iOS Coordinator模式，Github代码在此
对于一些界面拥有多VC，或者多VC间跳转，如果都用delegate来通信就会变得很乱
Coordinator模式就是把多VC数据通信放到Coordinator里
首先来个Coordinator，在app launch时会初始化，它拥有一个navigator（举个里的，需要处理页面见跳转）
所有的VC都要准守Coordinating协议
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| enum Event {
case buttonTapped
}
protocol Coordinator {
var navigationController: UINavigationController? { get set }
var children: [Coordinator]? { get set }
func eventOccurred(with type: Event)
func start()
}
protocol Coordinating {
var coordinator: Coordinator? { get set }
}
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比如VC1里的button事件，发送到Coordinator去处理，目的就是要跳转到VC2
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| class ViewController: UIViewController, Coordinating {
var coordinator: Coordinator?
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = .systemRed
title = "Home"
let button: UIButton = {
let button = UIButton(frame: CGRect(x: 0, y: 0, width: 200, height: 100))
button.backgroundColor = .systemTeal
button.center = view.center
button.setTitle("Nav to Sec.", for: .normal)
button.addTarget(self, action: #selector(didTapButton), for: .touchUpInside)
return button
}()
self.view.addSubview(button)
}
@objc func didTapButton() {
coordinator?.eventOccurred(with: .buttonTapped)
}
}
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MainCoordinator就是来处理这些VC间的事件，这在模式在大型的app中很常见
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| class MainCoordinator: Coordinator {
var children: [Coordinator]? = nil
var navigationController: UINavigationController?
func eventOccurred(with type: Event) {
switch type {
case .buttonTapped:
var secondViewController: UIViewController & Coordinating = SecondViewController()
secondViewController.coordinator = self
navigationController?.pushViewController(secondViewController, animated: true)
}
}
func start() {
var vc: UIViewController & Coordinating = ViewController()
vc.coordinator = self
navigationController?.setViewControllers([vc], animated: false)
}
}
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别忘了在appdelegate和scenedelegate里初始化
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| let navVC = UINavigationController()
let mainCoordinator = MainCoordinator()
mainCoordinator.navigationController = navVC
let window = UIWindow(windowScene: windowScene)
window.rootViewController = navVC
window.makeKeyAndVisible()
self.window = window
mainCoordinator.start()
|
效果如下：
