Swift-Pure Code Implementation page Segue jump, and parameter passing

The following illustrates an example of how to switch segue pages and pass parameters in the code.


The sample functions are as follows:
1. The main interface is a list (this list is implemented in the code)
2. When you click a list item, the interface will switch to the detail page, and at the same time transfer the value of the changed list item to the detail page.

The effect chart is as follows:
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Implementation steps:
1. Drag a new ViewController into the storyboard as a detail page, and create a new class DetailViewController that inherits ViewController. And it is bound to the view and the controller with the newly created detail page in the storyboard.
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2. In the storyboard, select the detail page and drag and drop the Detail View Controller on the top to the main page for segue association (show detail)
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3. Select the associated line and set segue's Identifier property to "ShowDetailView"
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4. The main interface code ViewController.swift

import UIKit
 
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
     
    var ctrlnames: [String] = ["Task 1", "Task 2", "Task 3"]
    var tableView: UITableView?
     
    override func loadView () {
        super.loadView ()
    }
     
    override func viewDidLoad () {
        super.viewDidLoad ()
        // Create table view
        self.tableView = UITableView (frame: self.view.frame, style: UITableViewStyle.Plain)
        self.tableView! .delegate = self
        self.tableView! .dataSource = self
        // Create a reused cell
        self.tableView! .registerClass (UITableViewCell.self, forCellReuseIdentifier: "SwiftCell")
        self.view.addSubview (self.tableView!)
    }
     
    // In this example, there is only one partition
    func numberOfSectionsInTableView (tableView: UITableView!)-> Int {
        return 1;
    }
     
    // Return the number of table rows (that is, return the number of controls)
    func tableView (tableView: UITableView, numberOfRowsInSection section: Int)-> Int {
        return self.ctrlnames.count
    }
     
    // Create the display content of each unit (create the unit specified by the parameter indexPath)
    func tableView (tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath)
        -> UITableViewCell
    {
        // In order to provide table display performance, the created unit needs to be reused
        let identify: String = "SwiftCell"
        // Cells of the same form are reused and registered at the time of declaration
        let cell = tableView.dequeueReusableCellWithIdentifier (identify, forIndexPath: indexPath)
            as UITableViewCell
        cell.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator
        cell.textLabel? .text = self.ctrlnames [indexPath.row]
        return cell
    }
     
    // UITableViewDelegate method to handle the selected event of the list item
    func tableView (tableView: UITableView !, didSelectRowAtIndexPath indexPath: NSIndexPath!)
    {
        self.tableView! .deselectRowAtIndexPath (indexPath, animated: true)
        var itemString = self.ctrlnames [indexPath.row]
      
        self.performSegueWithIdentifier ("ShowDetailView", sender: itemString)
    }
     
    // In this method, pass parameters to the new page
    override func prepareForSegue (segue: UIStoryboardSegue, sender: AnyObject?) {
        if segue.identifier == "ShowDetailView" {
            let controller = segue.destinationViewController as DetailViewController
            controller.itemString = sender as? String
        }
    }
     
    override func didReceiveMemoryWarning () {
        super.didReceiveMemoryWarning ()
    }
}

5. Detail page code DetailViewController.swift


import UIKit
 
class DetailViewController: UIViewController {
     
    var itemString: String?
 
    @IBOutlet weak var textField: UITextField!
     
    override func viewDidLoad () {
        super.viewDidLoad ()
 
        textField.text = itemString
    }
 
    override func didReceiveMemoryWarning () {
        super.didReceiveMemoryWarning ()
    }
}
Swift-Pure code to achieve page segue jump and parameter passing

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Original address: http://www.cnblogs.com/Free-Thinker/p/4841064.html