Converting String to Int with Swift

Question

The application basically calculates acceleration by inputting Initial and final velocity and time and then use a formula to calculate acceleration. However, since the value

Answer 1

This works for me

var a:Int? = Int(userInput.text!)

Answer 2

//Xcode 8.1 and swift 3.0

We can also handle it by Optional Binding, Simply

let occur = "10"

if let occ = Int(occur) {
        print("By optional binding :", occ*2) // 20

    }

Answer 3

In Swift 4.2 and Xcode 10.1

let string:String = "789"
let intValue:Int = Int(string)!
print(intValue)

let integerValue:Int = 789
let stringValue:String = String(integerValue)
    //OR
//let stringValue:String = "\(integerValue)"
print(stringValue)

Answer 4

i have made a simple program, where you have 2 txt field you take input form the user and add them to make it simpler to understand please find the code below.

@IBOutlet weak var result: UILabel!
@IBOutlet weak var one: UITextField!
@IBOutlet weak var two: UITextField!

@IBAction func add(sender: AnyObject) {        
    let count = Int(one.text!)
    let cal = Int(two.text!)
    let sum = count! + cal!
    result.text = "Sum is \(sum)"
}

hope this helps.

Answer 5

Latest swift3 this code is simply to convert string to int

let myString = "556"
let myInt = Int(myString)

Answer 6

@IBAction func calculateAclr(_ sender: Any) {
    if let addition = addition(arrayString: [txtBox1.text, txtBox2.text, txtBox3.text]) {
      print("Answer = \(addition)")
      lblAnswer.text = "\(addition)"
    }
}

func addition(arrayString: [Any?]) -> Int? {

    var answer:Int?
    for arrayElement in arrayString {
        if let stringValue = arrayElement, let intValue = Int(stringValue)  {
            answer = (answer ?? 0) + intValue
        }
    }

    return answer
}