Example of string replacement in Swift with a dictionary

template.swift

import Foundation

class Template {

    class func render (var str: String, dict: Dictionary<String, String>) -> String {
        for (key, value) in dict {
            str = str.stringByReplacingOccurrencesOfString("{\(key)}", withString: value)
        }
        return str
    }
    
}

var dict : Dictionary<String, String> = [
    "item": "World"
]

Template.render("Hello {item}!", dict: dict)