upstream-flutter-samples/platform_view_swift/ios/Runner/PlatformViewController.swift

// Copyright 2018, the Flutter project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import UIKit
import Foundation

protocol PlatformViewControllerDelegate {
    func didUpdateCounter(counter: Int)
}

class PlatformViewController : UIViewController {
    var delegate: PlatformViewControllerDelegate? = nil
    var counter: Int = 0
    
    @IBOutlet weak var incrementLabel: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setIncrementLabelText()
    }
    
    @IBAction func handleIncrement(_ sender: Any) {
        self.counter += 1
        self.setIncrementLabelText()
    }
    
    @IBAction func switchToFlutterView(_ sender: Any) {
        self.delegate?.didUpdateCounter(counter: self.counter)
        dismiss(animated:false, completion:nil)
    }
    
    func setIncrementLabelText() {
        let text = String(format: "Button tapped %d %@", self.counter, (self.counter == 1) ? "time" : "times")
        self.incrementLabel.text = text;
    }
}