let appLaunchCount = "appLaunchCount"
static let appLastLaunchVersion = "appLastLaunchVersion"
static let appLastLaunchDate = "appLastLaunchDate"
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.