执行分段到非默认选项卡视图控制器模式不同的情节提要

Question

我想执行segue（模式上从一个视图控制器到另一个选项卡视图控制器）。但问题是它正在加载默认的（索引为0的）视图控制器。这是代码：

   override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
    if (segue.identifier == "toRateSegue") {
        let nav = segue.destinationViewController as! UINavigationController
        let svc = nav.topViewController as! RateViewController;
        svc.cell = self.cellSelected
    }
    if (segue.identifier == "toChat") {
        let tabIndex = 1
        let segue = segue.destinationViewController as! UITabBarController
        if let navVC = segue.viewControllers?[0] as? UINavigationController {
            let vc = navVC.viewControllers.first as! CustomProfileViewController
            vc.event = self.event
        }
        if let navVC = segue.viewControllers?[tabIndex] as? UINavigationController {
            let vc = navVC.viewControllers.first as! ChatViewController
            vc.event = self.event
            print("Event is (self.event.eventId)")
            // if self is the event creator
            if (self.userName == self.event.createdBy.objectForKey("username") as? String)
            {

                let query = PFQuery(className:"Event")
                query.getObjectInBackgroundWithId(self.event.eventId!) {
                    (curevent: PFObject?, error: NSError?) -> Void in
                    if error == nil && curevent != nil {
                        let userObject:PFUser = curevent!["joinedBy"] as! PFUser
                        print("userObject.objectId (userObject.objectId)")
                        vc.otherName =  String(userObject.objectForKey("firstname")!)
                        vc.otherProfileName = String(userObject.objectForKey("firstname")!)
                        //print("vc.otherProfileName (vc.otherProfileName)")
                        let senderuserName = PFUser.currentUser()!["username"] as? String
                        //print("senderuserName (senderuserName)")
                        vc.roomid = self.event.geteventID()  + vc.otherProfileName + senderuserName!
                       // print("roomid (vc.roomid)")
                    } else {
                        print(error)
                    }
                }
            }else
            {
                vc.otherName = (self.event.createdBy.objectForKey("firstname") as? String)!
                vc.otherProfileName = (self.event.createdBy.objectForKey("firstname") as? String)!
                let senderuserName = PFUser.currentUser()!["username"] as? String
                vc.roomid = event.geteventID() + senderuserName! + vc.otherProfileName
            }

             self.tabBarController?.selectedIndex = tabIndex
    }
    }
}

我说的是toChat segue。它在tableview函数中被调用如下：

let connect = UITableViewRowAction(style: .Normal, title: "Connect") { action, index in
            self.event = cell.event
        self.performSegueWithIdentifier("toChat", sender: nil)

    }`

我想转到索引1而不是索引0处的选项卡视图。

Answer 1

要移动到UITabBarController中的另一个选项卡，在prepareForSegue中，将destinationViewController（UITabBarController:）的selectedIndex设置为1

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if let dvc = segue.destinationViewController as? UITabBarController {
        dvc.selectedIndex = 1
    }
}