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 class 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它不显示我保存在 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.Now 之前检查对象的可用性它的工作正常试一试并让我知道响应请。

编辑： 我已经编辑了你的代码，现在它工作正常，我听到列出了我所做的所有这些更改。

在LiveCollectionView.swift:

正在声明两个对象并在 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)

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()
   }
}

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)")
}

尝试创建收藏夹按钮以在收藏夹列表中添加项目

trying to create Favorite Button for add items in favorite list

nsuserdefaults

ios

swift

swift2