This is a sample of a delegate that executes functions, etc. from one View to another ViewController.
In this case, I changed the background color of the original view from a modal view using a delegate.
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| import UIKit | |
| protocol SampleDelegate: class { | |
| func changeBackgroundColor(color:UIColor) | |
| } | |
| class SecondViewController: UIViewController { | |
| //delegate | |
| weak var delegate: SampleDelegate? | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| self.view.backgroundColor = UIColor.gray | |
| //ボタンの生成 | |
| let deleteModalBtn = UIButton() | |
| deleteModalBtn.frame.size = CGSize(width: 150, height: 50) | |
| deleteModalBtn.center.x = self.view.center.x | |
| deleteModalBtn.center.y = self.view.center.y | |
| deleteModalBtn.backgroundColor = UIColor.white | |
| deleteModalBtn.addTarget(self, action: #selector(deleteModalBtnClicked(sender:)), for:.touchUpInside) | |
| deleteModalBtn.setTitle("モーダル閉じる", for: UIControlState.normal) | |
| deleteModalBtn.setTitleColor(UIColor.gray, for: UIControlState.normal) | |
| self.view.addSubview(deleteModalBtn) | |
| } | |
| func deleteModalBtnClicked(sender: UIButton){ | |
| //乱数を用いてランダムに色を作成する | |
| let red:Float = Float(arc4random_uniform(255))/255 | |
| let green:Float = Float(arc4random_uniform(255))/255 | |
| let blue:Float = Float(arc4random_uniform(255))/255 | |
| let bgColor:UIColor = UIColor(colorLiteralRed: red, green: green, blue: blue, alpha: 1) | |
| //デリゲートを用いて初めのViewの色をランダムに変える | |
| delegate?.changeBackgroundColor(color: bgColor) | |
| //モーダルViewを閉じる | |
| self.dismiss(animated: true, completion: nil) | |
| } | |
| } |
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| import UIKit | |
| class ViewController: UIViewController,SampleDelegate { | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| //ボタンの生成 | |
| let showModalBtn = UIButton() | |
| showModalBtn.frame.size = CGSize(width: 150, height: 50) | |
| showModalBtn.center.x = self.view.center.x | |
| showModalBtn.center.y = self.view.center.y | |
| showModalBtn.backgroundColor = UIColor.gray | |
| showModalBtn.addTarget(self, action: #selector(showModalBtnClicked(sender:)), for:.touchUpInside) | |
| showModalBtn.setTitle("モーダル表示", for: UIControlState.normal) | |
| showModalBtn.setTitleColor(UIColor.white, for: UIControlState.normal) | |
| self.view.addSubview(showModalBtn) | |
| } | |
| func showModalBtnClicked(sender: UIButton){ | |
| //モーダルで別ビューを表示する | |
| let secondVC:SecondViewController = SecondViewController() | |
| secondVC.delegate = self | |
| present(secondVC, animated: true, completion: nil) | |
| } | |
| //Delegateで呼ぶViewの背景色を変えるメソッド | |
| func changeBackgroundColor(color:UIColor){ | |
| self.view.backgroundColor = color | |
| } | |
| } |