[英]How to segue array to another view controller in swift?
我試圖將一個填充了Strings的數組從FactsViewController轉移到FavoritesViewController,但出於某種原因,當我向數組中添加一些元素時,運行代碼,並轉移到FavoritesViewController,它說數組中沒有元素。 。
第一視圖控制器:
import UIKit
class FactsViewController: UIViewController {
@IBOutlet var factsLabel: UILabel!
@IBOutlet var nextButton: UIButton!
@IBOutlet var previousButton: UIButton!
@IBOutlet var favoriteButton: UIButton!
var factNumber: Int = 0
var i = 0
var favoriteFactsList: [String] = []
var factsList: [String] = ["Fact 1", "Fact 2", "Fact 3", "Fact 4"]
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
factsLabel?.text = factsList[factNumber]
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// Segue array to Favorites ViewController
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
var destinationViewController: FavoritesViewController = segue.destinationViewController as FavoritesViewController
var arrayToSegue: [String] = favoriteFactsList
destinationViewController.favoriteList = arrayToSegue
}
// Next Button
@IBAction func nextButton(UIButton: AnyObject) {
factNumber++
if(factNumber >= factsList.count - 1) {
factNumber = factsList.count - 1
}
factsLabel.text = factsList[factNumber]
}
// Previous Button
@IBAction func previousButton(UIButton: AnyObject) {
factNumber--
if(factNumber <= 0) {
factNumber = 0
}
factsLabel.text = factsList[factNumber]
}
// Favorite Button
@IBAction func favoriteButton(UIButton: AnyObject) {
favoriteFactsList.append("\(factsList[factNumber])")
NSLog(String(favoriteFactsList.count))
}
// Present Favorites ViewController
@IBAction func favoritesViewController(UIButton: AnyObject) {
let favoritesViewController = self.storyboard?.instantiateViewControllerWithIdentifier("favoritesStoryBoard") as FavoritesViewController
self.presentViewController(favoritesViewController, animated: true, completion: nil)
}
}
第二視圖控制器:
import UIKit
class FavoritesViewController: FactsViewController {
@IBOutlet var favoriteFactsLabel: UILabel!
@IBOutlet var favoriteNextButton: UIButton!
@IBOutlet var favoritePreviousButton: UIButton!
var favoriteList: [String] = [String]()
var favoriteFactNumber: Int = 0
override func viewDidLoad() {
super.viewDidLoad()
factsList = favoriteFactsList
NSLog("\(favoriteFactsList.count)")
if(favoriteList.count == 0) {
favoriteFactsLabel.text = "Sorry, You Have Not Favorited Any Facts Yet"
favoriteNextButton.hidden = true
favoritePreviousButton.hidden = true
}
}
@IBAction func favoriteNextButton(UIButton: AnyObject) {
favoriteFactNumber++
if(favoriteFactNumber >= favoriteList.count - 1) {
favoriteFactNumber = favoriteList.count - 1
}
favoriteFactsLabel.text = favoriteList[favoriteFactNumber]
}
@IBAction func favoritePreviousButton(UIButton: AnyObject) {
favoriteFactNumber--
if(favoriteFactNumber <= 0) {
favoriteFactNumber = 0
}
favoriteFactsLabel.text = favoriteList[favoriteFactNumber]
}
override func favoriteButton(UIButton: AnyObject) {
favoriteList.append("\(factsList[factNumber])")
}
@IBAction func returnButton(UIButton: AnyObject) {
let factsViewController = self.storyboard?.instantiateViewControllerWithIdentifier("factsStoryBoard") as FactsViewController
self.presentViewController(factsViewController, animated: true, completion: nil)
}
}
為什么我的事實陣列不segue
從FactsViewController
到FavoritesViewController
?
您的錯誤在於您用於呈現FavoritesViewController
。 您目前通過presentViewController()
呈現ViewController,而不是segue,因此永遠不會調用該方法。 您可以使用segue標識符從FactsViewController
到FavoritesViewController
一個segue。 你可以稱之為goToFavoritesView
。
// Present Favorites ViewController
@IBAction func favoritesViewController(UIButton: AnyObject) {
self.performSegueWithIdentifier("goToFavoritesView", sender: self)
}
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