use of unresolved identifier ‘indexPath’

因此,在搜索Web之后,我设置了变量indexOfSelectedPerson,该变量被赋予indexPath.row的值.我在模拟器中运行应用程序时的问题是prepareForSegue获取indexOfSelectedPerson(0)的初始值,然后在我单击它之后获取所选行的值.因此,当我点击模拟器中的后退按钮并选择另一行时,详细视图会显示我上一次选择的行的信息.

import UIKit

class MasterTableViewController: UITableViewController {

    var people = []
    var indexOfSelectedPerson = 0

    override func viewDidLoad() {
        super.viewDidLoad()

        people = ["Bob","Doug","Jill"]
    }

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

    override func tableView(tableView: UITableView?,numberOfRowsInSection section: Int) -> Int {
        return people.count
    }

    override func tableView(tableView: UITableView!,cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {

        let cell = tableView!.dequeueReusableCellWithIdentifier("personCell",forIndexPath: indexPath) as UITableViewCell

        cell.text = "\(people[indexPath.row])"

        return cell
    }

    override func tableView(tableView: UITableView!,didSelectRowAtIndexPath indexPath: NSIndexPath!)
    {
        indexOfSelectedPerson = indexPath.row
    }


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

        if let mySegue = segue.identifier {

            if mySegue == "personDetails" {

                let detailsVC: DetailTableViewController = segue.destinationViewController as DetailTableViewController

                detailsVC.selectedPersonName = "\(people[indexOfSelectedPerson])"
            }
        }
    }
}

因此,当应用程序首次在模拟器中启动时选择Doug会显示Bob的详细信息,因为indexPathOfSelectedPerson为0.按下后退按钮然后选择Jill会显示Doug的详细信息,因为当我上一次单击Doug时indexPathOfSelectedPerson变为1.我猜测问题源于调用方法的顺序.