如何从swift中正确访问其他控制器中的一个控制器变量和方法？

我在HomePageViewController中创建了uiSegmentedControl。分段控制有两个项目。当我选择第一项时，我使用displayContentController方法在HomePageViewController中将sensorItemViewController内容添加为子视图。当点击第二项时，我想访问SensorTabItemViewController类的方法，它的名称是来自HomePageViewConroller的reloadMyTableView。我从sensorItemVC访问，但我得到“意外地发现零，而解包可选值”异常。如何正确访问HomePageViewControler的SensorItemTabViewController？谢谢大家响应如何从swift中正确访问其他控制器中的一个控制器变量和方法？

HomePageViewController.swift：

let segmentedControlItems = ["Table", "RefreshTableView"] 
    var viewControllerArray: Array<UIViewController> = [] 
    var segmentedControl : UISegmentedControl! 
    var sensorItemVC: SensorTabItemViewController! 


     class HomePageViewController: UIViewController,UIScrollViewDelegate { 

      override func viewDidLoad() { 
        super.viewDidLoad() 
      segmentedControl=UISegmentedControl(items: segmentedControlItems) 

        segmentedControl.selectedSegmentIndex=0 
        segmentedControl.tintColor=myKeys.darkBlueColor 
        segmentedControl.layer.cornerRadius = 0.0; 
        segmentedControl.layer.borderWidth = 1.5 
        segmentedControl.frame=CGRectMake(0, frameHeight/2, frameWidth, 35) 
        segmentedControl.addTarget(self, action: "changeSegmentedControlItem", forControlEvents: .ValueChanged) 
        self.view.addSubview(segmentedControl) 

      let sensorItemViewController = self.storyboard!.instantiateViewControllerWithIdentifier("sensorTabItemViewController") 
       viewControllerArray.append(sensorItemViewController) 

      } 

      func changeSegmentedControlItem(){ 

     print(segmentedControl.selectedSegmentIndex) 

     if(segmentedControl.selectedSegmentIndex==0){ 
       displayContentController(viewControllerArray[0]) 
     } 

     else{ 
     sensorItemVC.reloadMyTableView("Temp value", light: "Light value", noise: "noise Value", motion: "motion Value") 

     } 
    } 
    func displayContentController (content:UIViewController)  { 

     self.addChildViewController(content) 
     print(self.segmentedControl.frame.height) 
     content.view.frame=CGRectMake(0, self.frameHeight/2+self.segmentedControl.frame.height, self.frameWidth, 
     self.frameHeight-(segmentedControl.frame.height*2+self.frameHeight/2)) 
     self.view.addSubview(content.view) 
     content.didMoveToParentViewController(self) 


    } 


      }

SensorTabItemViewController。 swift如下：

class SensorTabItemViewController: UIViewController,UITableViewDataSource,UITableViewDelegate { 
    @IBOutlet weak var tableView: UITableView! 

    let sensorName=["Sıcaklık Sensörü","Işık Sensörü","Gürültü Sensörü","Hareket Sensörü"] 
    var sensorDetails=["","","",""] 
    var sensorImages: Array<UIImage> = [] 
    override func viewDidLoad() { 
     super.viewDidLoad() 
     print("sensorTab") 
     let tempImg=UIImage(named: "temp_ic") as UIImage? 
     let lightImg=UIImage(named: "light_ic") as UIImage? 
     let noiseImg=UIImage(named: "noise_ic") as UIImage? 
     let motionImg=UIImage(named: "motion_ic") as UIImage? 

     sensorImages.append(tempImg!) 
     sensorImages.append(lightImg!) 
     sensorImages.append(noiseImg!) 
     sensorImages.append(motionImg!) 



     // Do any additional setup after loading the view. 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 




    func reloadTableView(){ 
     sensorDetails=[] 
     sensorDetails.append(temp) 
     sensorDetails.append(light) 
     sensorDetails.append(noise) 
     sensorDetails.append(motion) 
     tableView.reloadData() 
    } 

    func numberOfSectionsInTableView(tableView: UITableView) -> Int { 
     return 1 
    } 
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     return sensorName.count 
    } 

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 
     let cell = tableView.dequeueReusableCellWithIdentifier("sensorCell", forIndexPath: indexPath) as UITableViewCell 
     cell.textLabel?.text=sensorName[indexPath.row] 
     cell.imageView?.image=sensorImages[indexPath.row] 
     cell.detailTextLabel?.text=sensorDetails[indexPath.row] 
     return cell 
    } 


}

来源

2016-01-13 yonder

更换如何这些控制器显示？我看到你声明'sensorItemVC' var，但你永远不会分配它。 – kelin

我该如何分配？ – yonder

使用assign操作符，在大多数语言中调用'='，包括swift。 – SmokeDispenser

您从未设置sensorItemVC的值。这就是为什么它是nil。我想这

let sensorItemViewController = self.storyboard!.instantiateViewControllerWithIdentifier("sensorTabItemViewController")

应

sensorItemVC = self.storyboard!.instantiateViewControllerWithIdentifier("sensorTabItemViewController") as! SensorTabItemViewController

来源

2016-01-13 08:53:31 Silmaril

我得到这个警报：不能分配值类型“UIViewController”类型SensorTabItemViewController – yonder

更新我的答案（忘记了类型转换） – Silmaril

谢谢你节省我的时间。我是swift和ios编程的新手。 – yonder

如何从swift中正确访问其他控制器中的一个控制器变量和方法？

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