Question

我的推送通知点击问题。每次用户点击通知时，应用程序都会崩溃，而不是将用户重定向到指定的页面。

这部分代码导致错误＆＃34;无法转换类型＆＃39; appname.LaunchScreenController＆＃39;到＆＃39; UINavigationController＆＃39;＆＃34; ：

let rootViewController = self.window!.rootViewController as! UINavigationController

此代码会导致致命错误：在解包可选值时意外发现nil ：

 func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {
    //receive the notifications
    NotificationCenter.default.post(name: Notification.Name(rawValue: "MyNotificationType"), object: nil, userInfo: userInfo)
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let vc = storyboard.instantiateViewController(withIdentifier: "NewsController") as! NewsViewController
    let rootViewController = self.window!.rootViewController as! UINavigationController
    rootViewController.pushViewController(vc, animated:true)
}

提前致谢

Answer 1

RootViewController是UIViewController的子类而非UINavigationController您必须处理null值

更改为

let rootViewController = self.window!.rootViewController

Answer 2

我将代码更改为此，现在工作正常

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {
    NotificationCenter.default.post(name: Notification.Name(rawValue: "MyNotificationType"), object: nil, userInfo: userInfo)
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let vc = storyboard.instantiateViewController(withIdentifier: "NewsController") as! NewsViewController
    let nav  = UINavigationController()
    nav.pushViewController(vc, animated: true)

}

iOS推送通知点击导致应用崩溃

2 个答案: