swift How to cast from Int? to String

Question

In Swift, i cant cast Int to String by:

var iString:Int = 100 var strString = String(iString) 

But my variable in Int? , there for error: Cant invoke 'init' with type '@Ivalue Int?'

Example

let myString : String = "42" let x : Int? = myString.toInt()  if (x != null) {     // Successfully converted String to Int     //And how do can i convert x to string??? } 

Answer 1

You can use string interpolation.

let x = 100 let str = "\(x)" 

if x is an optional you can use optional binding

var str = "" if let v = x {    str = "\(v)" } println(str) 

if you are sure that x will never be nil, you can do a forced unwrapping on an optional value.

var str = "\(x!)" 

In a single statement you can try this

let str = x != nil ? "\(x!)" : "" 

Based on @RealMae's comment, you can further shorten this code using the nil coalescing operator (??)

let str = x ?? "" 

Answer 2

I like to create small extensions for this:

extension Int {     var stringValue:String {         return "\(self)"     } } 

This makes it possible to call optional ints, without having to unwrap and think about nil values:

var string = optionalInt?.stringValue