iOS-Storyboard入門指南

1 、在工程中創建一個storyboard文件，比如我現在"Authorization.storyboard”這個文件。然後我們可以在storyboard可視化視圖中創建多個viewcontroller，navigationcontroller或者Storyboard Reference。

如果storyboard中存在比較多VC，關鍵要找到入口，Storybord Entry Point。

舉例：
在storyboard文件中創建Storyboard Reference，記得在第五個入口設置Storyboard名稱

在Authorization.storyboard中創建Splash ScreenVC Scene，創建步驟如下，SplashScreenVC爲對應的controller文件。注意點，必須填寫Class ， Storyboard ID這兩個選項

2、用代碼來獲取剛纔創建的storyboard。也就是第一步的"Authorization.storyboard" 文件。

let storyboard = UIStoryboard(name: "Authorization", bundle: nil)

2-1、storyboard帶有 Storyboard ID方法來獲取 SplashScreenVC。

let current = storyboard.instantiateViewController(withIdentifier: "SplashScreenVC") as! SplashScreenVC

2-2、由閃屏界面切換到登陸輸入框界面(authNavVC)
創建一個RootparentVC:UIViewController,提供一個var current:UIViewController變量。（curent根據不同情況展示不同的vc）
假設一開始是顯示SplashScreenVC(閃屏界面)

 init() {
        let storyboard = UIStoryboard(name: "Authorization", bundle: nil)
        current = storyboard.instantiateViewController(withIdentifier: "SplashScreenVC") as! SplashScreenVC
        super.init(nibName:  nil, bundle: nil)
    }

2-3、在viewdidLoad （當前VC添加新VC,設置新VC的frame,當前view添加新VC的view,新VC move to parentVC)

 addChildViewController(current)
 current.view.frame = view.bounds
 view.addSubview(current.view)
 current.didMove(toParentViewController: self)

2-4、切換顯示登陸界面（authNavVC）（當前VC添加新VC,設置新VC的frame,當前view添加新VC的view,新VC move to parentVC)

   func showLoginScreen() {
        let storyboard = UIStoryboard(name: "Authorization", bundle: nil)
        let authNavVC = storyboard.instantiateViewController(withIdentifier: "AuthNavVC") as! UINavigationController
        
        addChildViewController(authNavVC)
        authNavVC.view.frame = view.bounds
        view.addSubview(authNavVC.view)
        authNavVC.didMove(toParentViewController: self)
        
        current.willMove(toParentViewController: nil)
        current.view.removeFromSuperview()
        current.removeFromParentViewController()
        current = authNavVC
    }

3、自定義UIStoryboardSegue

import Foundation

class ReplaceSegue : UIStoryboardSegue {
    
    override func perform() {
        let sourceViewController = self.source
        let destinationViewController = self.destination
        
        let navigationController = sourceViewController.navigationController
        
        navigationController?.pushViewController(destinationViewController, animated: false)
        
        guard var mutableVC = navigationController?.viewControllers else {
            debugPrint("[ReplaceSegue] Error: no view controllers")
            return
        }
        
        guard let sourceViewControllerIndex = mutableVC.index(of: sourceViewController) else {
            debugPrint("[ReplaceSegue] Error: no index for source view controller")
            return
        }
        
        mutableVC.remove(at: sourceViewControllerIndex)
        
        navigationController?.setViewControllers(mutableVC, animated: true)
    }
    
}

3-1、舉例：點擊會話列表某一條信息，攜帶會話ID參數，進入聊天詳情。
在會話列表代碼爲：

 performSegue(withIdentifier: "SA_STR_SEGUE_GO_TO_CHAT".localized , sender: dialog.id)

重寫prepare方法。

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "SA_STR_SEGUE_GO_TO_CHAT".localized {
            if let chatVC = segue.destination as? ChatViewController {
                chatVC.dialogID = sender as? String
            }
        }
    }