ios - 尝试创建收藏夹按钮以在收藏夹列表中添加项目

Question

我正在尝试在 CollectionViewCell 上创建收藏夹按钮以将项目保存在收藏夹列表中。当我点击收藏图标按钮时，它成功地将选定的单元格项目添加到收藏列表类的数组中，并且还显示在收藏列表中。当我点击最喜欢的按钮时，它会根据是否已保存的值更改其图像。当我试图在 NSUserDefaults 中保存最喜欢的列表数组时，它会保存并在我检索它时显示值。但是当我从模拟器关闭我的应用程序并再次运行时，它不会显示我保存在 NSUserDefaults 中的收藏夹列表数组中的值，并且还想根据已添加或未添加的项目设置按钮图像状态。

Output当我点击收藏夹时。关闭我的应用程序后再次运行。谁能告诉我如何解决这个问题。或者任何人都可以在我的 project. 中修复它谢谢

import UIKit

var url : [NSString] = [
    "https://www.youtube.com/watch?v=9h30Bx4Klxg",
    "https://www.youtube.com/watch?v=ij_0p_6qTss",
    "https://www.youtube.com/watch?v=AJtDXIazrMo",
    "https://www.youtube.com/watch?v=H202k7KfZL0",
    "https://www.youtube.com/watch?v=CGyEd0aKWZE",
    "https://www.youtube.com/watch?v=AtKZKl7Bgu0",
    "https://www.youtube.com/watch?v=4SYlLi5djz0"]

var image : [NSString] = ["1.jpg", "2.jpg", "3.jpg", "4.jpg", "5.jpg", "6.jpg", "7.jpg"]


class LiveCollectionView: UIViewController, UICollectionViewDataSource,UIWebViewDelegate {

    @IBOutlet weak var collectionView: UICollectionView!

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewDidAppear(animated: Bool) {
        let value = UIInterfaceOrientation.Portrait.rawValue
        UIDevice.currentDevice().setValue(value, forKey: "orientation")
    }

    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return url.count
    }

    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell
    {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! LiveCollectionViewCell

        cell.imageView.image = UIImage(named: image[indexPath.row] as String)
        cell.playBt.addTarget(self, action: Selector("webView:"), forControlEvents: UIControlEvents.TouchUpInside)

        cell.playBt.tag = indexPath.row
        cell.heartBt.tag = indexPath.row

        return cell
    }

    func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath){
    }
}

---

import UIKit

class LiveCollectionViewCell: UICollectionViewCell{

var showPlayButton = true

var number = Int()
var secondNumber = Int()

@IBOutlet weak var playBt: UIButton!

@IBOutlet weak var imageView: UIImageView!

@IBOutlet weak var heartBt: UIButton!

@IBAction func heartBt(sender: UIButton) {


    var btn : NSInteger
    btn = sender.tag as NSInteger

    let uValues = url[btn]
    let iValues = image[btn]

    if showPlayButton == true{
        u.append(url[btn])
        i.append(image[btn])

        self.heartBt.setImage(UIImage(named: "rheart"), forState: UIControlState.Normal)
        showPlayButton = false
        print("rHeart xxxxxxxxxxxxxxx")

    }else{

        for check in u {

            number++
            print(number)

            if uValues == check{
                print(u)
                u.removeAtIndex(number-1)
                number = 0
                print("RemoVe at indext path")
                print(u)
                break

            }

        }

        for check2 in i{

            secondNumber++
            print(secondNumber)

            if iValues == check2{
                print(i)
                i.removeAtIndex(secondNumber-1)
                secondNumber = 0
                print("RemoVe at indext path")
                print(i)
                self.heartBt.setImage(UIImage(named: "wHeart"), forState: UIControlState.Normal)
                showPlayButton = true
                print("wHeart ........")
                break

            }

        }

    }

}
}

---

import UIKit
var u : [NSString] = []
var i : [NSString] = []
class FavoriteTvViewController: UIViewController , UICollectionViewDelegate{
    var uV : NSArray = []
    var iV : NSArray = []

    @IBOutlet weak var collectionView: UICollectionView!

    let reuseIdentifier = "cell"

    override func viewDidLoad(){
    }

    override func viewWillAppear(animated: Bool) {
        collectionView.reloadData()
        NSUserDefaults.standardUserDefaults().setObject(u, forKey: "u")
        NSUserDefaults.standardUserDefaults().setObject(i, forKey: "i")
        NSUserDefaults.standardUserDefaults().synchronize()

        uV = NSUserDefaults.standardUserDefaults().arrayForKey("u") as! NSArray
        iV = NSUserDefaults.standardUserDefaults().arrayForKey("i") as! NSArray
        print("uV values.. \(uV)")
        print("iV values.. \(iV)")
    }

    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
    {
        return uV.count
    }

    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> FavoriteTvCollectionViewCell
    {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! FavoriteTvCollectionViewCell

        cell.imageView.image = UIImage(named: iV[indexPath.row] as! String)
        return cell
    }
}

---

import UIKit
class FavoriteTvCollectionViewCell: UICollectionViewCell {
    @IBOutlet weak var imageView: UIImageView!
}

Answer 1

我检查了你的示例项目，我做了一个小改动，现在它工作正常。

override func viewWillAppear(animated: Bool) {
    collectionView.reloadData()
    //You have check for availablity of favorute item before adding to userdefault 
    if u.count > 0 {
        NSUserDefaults.standardUserDefaults().setObject(u, forKey: "u")
        NSUserDefaults.standardUserDefaults().setObject(i, forKey: "i")
        NSUserDefaults.standardUserDefaults().synchronize()
    }


    uV = NSUserDefaults.standardUserDefaults().arrayForKey("u")!
    iV = NSUserDefaults.standardUserDefaults().arrayForKey("i")!
    print("uV values.. \(uV)")
    print("iV values.. \(iV)")
}

在将对象添加到 Userdefault 之前检查对象的可用性。现在它工作正常试一试，请让我知道响应。

编辑:我已经编辑了您的代码，现在它运行良好，我听说列出了我所做的所有这些更改。

1. 在 LiveCollectionView.swift 中:

   声明两个对象并在viewdidload中:

     var MutableArray:NSMutableArray!
     let defaults = NSUserDefaults.standardUserDefaults()
   
   
     override func viewDidLoad() {
        super.viewDidLoad()
   
         MutableArray = NSMutableArray()
         if let HaveUrl = defaults.objectForKey("u"){
            u = HaveUrl.mutableCopy() as! [NSString]
         }
         if let HaveImage = defaults.objectForKey("i"){
            i = HaveImage.mutableCopy() as! [NSString]
         }
   
   
        if let CheckAvailability = defaults.objectForKey("Fav_Unfav"){
           MutableArray = CheckAvailability.mutableCopy() as! NSMutableArray
        }else{
        for var Check in image {
           print(Check)
           MutableArray.addObject("wHeart")
        }
     }
   }
   

   cellForItemAtIndexPath:

   //Add this New Line
   cell.heartBt.setImage(UIImage(named: MutableArray[indexPath.row] as! String), forState: UIControlState.Normal)
   

2. LiveCollectionViewCell.swift:

    class LiveCollectionViewCell: UICollectionViewCell{
   
    var showPlayButton = true
   
    var number = Int()
    var secondNumber = Int()
   
    @IBOutlet weak var playBt: UIButton!
   
    @IBOutlet weak var imageView: UIImageView!
   
    @IBOutlet weak var heartBt: UIButton!
   
    @IBAction func heartBt(sender: UIButton) {
   
   
   var btn : NSInteger
   btn = sender.tag as NSInteger
   
   let uValues = url[btn]
   let iValues = image[btn]
   
   if MutableArray[btn] as! String == "rheart" {
       showPlayButton = false
   }
   
   if showPlayButton == true{
       //Add this Line
       MutableArray.replaceObjectAtIndex(btn, withObject: "rheart")
   
       u.append(url[btn])
       i.append(image[btn])
       self.heartBt.setImage(UIImage(named: "rheart"), forState: UIControlState.Normal)
       showPlayButton = false
       print("rHeart xxxxxxxxxxxxxxx")
   
   }else{
       //Add this Line
       MutableArray.replaceObjectAtIndex(btn, withObject: "wHeart")
   
       for check in u {
   
           number++
           print(number)
   
           if uValues == check{
               print(u)
               u.removeAtIndex(number-1)
               number = 0
               print("RemoVe at indext path")
               print(u)
   
               break
   
           }
   
       }
   
       for check2 in i{
   
           secondNumber++
           print(secondNumber)
   
           if iValues == check2{
               print(i)
               i.removeAtIndex(secondNumber-1)
               secondNumber = 0
               print("RemoVe at indext path")
               print(i)
               self.heartBt.setImage(UIImage(named: "wHeart"), forState: UIControlState.Normal)
               showPlayButton = true
               print("wHeart ........")
               break
   
           }
   
       }
   
   }
      //Set the array to userdefault
       defaults.setObject(MutableArray, forKey: "Fav_Unfav")
       defaults.setObject(u, forKey: "u")
       defaults.setObject(i, forKey: "i")
   
       defaults.synchronize()
      }
   }
   

3. FavoriteTvViewController.swift:

   override func viewWillAppear(animated: Bool) {
      collectionView.reloadData()
   
      if let CheckURL = defaults.objectForKey("u") {
        uV = CheckURL.mutableCopy() as! NSArray
      }
   
      if let CheckImage = defaults.objectForKey("i"){
        iV = CheckImage.mutableCopy() as! NSArray
      }
   
      print("uV values.. \(uV)")
      print("iV values.. \(iV)")
   }