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自己revealViewController()返回nil

swrevealviewcontroller swift

williej926 · 技术社区 · 7 年前

https://github.com/John-Lluch/SWRevealViewController

    import Foundation
    import UIKit
    class MainViewController : UIViewController{
    @IBOutlet weak var mainButton: UIView!
    @IBOutlet weak var Open: UIBarButtonItem!
    override func viewDidLoad() {
        super.viewDidLoad()

    }
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated);
        mainButton.makeCircle();
        Open.target = self.revealViewController()
        Open.action = #selector(SWRevealViewController.revealToggle(_:));
        self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer());
    }
}

2 回复 | 直到 7 年前

Lawliet 7 年前

很可能您还没有设置 SWRevealViewController rootViewController .记住设置 自定义类 和成为在你的 身份检查员 .

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let rootVC = storyboard.instantiateViewController(withIdentifier: "SWRevealViewController")    
    self.view.window?.rootViewController = rootVC

    // Cont. with your code...
}

AppDelegate ,允许窗口更新 rootViewController

func changeRootVCToSWRevealVC () {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let rootVC = storyboard.instantiateViewController(withIdentifier: "SWRevealViewController")
    if let window = self.window{
        window.rootViewController = rootVC
    }
}

rooViewController 到 .

if let appDelegate = UIApplication.shared.delegate as? AppDelegate {
    appDelegate.changeRootVCToSWRevealVC()
}

如果您有一个存储上次登录状态的变量,并且希望直接导航到导航抽屉菜单,而不是 LoginViewController

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    let rootVCId = isLoggedin ? "SWRevealViewController" : "LoginViewController"
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let rootVC = storyboard.instantiateViewController(withIdentifier: rootVCId)    
    self.view.window?.rootViewController = rootVC

    // Cont. with your code...
}

Chris Sprague 6 年前

我也遇到了同样的问题,于是我看到了这篇文章。我的问题更像是“哎呀!”我错过了一些显而易见的事情,花了30分钟挠头脸掌:

如果接受的答案不适合您,请检查以确保您已使用插座将菜单属性连接到故事板。

@IBOutlet weak var menuButton:UIBarButtonItem!

override func viewDidLoad() {
    if (self.revealViewController() != nil) {
        menuButton.target = self.revealViewController()
        menuButton.action = #selector(SWRevealViewController.revealToggle(_:))
    }
}

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