试图创建喜爱的按钮,以便在喜爱的列表中添加项目[英] trying to create Favorite Button for add items in favorite list

本文是小编为大家收集整理的关于试图创建喜爱的按钮,以便在喜爱的列表中添加项目的处理方法,想解了试图创建喜爱的按钮,以便在喜爱的列表中添加项目的问题怎么解决?试图创建喜爱的按钮,以便在喜爱的列表中添加项目问题的解决办法?那么可以参考本文帮助大家快速定位并解决问题。

问题描述

我正在尝试在 CollectionViewCell 上创建收藏按钮,以将项目保存在收藏列表中.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,并显示在收藏列表中.当我点击收藏按钮时,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.但是当我从模拟器中关闭我的应用程序并再次运行时,它不会显示我保存在 NSUserDefaults 中的收藏列表数组中的值,并且还想根据是否已添加的项目设置按钮图像状态.

输出 当我点击收藏时.并在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 项目中修复它.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){
    }
}
<小时>
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

            }

        }

    }

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

推荐答案

我已经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)")
}

在将其添加到 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:我已经编辑了你的代码,现在它工作正常,我听到列出我所做的所有更改.

  1. 在 LiveCollectionView.swift:

    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)")
    }
    

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