ios - Swift:为所有 View 添加离线栏，例如在Facebook Messenger中

我开发了一个iOS应用程序，其中的数据由在线服务器提供，我正在使用Reachability 检查互联网连接的可用性，我现在需要做的是，创建一个如facebook messenger中的栏，当没有互联网连接可用时，它会立即出现在我的项目中的当前（每个）UIViewcontroller中，我如何才能做到这一点？

最佳答案

创建自己的窗口以消除条件。

import UIKit
import ReachabilitySwift

class HSWindow: UIWindow {

    let sharedReachability = Reachability()!

    // override point for subclass. Do not call directly
    open override func becomeKey(){

        sharedReachability.whenReachable = { reachability in
            OperationQueue.main.addOperation({
                self.removeRechabilityView()
            })
        }

        sharedReachability.whenUnreachable = { reachability in
            OperationQueue.main.addOperation({
                self.addRechabilityView()
            })
        }

        do {
            try sharedReachability.startNotifier()
            print("sharedReachability.startNotifier : Starting.....")
        } catch {
            print("sharedReachability.startNotifier : Unable to start notifier")
        }
    }

    // override point for subclass. Do not call directly
    open override func resignKey(){
        sharedReachability.stopNotifier()
    }
}

//add remove Rechability view
extension HSWindow {
    func addRechabilityView(){
        self.removeRechabilityView()
        let view = HSRechabilityView(); //you any custom view that you want to show on internet connection loss
        self.addSubview(view)

        view.snp.makeConstraints { (make) in //instead of this you can give frame, I have used snapKit here
            make.edges.equalTo(self)
        }
    }

    func removeRechabilityView(){
        for view in self.subviews { //find your view and remove when internet connected
            if view is HSRechabilityView {
                view.removeFromSuperview()
                break;
            }
        }
    }
}

在AppDelegate中-didFinishLaunching方法

self.window =  HSWindow(frame: UIScreen.main.bounds) //user your custom window instead of default one, and this will do all magic without any code
self.window.makeKeyAndVisible()

如果你在这个流程中有任何问题，请告诉我