[英]Passing Data between View Controllers in Swift
I am trying to convert an app from Objective-C to Swift but I can't find how to pass data between views using Swift. 我正在尝试将应用程序从Objective-C转换为Swift,但是我找不到如何使用Swift在视图之间传递数据。 My Objective-C code is
我的Objective-C代码是
UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
AnsViewController *ansViewController;
ansViewController = [storyBoard instantiateViewControllerWithIdentifier:@"ansView"];
ansViewController.num = theNum;
[self presentViewController:ansViewController animated:YES completion:nil];
What that is doing is it basically takes the variable, theNum, and passes it to the variable, num, on a different view controller. 这样做是从根本上获取变量TheNum,并将其传递给另一个视图控制器上的变量num。 I know this may be an easy question but I am getting pretty confused with Swift so if someone could explain how they changed it to Swift that would be greatly appreciated!
我知道这可能是一个简单的问题,但是我对Swift感到非常困惑,因此,如果有人可以解释他们如何将其更改为Swift,将不胜感激!
Thanks 谢谢
Let's assumed we stand at the firstView go to the DetailView and want passing data from firstView to Detailview. 假设我们站在firstView转到DetailView,并希望将数据从firstView传递到Detailview。 To do that with storyboard, at the firstView we will have a method:
要使用情节提要进行此操作,在firstView处,我们将有一个方法:
override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
if (segue.identifier == "segueTest") {
//Checking identifier is crucial as there might be multiple
// segues attached to same view
var detailVC = segue!.destinationViewController as DetailViewController;
detailVC.toPass = textField.text
}
}
and then into the class of DetailView we declared a variable: 然后在DetailView类中声明一个变量:
var toPass: String!
then you can use the variable toPass
(of course you can change the type of the variable as you want, in this EX I just demo for string type). 那么您可以使用变量
toPass
(当然,您可以根据需要更改变量的类型,在此EX中,我只是演示字符串类型)。
class AnsViewController: UIViewController {
var theNum: Int
override func viewDidLoad() {
super.viewDidLoad()
println(theNum)
}
}
override func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
let viewController = self.storyboard.instantiateViewControllerWithIdentifier("ansView") as AnsViewController
viewController.num = theNum
self.presentViewController(viewController, animated: true, completion: nil)
}
To pass string or any data from one controller to another in swift. 快速将字符串或任何数据从一个控制器传递到另一个控制器。
Follows below steps: 遵循以下步骤:
1) Create property in child controller as var abc:string!
1)在子控制器中将属性创建为
var abc:string!
2) Create object of childcontroller 2)创建子控制器的对象
let storyboard:UIStoryboard()
let viewController: childcontroller = storyboard.instantiateViewControllerWithIdentifier("childcontroller") as! childcontroller
viewController.abc = "hello";
self.navigationController.pushviewController(Controller:viewController animated:true CompletionHandler:nil)
Using tableview,
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
{
let ClubProfileView = self.storyboard?.instantiateViewController(withIdentifier: "CBClubProfileViewController") as! CBClubProfileViewController
let TempCulubDic:NSDictionary =
((ClubsListbyDateDic.object(forKey:((ClubsListbyDateDic.allKeys as! [String]).sorted(by: <)as NSArray).object(at: indexPath.section) as! String) as! NSArray).object(at: indexPath.row))as! NSDictionary
let ClubId:String=(TempCulubDic.value(forKey: "club_id") as? String)!
let CheckIndate:String=(TempCulubDic.value(forKey: "chekin_date") as? String)!
ClubProfileView.ClubID=ClubId
ClubProfileView.CheckInDate = CheckIndate
// self.tabBarController?.tabBar.isHidden=true
ClubProfileView.hidesBottomBarWhenPushed = true
self.navigationController?.pushViewController(ClubProfileView, animated: true)
}
@IBAction func nextbtnpreesd(_ sender: Any) {
let mystring = "2"
performSegue(withIdentifier: "MusicVC", sender: mystring)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destination = segue.destination as? MusicVC{
if let song = sender as? String{
destination.strlablevalie = song
}
}
}
//in MusicVC create string like: //在MusicVC中创建类似以下的字符串:
var strlablevalie:String!
To pass string or any data from one controller to another in swift. 快速将字符串或任何数据从一个控制器传递到另一个控制器。
Follows below steps: 遵循以下步骤:
1) Create variable of type which you want like (String,Int) var test : String! 1)创建想要的类型的变量,例如(String,Int)var test:String!
2) Create object of childcontroller 2)创建子控制器的对象
let vc = self.storyboard?.instantiateViewController(withIdentifier: "Here identifier of your VC") as! (Here Name Of Your Controller)
vc.test = "Hello" (Or any data which you want to pass)
self.navigationController?.pushViewController(VC, animated: true)
That should solve your problem 那应该解决你的问题
Note: if we are using storyboard 注意:如果我们使用情节提要
Step 1: Master controller : 步骤1:主控制器:
// table row which row was selected
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
tableView.deselectRowAtIndexPath(indexPath, animated: true)
println("You selected cell #\(indexPath.row)!")
nextScreenRow = indexPath.row
// get to the next screen
self.performSegueWithIdentifier("dashboard_static_screen_segue", sender: self)
}
and then; 接着;
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if (segue.identifier == "dashboard_static_screen_segue") {
var detailController = segue.destinationViewController as StaticScreens;
detailController.screenNumber = nextScreenRow
}
}// end prepareForSegue
step 2: Detail controller (StaticScreen) 步骤2:明细控制器(StaticScreen)
// set variable into your detail controller
var screenNumber: NSInteger?
println("selected row \(screenNumber!)")
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