Swift 4: Checking if week, month, 2 months, etc. has passed since initial launch using Calendar - ios

Question

I'm trying to include timers so that a button appears a week, a month, 2 months, etc. after the initial launch date of the app.
I've used Date.addingTimeInterval (see code below), but it doesn't seem as effective for longer periods of time (week/months). The Swift documentation recommends using Calendar, but I'm not sure how to do that.
override func viewDidLoad() {
super.viewDidLoad()
if installedDate == nil {
installedDate = Date()
let timer = Calendar.current
Button1.isHidden = true
Button2.isHidden = true
Button3.isHidden = true
}
else {
print("Not first run")
print(installedDate!)
let Button1Date = Date().addingTimeInterval(604800) //for after 1 week
let Button2Date = Date().addingTimeInterval(2592000) //for after 1 month
let Button3Date = Date().addingTimeInterval(5184000) //for after 2 months
if installedDate == Button1Date {
Button1.isHidden = false
}
if installedDate == Button2Date {
Button2.isHidden = false
}
if installedDate == Button3Date {
Button.isHidden = false
}
}
}
var installedDate: Date? {
get {
return UserDefaults.standard.object(forKey: "installedDateKey") as? Date
}
set {
UserDefaults.standard.set(newValue, forKey: "installedDateKey")
}
}
What is a more efficient way of comparing the launch date to the expected date I need?

Answer 1

From what I understand of your question, you want a button to display if they have had the app for more than a certain amount of time. If that is the case, I've written some code that will be helpful to you:
let timeSinceInstalled = -(installedDate ?? Date()).timeIntervalSinceNow
Button1.isHidden = timeSinceInstalled < 604800
Button2.isHidden = timeSinceInstalled < 2592000
Button3.isHidden = timeSinceInstalled < 5184000
You can actually replace most of the code inside of your viewDidLoad() function, even the part where you check if installedDate == nil. Here is your updated code:
override func viewDidLoad() {
super.viewDidLoad()
let timeSinceInstalled = -(installedDate ?? Date()).timeIntervalSinceNow
Button1.isHidden = timeSinceInstalled < 604800
Button2.isHidden = timeSinceInstalled < 2592000
Button3.isHidden = timeSinceInstalled < 5184000
}
var installedDate: Date? {
get {
return UserDefaults.standard.object(forKey: "installedDateKey") as? Date
}
set {
UserDefaults.standard.set(newValue, forKey: "installedDateKey")
}
}
If you want to set the title to "You have none available" when the button should not be clickable, here is the code for that:
override func viewDidLoad() {
super.viewDidLoad()
let timeSinceInstalled = -(installedDate ?? Date()).timeIntervalSinceNow
setTitle(Button1, timeSinceInstalled < 604800)
setTitle(Button2, timeSinceInstalled < 2592000)
setTitle(Button3, timeSinceInstalled < 5184000)
}
func setTitle(_ button: UIButton, _ statement: Bool) {
button.setTitle(statement ? "You have none available" : "Click me", for: .normal)
button.isEnabled = !statement
}
var installedDate: Date? {
get {
return UserDefaults.standard.object(forKey: "installedDateKey") as? Date
}
set {
UserDefaults.standard.set(newValue, forKey: "installedDateKey")
}
}