７桁の郵便番号数字をランダムに生成し、日本の実在住所が取得できるまで再帰的に実行する

recuisiveFetchRandomJapanLocation.swift

import CoreLocation

let geoCoder = CLGeocoder()

var challangeCount = 0

func recursiveFetchJapanLocation(completion: (() -> ())?) {
    let randomAddress = Int.random(in: 0..<9999999)
    let randomAddressString = String(format: "%07d", randomAddress)
    challangeCount += 1
    print("チャレンジ!! \(randomAddressString) \(challangeCount)")
    geoCoder.geocodeAddressString("\(randomAddress)") { (placemarks, error) in
        if error != nil {
            recursiveFetchJapanLocation(completion: completion)
            return
        }
        print(placemarks?.first)
        completion?()
    }
}

recursiveFetchJapanLocation(completion: {
    print("終わったよ。")
})

チャレンジ!! 0331571 5403
チャレンジ!! 7169614 5404
チャレンジ!! 9669716 5405
チャレンジ!! 5168558 5406
Optional(516-8558, Ise-Shi, Mie, Japan 516-8558 @ <+34.46278510,+136.72252010> +/- 100.00m, region CLCircularRegion (identifier:'<+34.46278510,+136.72252010> radius 70.63', center:<+34.46278510,+136.72252010>, radius:70.63m))
終わったよ。