ios - 未在 UIBarButtonItem 选择器内调用prepareForSegue

Question

这是我注册 UIBarButtonItems 及其选择器函数的代码。

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.

    var edit = UIBarButtonItem(title: "Edit", style: UIBarButtonItemStyle.Plain, target: self, action: Selector("editTruck"))
    let delete = UIBarButtonItem(title: "Delete", style: UIBarButtonItemStyle.Plain, target: self, action: "deleteTruck")
    let menu = UIBarButtonItem(image: UIImage(named: "menu"), style: UIBarButtonItemStyle.Plain, target: self.revealViewController(), action: "rightRevealToggle:")

    self.navigationItem.rightBarButtonItems = [menu,delete,edit]

    self.title = truckName.text

    self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
    self.view.addGestureRecognizer(self.revealViewController().tapGestureRecognizer())
}

func editTruck(){

    println("insdie edittruck")

    self.performSegueWithIdentifier("editTruck", sender: self)

     func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?){
    println("inside prepare")            
        if segue.identifier == "editTruck"{
            let vc = segue.destinationViewController as? UINavigationController
            let topView = vc?.topViewController as! AddTruckViewController
            topView.truckNameValue = name.text!
            topView.totalFuelupsValue = totalFuelups.text!
            topView.totalDistanceTrackedValue = totalDistanceTracked.text!
            topView.truckYearValue = truckYear.text!
            topView.truckMakeValue = truckMake.text!
            topView.truckModelValue = truckModel.text!
            topView.truckImagevalue = truckImage.image!
            topView.engineMakeValue = engineMake.text!
            topView.engineModelValue = engineModel.text!
            topView.horsePowerValue = horsePower.text!
            topView.axleValue = axle.text!
            topView.trailerTypeValue = trailerType.text!
            topView.steerTireMakeValue = steerTireMake.text!
            topView.steerTireModelValue = steerTireModel.text!
            topView.steerTireSizeValue = steerTireSize.text!
            topView.driveTireMakeValue = driveTireMake.text!
            topView.driveTireModelValue = driveTireModel.text!
            topView.driveTireSizeValue = driveTireSize.text!
            topView.transmissionMakeValue = transmissionMake.text!
            topView.transmissionModelValue = transmissionModel.text!
            topView.distanceUnitValue = distanceUnit.text!
            topView.volumeUnitValue = volumeUnit.text!
        }
    }
}

在IB中，我将控件从TruckSpecsViewController(顶部的黄色图标，因为我的按钮是以编程方式创建的)(我上面的代码来自此处)拖动到我想要继续的场景。我将标识符添加到“editTruck”的序列中。在上面的代码中，performSegueWithIdentifier 有效，但prepareForSegue 无效。没有错误或任何东西它永远不会被调用。

任何帮助将不胜感激。

Answer 1

将 prepareForSegue:sender 方法移至与 View Controller 中的 editTruck 方法相同的级别。范围的更改将解决您的问题。

iOS 自动调用 View Controller 上的 prepareForSegue:sender 方法，以响应 Storyboard 中的 segue 或通过在代码中调用 performSegueWithIdentifier:sender: 。

你永远不会自己调用prepareForSegue:sender；您只需在 View Controller 中实现此方法即可。