(Swift) fatal error: Index out of range

问题

I have three arrays. One displays headers for each section on the tableView, one displays titles, and one has the links for each cell. When I run this code, I get:

fatal error: Index out of range

Here is what happens after it runs

my code is:

import UIKit

class FirstViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
    var headers = ["Bein Sports", "Sky Sports", "Alkass", "Other"]

    var channels = [["Bein Sports 1","Bein Sports 2","Bein Sports 3","Bein Sports 4","Bein Sports 5","Bein Sports 6","Bein Sports 7","Bein Sports 8","Bein Sports 9","Bein Sports 10","Bein Sports News"],
                              ["Sky Sports 1","Sky Sports 2","Sky Sports 3","Sky Sports 4","Sky Sports 5"],
                              ["Alkass One", "Alkass Two", "Alkass Three", "Alkass Four", "Alkass Five"],
                              ["BT Sports 1", "BT Sports 2", "Real Madrid TV", "Real Madrid TV 2"]]

    var links = [["https://www.google.ca","https://www.facebook.com","https://facebook.com","https://facebook.com","https://facebook.com","https://facebook.com","https://facebook.com","https://facebook.com","https://facebook.com","https://facebook.com","https://facebook.com"],
                 ["https://facebook.com","https://facebook.com","https://facebook.com","https://facebook.com","https://facebook.com"],
                 ["https://facebook.com","https://facebook.com","https://facebook.com","https://facebook.com","https://facebook.com"],
                 ["http://twitter.com","http://facebook.com","http://www.google.com","http://www.instagram.com"]]

    var myIndex = 0

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return channels[section].count
    }

    func numberOfSections(in tableView: UITableView) -> Int {
        return channels.count //Rows
    }

    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return headers[section] //Sections
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        cell.textLabel?.text = channels[indexPath.section][indexPath.row] //TextLabel
        return cell
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        myIndex = [indexPath.section][indexPath.row]
        performSegue(withIdentifier: "segue", sender: self)
    }
}

in the debugger this is the highlighted line:

myIndex = [indexPath.section][indexPath.row]

回答1:

you can store myIndex as IndexPath and using myIndex to get indexPath row and section just like this

     var myIndex : IndexPath = IndexPath()
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

      myIndex = NSIndexPath(row: indexPath.section, section: indexPath.row) as IndexPath
      performSegue(withIdentifier: "segue", sender: self)
 }

来源：https://stackoverflow.com/questions/44731707/swift-fatal-error-index-out-of-range

标签

ios

arrays

swift

indexpath