Set age limit with UIDatePicker, Swift iOS

Question

I want to set the age limit, when I select the date of birth if the age is less than 18, then I print an error

 @objc func handleDatePicker(sender: UIDatePicker) {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "dd/MMMM/yyyy"

        dateBirthday.text = dateFormatter.string(from: sender.date)

        if let date = dateFormatter.date(from: dateBirthday.text!) {
            let age = Calendar.current.dateComponents([.year], from: date, to: Date()).year!
            print(age)  //
            self.age.text = "You are \(age) age"
            `continue`.isEnabled = true
        } else {

            let date = dateFormatter.date(from: dateBirthday.text!)
            let age = Calendar.current.dateComponents([.year], from: date!, to: Date()).year!
            print(age)
          if age < 18 {

                self.age.text = "Error you are \(age)"
            }
    }
    }

What's wrong with your code? You should get the date/age anyway, and then apply the if/else (<18) code. — Larme, May 06 '18 at 18:55
Think: You wrote an `if let/else` test. Where does your code? Does it pass the if let? Why should it pass it, or why it shouldn't. Then read the second line of my previous comment. — Larme, May 06 '18 at 18:59

score 2 · Answer 1 · answered May 06 '18 at 19:18

You can do it like this:

    if let date = dateFormatter.date(from: dateBirthday.text!) {
        let age = Calendar.current.dateComponents([.year], from: date, to: Date()).year!

        if age >= 18 {
            print(age)
            self.age.text = "You are \(age) age"
            continue.isEnabled = true
        } else {
            self.age.text = "Error you are \(age)"
        }
    }

Zyntx · Answer 2 · 2018-05-06T19:31:35.113

2

Move your date and age formatter out of your if statements. Usually, if you have the same code in both branches of an if statement it can be pulled before or after the code.

if let date = dateFormatter.date(from: dateBirthday.text!) {
    let age = Calendar.current.dateComponents([.year], from: date!, to: Date()).year!
    print(age)

    if age < 18 {
       self.age.text = "Error you are \(age)"
    } else {
       self.age.text = "You are \(age) age"
       `continue`.isEnabled = true
    }
}

edited May 06 '18 at 19:31

answered May 06 '18 at 19:21

Zyntx

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1

I see @rbaldwin and I came up with pretty much the same answer... – Zyntx May 06 '18 at 19:25
1

Except your < is the wrong way round ;) – rbaldwin May 06 '18 at 19:25
Ha!! Right, corrected. Good catch. – Zyntx May 06 '18 at 19:27
It needs to be `>= 18`. `>18` means 18 will fall through to the error statement. The OP wants to filter less than 18. :) – rbaldwin May 06 '18 at 19:28
I think he can figure that out, but you are correct. ;) But I'm just going to reverse the check. – Zyntx May 06 '18 at 19:30

Set age limit with UIDatePicker, Swift iOS

2 Answers2