CODEWITHSUNDEEP
swiftuitextfield
Dan
Dan

Reputation: 33

Multiply a UI text field with number - Swift

Just starting learning swift but stuck when trying to multiply an input with another number and display on a label. I get the error that the number isn't a string and tried to cast but didn't work. 

class ViewController: UIViewController {

    @IBOutlet weak var entry: UITextField!
    @IBOutlet weak var answer: UILabel!

    @IBAction func button(_ sender: Any) {

        answer.text = entry.text * 2
    }
}

Upvotes: 0

Views: 1820

Answers (2)

user3151675
user3151675

Reputation: 58149

You should cast the text into a Double, an Int etc., then convert the calculation to a string.

if let entry = Double(entry.text) {
    answer.text = "\(entry * 2)"
}

or

if let entry = Int(entry.text) {
    answer.text = "\(entry * 2)"
}

Upvotes: 1

Ken Darragh
Ken Darragh

Reputation: 59

If you know that the entry will hold a number

answer.text = String(Int(entry.text)! * 2)

Using optional unwrapping instead

if let num = Int(entry.text) {
    answer.text = String(num * 2)
}

Upvotes: 1

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