两个视图控制器之间的导航

Question

我有两个视图控制器。在mainViewController中点击后，TabBarButton用户转到1stViewController，点击后用户UIButton转到2ndViewController。

在让2ndViewController之前一切正常。但是在我的程序中添加segue函数后，我收到了错误。

could not cast value of type 'Calculator.1stViewController' (0x791a8) to 'Calculator.2ndViewController' (0x794c8).

简要说明我的代码是

  @IBAction func CalculateGpa(){
//Calucation Goes Here
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        var AnotherName : 2ndViewController = segue.destinationViewController as! 2ndViewController
//Code here
}

UIButton执行segue，BarButton不执行任何操作，只需转到1stView Controller即可。当我运行程序并单击BarButton即时获取上述错误。

因为prepareForSegue无法识别它应该执行哪个按钮吗？怎么解决呢？

Answer 1

试试这段代码。

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
    if (segue.identifier == "youridentifiername") {
      //your class name
        if let viewController: DealLandingViewController = segue.destinationViewController as? DealLandingViewController {
            viewController.dealEntry = deal
        }

    }
}