我正在快速学习,当触摸TableViewCell时,我遇到了尝试触发segue的问题,这应该将url传递给第二个视图,目前只是在标签中显示它.
我动态创建(我见过人们使用编程方式,这可能是正确的词)每个单元格,所以,在故事板中我没有任何对象链接到另一个视图,除了视图本身……这就是什么我做到了.
所以我将第一个视图控制器连接到第二个视图控制器,并添加了执行segue的代码.
我不确定它是否正确,我的知识来自于没有准确解释我想做什么的教程.
那里有两个视图的代码.
第一个观点
import UIKit
protocol sendInfoDelegate{
func userDidEnterInfo( WhichInfo info : String)
}
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
var tableData = []
@IBOutlet weak var redditListTableView: UITableView!
var selectedCellURL : String?
var delegate : sendInfoDelegate? = nil
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
// change the link to change the json source
getRedditJSON("http://www.reddit.com/.json")
}
//
//Creates a connection via a task (networktask) then parses the json
//
func getRedditJSON(whichReddit : String){
let mySession = NSURLSession.sharedSession()
let url: NSURL = NSURL(string: whichReddit)
let networkTask = mySession.dataTaskWithURL(url, completionHandler : {data, response, error -> Void in
var err: NSError?
var theJSON = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as NSMutableDictionary
let results : NSArray = theJSON["data"]!["children"] as NSArray
dispatch_async(dispatch_get_main_queue(), {
self.tableData = results
self.redditListTableView.reloadData()
})
})
networkTask.resume()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//needs to be implemented
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return tableData.count
}
//creates the whole table
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "MyTestCell")
let redditEntry : NSMutableDictionary = self.tableData[indexPath.row] as NSMutableDictionary
cell.textLabel?.text = redditEntry["data"]!["title"] as? String
cell.detailTextLabel?.text = redditEntry["data"]!["author"] as? String
return cell
}
// action to be taken when a cell is selected
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let redditEntry : NSMutableDictionary = self.tableData[indexPath.row] as NSMutableDictionary
self.selectedCellURL = redditEntry["data"]!["url"] as? String
self.performSegueWithIdentifier("passInfo" , sender: indexPath)
println(self.selectedCellURL!)
if delegate != nil {
let information:String = self.selectedCellURL!
println("ciao")
delegate?.userDidEnterInfo(WhichInfo: information)
self.navigationController?.popViewControllerAnimated(true)
}
第二种观点
import UIKit
class WebPageController : UIViewController, sendInfoDelegate {
var infoFromSVC: String?
@IBOutlet weak var labelVC: UILabel!
func userDidEnterInfo(WhichInfo info: String) {
self.infoFromSVC = info
labelVC.text = infoFromSVC
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "passInfo"{
let firstVController : ViewController = segue.destinationViewController as ViewController
firstVController.delegate = self
}
}
}
谢谢.
最佳答案 要将任何数据传递给第二个视图控制器,您需要在第一个视图控制器中实现prepareForSegue(segue:UIStoryboardSegue,sender:AnyObject?)方法,并通过segue.destinationViewController对象将任何数据传递给第二个视图控制器.
例如
// this method must be in first view controller
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "passInfo" {
var secondViewController : SecondViewController = segue.destinationViewController as SecondViewController
var indexPath = self.tableview.indexPathForSelectedRow() //get index of data for selected row
secondViewController.data = self.dataArray.objectAtIndex(indexPath.row) // get data by index and pass it to second view controller
}
}
在第二个视图控制器中获取数据的代码
override func viewDidLoad() {
super.viewDidLoad()
self.label.text = self.data
}
必须将数据变量定义为第二个视图控制器的属性.