<分区>
我有三个数组来制作一个 tableView 和第二个 ViewController。一个显示 tableView 上每个部分的标题，一个显示标题，一个显示每个单元格的链接。当我构建并点击其中一个单元格时，我得到:
fatal error: unexpectedly found nil while unwrapping an Optional value
在这一行:
let url = URL(string: websiteURL)!
现在我认为这是因为我的 prepareForSegue 没有工作，这意味着它没有将数组数据发送到第二个 View Controller (ChannelViewController)。 我还通过添加
对此进行了测试print("hello")
到 prepareForSegue 函数并查看“hello”是否出现在调试器中。但它没有。
所以我猜主要问题是让 prepareForSegue 做它应该做的事情。
这是 FirstViewController 代码:
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 : IndexPath = IndexPath()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
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(row: indexPath.section, section: indexPath.row)
performSegue(withIdentifier: "segue", sender: self)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
{
if (segue.identifier == "segue") {
let viewController = segue.destination as! ChannelViewController
// Now you have a pointer to the child view controller.
// You can save the reference to it, or pass data to it.
viewController.websiteURL = links[myIndex.section][myIndex.row]
print("google")
}
}
}
这是第二个 View Controller 代码:
import UIKit
import WebKit
import AVKit
import AVFoundation
class ChannelViewController: UIViewController {
var webView: WKWebView!
var websiteURL = ""
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
webView = WKWebView()
webView.scrollView.isScrollEnabled = false
view.addSubview(webView)
let url = URL(string: websiteURL)!
let req:URLRequest = URLRequest(url: url)
webView.load(req)
webView.translatesAutoresizingMaskIntoConstraints = false
let width = NSLayoutConstraint(item: webView, attribute: .width, relatedBy: .equal, toItem: view, attribute: .width, multiplier: 1.0, constant: 0) //Constraints
let height = NSLayoutConstraint(item: webView, attribute: .height, relatedBy: .equal, toItem: view, attribute: .height, multiplier: 1.0, constant: 0)
view.addConstraints([width,height]) //Constraints
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}