Question

我有3个视图控制器（拨号器，音频和呼叫视图控制器），拨号器和音频只有它连接到布局并通过音频视图调用它的呼叫，当我在拨号器视图控制器中点击callButton时我必须传递值CallViewController然后直接调用具有StoryBoardID（AudioViewController）的AudioViewController，但我不知道这行返回null，所以我无法移动到AudioViewController。

callViewController = storyboard?.instantiateViewControllerWithIdentifier("AudioCallViewController") as! AudioCallViewController

完整代码：

拨号器视图：

class DialerViewController: UIViewController,UITextFieldDelegate {



@IBOutlet weak var progNameLabel: UILabel!
@IBOutlet weak var progNumberLabel: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "onConnectionStatusNotification:", name: NOTIFICATION_PHONE_EVENT, object: nil)

}

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    navigationController?.setNavigationBarHidden(true, animated: false)
    UIDevice.currentDevice().proximityMonitoringEnabled = false
}



@IBAction func makeCallButton(sender: AnyObject) {



    let ownNumber = AppDelegate.sharedInstance().phone?.config().regUser
    if !ownNumber!.isEmpty || progNumberLabel.text != ownNumber {

        var callViewController: CallViewController?

            callViewController = storyboard?.instantiateViewControllerWithIdentifier("AudioCallViewController") as! AudioCallViewController     //Exception in this line 


        callViewController?.number = progNumberLabel.text
        //self.presentedViewController(callViewController,  animated:true, completion:nil)
        navigationController?.pushViewController(callViewController!, animated: true)
    }


}



func onConnectionStatusNotification(notification: NSNotification) {
    let status = PhoneEvents(rawValue: notification.object!.integerValue)
    let _ = status! == .RegSuccess
}



deinit {
    NSNotificationCenter.defaultCenter().removeObserver(self)
}

}

CallView：

class CallViewController: UIViewController, UITextFieldDelegate {

var number: String?
var callId: Int?
var incoming: Bool?

override func viewDidLoad() {
    super.viewDidLoad()
    print("The Number is" + number!)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "onConnectionStatusNotification:", name: NOTIFICATION_PHONE_EVENT, object: nil)
}

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    navigationController?.setNavigationBarHidden(true, animated: false)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "onCallNotification:", name: NOTIFICATION_CALL_EVENT, object: nil)


}

func closeView() {
    if self == navigationController?.topViewController {
        navigationController?.popViewControllerAnimated(true)
    }
}

func onCallNotification(notification: NSNotification) {

}

func onConnectionStatusNotification(notification: NSNotification) {

}



deinit {
    NSNotificationCenter.defaultCenter().removeObserver(self)
}

}

AudioViewController：

class AudioCallViewController: CallViewController {

 ............. 

  }

Answer 1

NULL

在上面，你没有声明callViewController = storyboard?.instantiateViewControllerWithIdentifier("AudioCallViewController") as! AudioCallViewController //Exception in this line是什么，所以肯定会返回null

默认情况下，您的故事板应为storyboard，因此请在该声明上方添加此代码

Main

具有标识符的实例化视图控制器返回nil？

1 个答案: