在表格視圖中爲不同的視圖控制器編寫segue函數

Question

當我點擊表格視圖的行時，應該使用不同視圖控制器中的細節進行編輯。我的準備階段功能有問題。此外，還可以在新的不同控制器中編寫代碼以在此頁面中查看。

import UIKit 

class VehiclesViewController: UIViewController, UITableViewDataSource, UITableViewDelegate{ 


    var tableView:UITableView? 
    var items = NSMutableArray() 

    override func viewWillAppear(animated: Bool) { 
     let frame:CGRect = CGRect(x: 0, y: 100, width: self.view.frame.width, height: self.view.frame.height) 
     self.tableView = UITableView(frame: frame) 
     self.tableView?.dataSource = self 
     self.tableView?.delegate = self 
     self.view.addSubview(self.tableView!) 
     addDummyData() 
    } 

    func addDummyData() { 
     self.items.removeAllObjects() 
     RestApiManager.sharedInstance.getVehicleList { json in 
      let results = json 
      println(results.description) 
      for (index: String, subJson: JSON) in results { 
       let vehicle: AnyObject = subJson.object; 
       self.items.addObject(vehicle); 
       dispatch_async(dispatch_get_main_queue(), { 
        tableView?.reloadData() 
       }); 
      } 
     } 
    } 

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 

     var secondScene = segue.destinationViewController as! VehicleEditViewController 

     if let indexPath = self.tableView?.indexPathsForSelectedRows(){ 
      let selectedVehicle: AnyObject = self.items[indexPath.row] 
      secondScene.detailedDescriptionLabel = selectedVehicle as! UILabel 
     } 

    } 



    func numberOfSectionsInTableView(tableView: UITableView) -> Int { 
     return 1 
    } 


    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     return self.items.count; 
    } 

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 
     var cell = tableView.dequeueReusableCellWithIdentifier("CELL") as? UITableViewCell 

     if cell == nil { 
      cell = UITableViewCell(style: UITableViewCellStyle.Value1, reuseIdentifier: "CELL") 
     } 

     println("something about the table"); 

     let vehicle:JSON = JSON(self.items[indexPath.row]) 
     cell!.textLabel?.text = vehicle["vrn"].string 


     let status = vehicle["liveView"]["currentStatus"].string 
     cell!.backgroundColor = getColorForStatus(status!) 

     var stateString = "" 
     var speedIn = " mph" 
     switch(status!) { 
      case "moving": 
       stateString = vehicle["liveView"]["gpsPosition"]["speed"].stringValue + speedIn 
       break; 
      case "idle": 
       stateString = vehicle["liveView"]["lastState"].string! 
       break; 
      case "stop": 
       stateString = "Stationary" 
       break; 
      default: 
       stateString = "State Unknown" 
     } 
     cell?.detailTextLabel?.text = stateString 


     return cell! 
    } 



    func getColorForStatus(status : String) -> UIColor { 
     switch(status) { 
      case "moving": 
       return UIColor.greenColor(); 
      case "idle": 
       return UIColor.yellowColor(); 
      case "stop": 
       return UIColor.redColor(); 
      default: 
       return UIColor.whiteColor() 
     } 
    } 
} 

Answer 1

你沒有performSegueWithIdentifier。 試試這個：

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) { 
     performSegueWithIdentifier("yourSegueNameToEditVehicles", sender : indexPath) } 

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 

    var secondScene = segue.destinationViewController as! VehicleEditViewController 

    if let indexPath = sender as! NSIndexPath{ 
     let selectedVehicle: AnyObject = self.items[indexPath.row] 
     secondScene.detailedDescriptionLabel = selectedVehicle as! UILabel 
    } 

} 

要確保你有你的故事板你的兩個視圖之間的良好名SEGUE。

Answer 2

但是當我在控制檯secondScene.detailedDescriptionLabel顯示nil打印。我可以在selectedVehicle中接收我的json對象。但我無法將JSON對象轉換爲任何可以在第二個控制器中使用的變量。