Converting String to Int with Swift

Updated answer for Swift 2.0+:

toInt() method gives an error, as it was removed from String in Swift 2.x. Instead, the Int type now has an initializer that accepts a String:

let a: Int? = Int(firstTextField.text)let b: Int? = Int(secondTextField.text)

Basic Idea, note that this only works in Swift 1.x (check out ParaSara's answer to see how it works in Swift 2.x):

    // toInt returns optional that's why we used a:Int?    let a:Int? = firstText.text.toInt() // firstText is UITextField    let b:Int? = secondText.text.toInt() // secondText is UITextField    // check a and b before unwrapping using !    if a && b {        var ans = a! + b!        answerLabel.text = "Answer is \(ans)" // answerLabel ie UILabel    } else {        answerLabel.text = "Input values are not numeric"    }

Update for Swift 4

...let a:Int? = Int(firstText.text) // firstText is UITextFieldlet b:Int? = Int(secondText.text) // secondText is UITextField...

myString.toInt() - convert the string value into int .

Swift 3.x

If you have an integer hiding inside a string, you can convertby using the integer's constructor, like this:

let myInt = Int(textField.text)

As with other data types (Float and Double) you can also convert by using NSString:

let myString = "556"let myInt = (myString as NSString).integerValue