如何使用条件转场

Posted 2023-03-14

【中文标题】如何使用条件转场

【英文标题】：how to work with conditional segue

【发布时间】：2017-06-29 10:21:38

【问题描述】：

我一直在尝试根据特定条件实现条件转换，但我不知道我落后的地方。如果有人可以帮助我，那将不胜感激 以下是代码：- 有两个 segues 需要处理，segueOtp& segueError

 @IBAction func btnToOtpScreen(_ sender: Any) 

        let providedMarketingRef = txtMarketingRef.text
        //let providedhopName = txtShopName.text

        if((providedMarketingRef?.isEmpty)!)
        
            displayAlertMessage(messageToDisplay: "Enter Your Marketing Reference")

        

        else
        

            let myUrl = URL(string: "http://kumbhkaran.co.in/ios_otp_check/request_sms.php");

            //let myUrl = URL(string: "http://kumbhkaran.co.in/OTPCheck/request_sms.php");
            var request = URLRequest(url:myUrl!);
            request.httpMethod = "POST";

            let postString = "email=\(Email)&mobile=\(UserName)&name=\(ShopName)"

            request.httpBody = postString.data(using: String.Encoding.utf8);

            let task = URLSession.shared.dataTask(with: request)  (data: Data?, response: URLResponse?, error: Error?) in

                DispatchQueue.main.async
                    

                        //spinningActivity!.hide(true)

                        if error != nil 
                            self.displayAlertMessage(messageToDisplay: error!.localizedDescription)
                            return
                        

                        do 
                            let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary

                            if let parseJSON = json 

                                var msg : String!

                                //getting json response
                                msg = parseJSON["message"] as! String?

                                print(msg)

                        if(msg == "SMS request is initiated! You will be receiving it shortly.")
                          

                            //self.performSegue(withIdentifier: "segueOTP", sender: self)

                            self.GlobalSegue="segueOTP"
                           
                             else if(msg == "Sorry! Error occurred in registration.")
                            
                                //self.performSegue(withIdentifier: "segueError", sender: self)
                             self.GlobalSegue="segueError"
                            

                            else if(msg == "Mobile number already existed!")
                           
                            //self.performSegue(withIdentifier: "segueError", sender: self)
                           self.GlobalSegue="segueError"
                            
                             else if(msg == "Sorry! mobile number is not valid or missing.")
                            
                                //self.performSegue(withIdentifier: "segueError", sender: self)
                               self.GlobalSegue="segueError"
                            


                            
                         catch
                            print(error)
                        



                

            

            task.resume()


        

    

override func prepare(for segue: UIStoryboardSegue, sender: Any?) 

    if (GlobalSegue=="segueOTP")
    
    let destViewController : OTPScreen = segue.destination as! OTPScreen
    destViewController.Category = Category
    destViewController.SubCategory = SubCategory
    destViewController.ShopName = ShopName
    destViewController.ManagerName = ManagerName
    destViewController.ManagerMobile = ManagerMobile
    destViewController.UserName = UserName
    destViewController.Landline = Landline
    destViewController.Email = Email
    destViewController.Website = Website
    destViewController.City = City
    destViewController.Address = Address
    destViewController.Area = Area
    destViewController.Pincode = Pincode
    destViewController.StartTime = StartTime
    destViewController.EndTime = EndTime
    destViewController.ShopStatus = ShopStatus
    destViewController.HomeDelivery = HomeConsultancy
    destViewController.Password = Password
    destViewController.MarketingRef = txtMarketingRef.text!
   destViewController.ImgShopName = ShopName
    destViewController.OtherCategory = Other
    destViewController.WorkerCount = WorkerCount
    destViewController.latitude = lblLatitude.text!
    destViewController.longitude = lblLongitude.text!

    else
    
        var _ : ErrorController = segue.destination as! ErrorController
    

//ErrorController 和 Congratulations 是两个不同的视图，我想根据条件转移。

【问题讨论】：

您的问题到底是什么？发生什么了？你想发生什么？

检查 if else 条件，那些 segue 不起作用。应该在不同的条件下调用两个不同的segue

设置断点并单步执行您的代码。看起来不错，但可能没有满足您的条件。

你在prepareForSegue做了什么？你能把代码分享给我们吗？

我已经分享了prepareForSegue的代码

【参考方案1】：

你必须通过它的标识符来区分segues：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) 

    switch segue.identifier 

    case "segueOTP":
       let destViewController = segue.destination as! OTPScreen
       destViewController.Category = Category
       destViewController.SubCategory = SubCategory
       destViewController.ShopName = ShopName
       destViewController.ManagerName = ManagerName
       destViewController.ManagerMobile = ManagerMobile
       destViewController.UserName = UserName
       destViewController.Landline = Landline
       destViewController.Email = Email
       destViewController.Website = Website
       destViewController.City = City
       destViewController.Address = Address
       destViewController.Area = Area
       destViewController.Pincode = Pincode
       destViewController.StartTime = StartTime
       destViewController.EndTime = EndTime
       destViewController.ShopStatus = ShopStatus
       destViewController.HomeDelivery = HomeConsultancy
       destViewController.Password = Password
       destViewController.MarketingRef = txtMarketingRef.text!
       destViewController.ImgShopName = ShopName
       destViewController.OtherCategory = Other
       destViewController.WorkerCount = WorkerCount
       destViewController.latitude = lblLatitude.text!
       destViewController.longitude = lblLongitude.text!

    case "segueError":
        var _ = segue.destination as! ErrorController

    default : break

    

注意：

请遵守变量名以小写字母开头的命名约定。