Memo

UIKit+Playground
■Playgroundでボタンやラベルを確認import UIKit

var myLabel = UILabel(frame: CGRect(x: 0, y: 0, width: 100, height: 30))
myLabel.backgroundColor = UIColor.gray
myLabel.text = "テスト"
■PlaygroundでJSONを取得

※あらかじめ
  https://refirio.org/memos/ios/json_book.php
  に以下のプログラムを用意している

<?php

$data  = array(
    'books' => array(
        array(
            'title' => 'C言語入門',
            'price' => '1500'
        ),
        array(
            'title' => 'JAVA言語入門',
            'price' => '1600'
        ),
        array(
            'title' => 'Ruby言語入門',
            'price' => '2000'
        )
    )
);

echo json_encode($data);
exit;
import Foundation
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true

class Client {

    func someTask() {
        let target = URL(string: "https://refirio.org/memos/ios/json.php")!
        let task   = URLSession.shared.dataTask(with: target) { data, response, error in
            if let jsonData = data {
                self.printJSON(jsonData)
            }
        }
        task.resume()
    }

    func printJSON(_ data: Data) {
        do {
            let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments)
            print(json)

            if let items = (json as AnyObject).object(forKey: "books") {
                for item in items as! NSArray {
                    guard let title = (item as AnyObject).object(forKey: "title") else {
                        continue
                    }
                    guard let price = (item as AnyObject).object(forKey: "price") else {
                        continue
                    }

                    print(title)
                    print(price)

                }
            }
        } catch {
            print("parse error!")
        }
    }

}

let client = Client()
client.someTask()
■PlaygroundでViewControllerを使う

[iOS 10] PlaygroundでUIKitの描画を行う ｜ Developers.IO
http://dev.classmethod.jp/smartphone/ios-10-playground-uikit-draw/
Memo

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