Question

我写了一个更改导航栏颜色的函数：

func changeNavigationBarTitleAndAppearance(title title:String) {

    switch (title) {

    case "active":
        self.title = "Einsatzbereit".uppercaseString

        if let navController = navigationController {
            navController.navigationBar.barTintColor = UIColor(red: 73.0/255.0, green: 181.0/255.0, blue: 177.0/255.0, alpha: 1.0)
        }

    case "inactive":
        self.title = "Inaktiv".uppercaseString

        if let navController = navigationController {
            navController.navigationBar.barTintColor = UIColor(red: 40.0/255.0, green: 51.0/255.0, blue: 57.0/255.0, alpha: 1.0)
        }

    case "dispatch":
        self.title = "Alarmierung".uppercaseString

        if let navController = navigationController {
            navController.navigationBar.barTintColor = UIColor(red: 208.0/255.0, green: 2.0/255.0, blue: 27.0/255.0, alpha: 1.0)
        }

    default:
        return
    }


func dispatchReceived(notification: NSNotification) {
    print(notification.name)
    switch (notification.name) {

    case "DISPATCH_RECEIVED":
        self.changeNavigationBarTitleAndAppearance(title: "dispatch")

    case "DISPATCH_ACCEPTED":
        self.changeNavigationBarTitleAndAppearance(title: "active")

    case "DISPATCH_DECLINED":
        self.changeNavigationBarTitleAndAppearance(title: "active")

    default:
        return
    }

}

我发送的第一个通知是：“DISPATCH_RECEIVED”。正如预期的那样，导航栏色调变为红色，如函数中所述。但是当我发送消息“DISPATCH_DECLINED”时，函数会按预期调用以更改颜色，但不会再发生任何事情而且一切都会保持红色。

视图控制器观察：

self.notificationCenter.addObserver(self, selector: "dispatchReceived:", name: "DISPATCH_RECEIVED", object: nil)

self.notificationCenter.addObserver(self, selector: "dispatchReceived:", name: "DISPATCH_DECLINED", object: nil)

并调用与预期相关的方法。

当我发送“DISPATCH changeNavigationBarTitleAndAppearance(title: "dispatch")

的通知时，整个过程适用于第一次通话

但是当我发送第二个通知时

收到通知时更改色调颜色

0 个答案: