Question

我尝试在CollectionViewCell上创建收藏夹按钮，以保存收藏列表中的项目。当我点击收藏夹图标按钮时，它成功地将所选单元格项目添加到收藏列表类的数组中，并且还显示在收藏夹列表中。当我点击收藏夹按钮时，它会根据已保存或未保存的值更改其图像。当我试图在NSUserDefaults中保存喜欢的列表数组时，它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，它不显示我在NSUserDefaults中保存的收藏列表数组中的值，并且还希望根据已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。任何人都可以告诉我如何解决这个问题。或者任何人都可以在我的project.中修复它感谢

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

我已经检查了你的示例项目，我做了一个小小的改动，现在工作正常。

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。现在它正常工作试试看，让我知道响应。

修改我已经编辑了你的代码，现在它工作正常，我通过列出我所做的所有改变来听清楚。

在 LiveCollectionView.swift ：
中
声明两个对象和In viewdidload：

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)

<强> 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() } }

<强> 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添加收藏列表中的项目

1 个答案: