本文介绍了如何将数据从子视图传递给父视图控制器？在迅速的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我创建了一个活动，当单击其中一个文本字段时，它会弹出一个包含产品列表的子项（警告对话框），但是当我单击列表中的一个项目时，我无法在文本字段上显示它警告被驳回。
I created an activity where when one of the text fields clicked it will pop up a child(alert dialog) with list of product but when i click one item on the list I can't display it on the text filed once the alert dismissed.
这是父视图
import Foundation
import UIKit
class ViewAward: UIViewController{
@IBOutlet var tfMCN: UITextField!
@IBOutlet var tfAmount: UITextField!
@IBOutlet var tfProduct: UITextField!
@IBOutlet var tfTotal: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
let rightAddBarButtonItem:UIBarButtonItem = UIBarButtonItem(title: "Send", style: UIBarButtonItemStyle.Plain, target: self, action: #selector(ViewAward.searchTapped))
self.navigationItem.setRightBarButtonItems([rightAddBarButtonItem], animated: true)
let state = String(ViewPopUpProduct.Product.ProductDescription)
print("My view state:"+state)
self.tfProduct.text = state
tfProduct.addTarget(self, action: #selector(ViewAward.productTapped), forControlEvents: UIControlEvents.TouchDown)
}
func searchTapped(sender:UIButton) {
let alertController = UIAlertController(
title: "Award",
message:"Award successfully posted!",
preferredStyle: UIAlertControllerStyle.Alert)
alertController.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default,handler: nil))
self.presentViewController(alertController, animated: true, completion: nil)
}
func productTapped(textfield: UITextField){
//tfProduct.endEditing(true)
tfProduct.resignFirstResponder()
let popOverVC = UIStoryboard(name:"Main",bundle:nil).instantiateViewControllerWithIdentifier("sbPopUpID") as! ViewPopUpProduct
self.addChildViewController(popOverVC)
popOverVC.view.frame = self.view.frame
self.view.addSubview(popOverVC.view)
popOverVC.didMoveToParentViewController(self)
}
}
当用户点击商品时
import UIKit
class ViewPopUpProduct: UIViewController {
@IBOutlet var tableView: UITableView!
var productDescription = ["Product 1","Product 2","Product 3"]
var productID = ["prdct1","prdct2","prdct3"]
// Global Variables
struct Product {
static var ProductID = String()
static var ProductDescription = String()
}
override func viewDidLoad() {
super.viewDidLoad()
self.showAnimate()
self.view.backgroundColor = UIColor.blackColor().colorWithAlphaComponent(0.4)
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func cancelPopUp(sender: AnyObject) {
self.removeAnimate()
}
func showAnimate()
{
self.view.transform = CGAffineTransformMakeScale(1.3, 1.3)
self.view.alpha = 0.0;
UIView.animateWithDuration(0.25, animations: {
self.view.alpha = 1.0
self.view.transform = CGAffineTransformMakeScale(1.0, 1.0)
});
}
func removeAnimate()
{
UIView.animateWithDuration(0.25, animations: {
self.view.transform = CGAffineTransformMakeScale(1.3, 1.3)
self.view.alpha = 0.0;
}, completion:{(finished : Bool) in
if (finished)
{
self.view.removeFromSuperview()
}
});
}
//Mark - Table View
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.productID.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.tableView.dequeueReusableCellWithIdentifier("cell",forIndexPath: indexPath) as! ProductViewCell
cell.productLabel.text = productDescription[indexPath.row]
return cell
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
tableView.deselectRowAtIndexPath(indexPath, animated: true)
Product.ProductID = String(productID[indexPath.row])
Product.ProductDescription = String(productDescription[indexPath.row])
self.removeAnimate()
}
}
推荐答案
您可以使用协议/代理
这是一个非常直接的解释，没有bs：
Here is a very very straightforward explanation, no bs:https://www.youtube.com/watch?v=guSYMPaXLaw
或者在您的情况下，您也可以使用NSNotificationCenter
Or in your situation you can also use NSNotificationCenter
您可以这样做：
发件人视图控制器可以
let nc = NSNotificationCenter.defaultCenter()
nc.postNotificationName("printValue", object: nil, userInfo: ["value" : "Pass Me this string"])
然后接收者视图控制器可以收听通知。
The receiver view controller then can listen to the notification.
let nc = NSNotificationCenter.defaultCenter()
nc.addObserver(self, selector: #selector(printValue), name: "printValue", object: nil)
func printValue(notification:NSNotification) {
let userInfo:Dictionary<String,String> = notification.userInfo as! Dictionary<String,String>
let item = userInfo["value"]! as String
print(item,self)
}
这篇关于如何将数据从子视图传递给父视图控制器？在迅速的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！