main.swift

func() {
	let recursion = RecursionClosure(itemArray: ["ずん", "どこ"], decisionStr: "ずんずんずんずんどこ", maxCount: 5)
	
	let result = recursion.recursionZunDoko()
}

Recursion.swift

import Foundation
import UIKit

class Recursion: NSObject {
	
	internal var zundoko = [String]()
	
	internal var item: [String]!
	internal var decision: String!
	internal var count: Int!
	
	internal var resultNumber = 0
	
	override init() {
		super.init()
	}
	
	convenience init(itemArray: [String], decisionStr: String, maxCount: Int) {
		self.init()
		
		item = itemArray
		result = resultStr
		decision = decisionStr
		count = maxCount
	}
	
	func recursionZunDoko() -> Bool {
		
		zundoko.append(getZundoko())
		
		resultNumber += 1
		
		if checkZundoko() {
			return true
		} else {
			return recursionZunDoko()
		}
		
	}

	internal func getZundoko() -> String {
		let random = arc4random_uniform(UInt32(item.count))
		
		return item[Int(random)]
	}

	internal func checkZundoko() -> Bool {
		
		if zundoko.count > count {
			zundoko.removeFirst()
		}
		
		let str = zundoko.reduce("", combine: +)
		
		if str == decision {
			return true
		} else {
			return false
		}
		
	}

}