无法更改为具有多个 segues 的另一个视图控制器。我该如何解决？

Question

我在 Swift 中使用多个 segue，并且在 table 视图中有一个 UIAlertView。 UIAlertView 显示完美。当我单击第一个选项 (Ver Mapa) 时，它会完美地更改为另一个带有 segue (go_to_mapa) 的视图控制器 (Mapa)。但是，当我使用 segue (go_to_detalle) 按下第二个选项 (Ver detalle) 以更改为另一个视图控制器时，它不起作用。它什么都不做。我该如何解决这个问题？

override func prepareForSegue(segue: (UIStoryboardSegue!), sender: AnyObject!) {
    var refreshAlert = UIAlertController(title: "Menu", message: "Seleccione una opcion", preferredStyle: UIAlertControllerStyle.Alert)
    
    refreshAlert.addAction(UIAlertAction(title: "Ver Mapa", style: .Default, handler: { (action: UIAlertAction!) in
        if (segue.identifier == "go_to_mapa") {
            var svc = segue!.destinationViewController as Mapa;
            
            svc.cuenta = self.cuenta
            svc.user = self.user
            svc.password = self.password
            
            let indexPath = self.tableView.indexPathForSelectedRow();
            let currentCell = self.tableView.cellForRowAtIndexPath(indexPath!) as UITableViewCell!;
            
            svc.Device = currentCell.detailTextLabel!.text!
            svc.desc = currentCell.textLabel!.text!
            
            self.navigationController?.pushViewController(svc, animated: false) 
        }            
    }))
    refreshAlert.addAction(UIAlertAction(title: "Ver Vehiculo", style: .Default, handler: { (action: UIAlertAction!) in            
       if (segue.identifier == "go_to_detalle") {
            let vc = segue.destinationViewController as Detalle_Vehiculo     
        }
    }))
    refreshAlert.addAction(UIAlertAction(title: "Ejecutar comandos", style: .Default, handler: { (action: UIAlertAction!) in
        println("Ejecutar comandos")
    }))        
    presentViewController(refreshAlert, animated: true, completion: nil)
}

Answer 1

prepareForSegue: 在展示新控制器之前调用 shorty。来自文档：

Notifies the view controller that a segue is about to be performed.

因此，您不应在该方法中显示任何警报、弹出窗口。相反，您应该 destinationViewController 并在演示前适当调整它。

相反，您应该在 tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) 中显示警报，如下所示：

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    var refreshAlert = UIAlertController(title: "Menu", message: "Seleccione una opcion", preferredStyle: UIAlertControllerStyle.Alert)
    refreshAlert.addAction(UIAlertAction(title: "Ver Mapa", style: .Default, handler: { (action: UIAlertAction!) in
        self.performSegueWithIdentifier("go_to_mapa", sender:self)
    }))
    refreshAlert.addAction(UIAlertAction(title: "Ver Vehiculo", style: .Default, handler: { (action: UIAlertAction!) in
        self.performSegueWithIdentifier("go_to_detalle", sender:self)
    }))
    refreshAlert.addAction(UIAlertAction(title: "Ejecutar comandos", style: .Default, handler: { (action: UIAlertAction!) in
        println("Ejecutar comandos")
    }))
    presentViewController(refreshAlert, animated: true, completion: nil)
}

并准备：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "go_to_mapa" {
        var svc = segue!.destinationViewController as Mapa
        svc.cuenta = self.cuenta
        svc.user = self.user
        svc.password = self.password

        let indexPath = self.tableView.indexPathForSelectedRow();
        let currentCell = self.tableView.cellForRowAtIndexPath(indexPath!) as UITableViewCell!;

        svc.Device = currentCell.detailTextLabel!.text!
        svc.desc = currentCell.textLabel!.text!
    }
    else if segue.identifier == "go_to_detalle" {
        let vc = segue.destinationViewController as Detalle_Vehiculo
    }
}

无法更改为具有多个 segues 的另一个视图控制器。我该如何解决？

Can not change to another view controller with multiple segues. How can I resolve it?

ios

swift

uitableview

uistoryboardsegue