How to replace string into string in Swift?

You can use stringByReplacingOccurrencesOfString, e.g.

let s1 : String = "Red small car"
let s2 = s1.stringByReplacingOccurrencesOfString("small", withString: "big")

You can try using stringByReplacingOccurrencesOfString

let string = "Big red car"
let replaced = (string as NSString).stringByReplacingOccurrencesOfString("Big", withString: "Small")

Edit In Swift 5

import Foundation

let string = "Big red car"
let replaced = string.replacingOccurrences(of: "Big", with: "Small")

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