Question

我花了最后几个小时来解决这个问题，但没有任何帮助。我的LocationHelper Delegate看起来像这样：

func locationManager(_ manager: CLLocationManager,didChangeAuthorization status: CLAuthorizationStatus) {
        switch status {
        case .notDetermined:
            print("not terminated")
            break
        case .authorizedWhenInUse, .authorizedAlways:
            NavigationBarController().checkLocationBasedElements(result: 1)

            print("auth okay")
            break
        case .restricted, .denied:
            NavigationBarController().checkLocationBasedElements(result: 2)
            print("auth denied")
            break
        }
    }

当授权状态发生变化时，我可以在控制台上正确看到打印输出。我的NavigationBarController.checkLocationBasedElements看起来像这样：

func checkLocationBasedElements(result: Int) -> Void{
        if(result == 2){
            print("checklocation: 2")
            tabBar.items?[1].isEnabled = false
            tabBar.items?[2].isEnabled = false
        }
        if(result == 1){
            //auth ok
            print("checklocation: 1")
            tabBar.items?[1].isEnabled = true
            tabBar.items?[2].isEnabled = true
        }

    }

当用户将auth-status更改为.authorizedWhenInUse时，控制台会提供此输出：

checklocation: 1
auth okay

所以可以说方法被正确调用了。但tabBar不会将isEnabled更改为true或false。我尝试了很多东西，例如将逻辑放入NavigationBarControllers的viewDidLoad或每次应用程序打开时检查权限状态，但这不是一个非常优雅的解决方案，我认为这样我实现了委托。我是否必须实现NavigationBarController，否则就像我已经完成它或你会推荐什么？

提前致谢！编辑： NavigationBarController：

import UIKit

class NavigationBarController: UITabBarController {

    //let locationHelper = LocationHelper()
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.


        let iconSize = CGSize(width: 35, height: 35)
        let iconUnselected = UIColor.white
        let iconSelected = UIColor.gray

        //Start
        tabBar.items?[0].title = "Start"
        tabBar.items?[0].setFAIcon(icon: .FAHome, size: iconSize, textColor: iconUnselected, backgroundColor: .clear, selectedTextColor: iconSelected, selectedBackgroundColor: .clear)

        //Live
        tabBar.items?[1].title = "Live"
        tabBar.items?[1].setFAIcon(icon: .FATachometer, size: iconSize, textColor: iconUnselected, backgroundColor: .clear, selectedTextColor: iconSelected, selectedBackgroundColor: .clear)

        //Messen
        tabBar.items?[2].title = "Messen"
        tabBar.items?[2].setFAIcon(icon: .FAClockO, size: iconSize, textColor: iconUnselected, backgroundColor: .clear, selectedTextColor: iconSelected, selectedBackgroundColor: .clear)

        //Ergebnisse
        tabBar.items?[3].title = "Ergebnisse"
        tabBar.items?[3].setFAIcon(icon: .FAWindowRestore, size: iconSize, textColor: iconUnselected, backgroundColor: .clear, selectedTextColor: iconSelected, selectedBackgroundColor: .clear)



        //Check GPS Permission
        //self.checkLocationBasedElements(result: LocationHelper.shared.checkStatus())


    }
    func checkLocationBasedElements(result: Int) -> Void{
        //look above

    }

Answer 1

问题在于这一行

  NavigationBarController().checkLocationBasedElements(result: 1)

您创建了另一个实例（NavigationBarController()）而不是提供的实例，因此请尝试将其设为共享单例，或使用通知中心/委托来通知启用/禁用tabBars

Answer 2

对于您当前的设计，最快的解决方案是：

您的NavigationBarController应声明class LocationHelper { //... weak var myTabBarController: NavigationBarController? //... }
的实例
```
myTabBarController
```
NavigationBarController应从class NavigationBarController: UITabBarController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. LocationHelper.shared.myTabBarController = self //... } }：
设置一次
```
locationManager(_ manager:didChangeAuthorization:)
```

您的myTabBarController?.checkLocationBasedElements(result:)应致电

NavigationBarController().checkLocationBasedElements(result:)

而不是

func locationManager(_ manager: CLLocationManager,didChangeAuthorization status: CLAuthorizationStatus) {
    switch status {
    case .notDetermined:
        print("not terminated")
    case .authorizedWhenInUse, .authorizedAlways:
        myTabBarController?.checkLocationBasedElements(result: 1)

        print("auth okay")
    case .restricted, .denied:
        myTabBarController?.checkLocationBasedElements(result: 2)
        print("auth denied")
    }
}

即。

NavigationBarController().checkLocationBasedElements(result:)

基本上当你checkLocationBasedElements(result:)执行NavigationBarController时，Swift的新实例与包含您看到的标签的实例不同。

来自其他类

2 个答案: