最喜欢的按钮：传递单元格

Question

请帮忙！ 我花了很多时间来创建一个最喜欢的按钮，然后我堆叠：\， 我有一个表格视图单元格，我想创建一个按钮，当我按下按钮时，单元格将出现在收藏选项卡上。 我开始创建该按钮，现在当我按下它时它会改变颜色，并与NSUserDefault 一起存储 .我需要的最后一件事是将单元格传递到我最喜欢的选项卡中。

这是我的代码：

导入 UIKit 导入 AVFoundation 导入 MapKit

class BarProfileTableViewController: UITableViewController,MKMapViewDelegate{


    let Favoritebutton: UIButton = UIButton(type: UIButtonType.Custom)


    Favoritebutton.setImage(UIImage(named: "EmptyHeart.png"), forState: UIControlState.Normal)
    Favoritebutton.setImage(UIImage(named: "FilledHeart.png"), forState: UIControlState.Selected)

    Favoritebutton.addTarget(self, action: #selector(self.button(_:)), forControlEvents: .TouchUpInside)

 var favorites : [String] = [""]

    Favoritebutton.frame = CGRectMake(90, 90, 35, 35)

     //create a new button
        let Favoritebutton: UIButton = UIButton(type: UIButtonType.Custom)
        //set image for button
        Favoritebutton.setImage(UIImage(named: "EmptyHeart.png"), forState: UIControlState.Normal)
        Favoritebutton.setImage(UIImage(named: "FilledHeart.png"), forState: UIControlState.Selected)
        //add function for button
        Favoritebutton.addTarget(self, action: #selector(self.button(_:)), forControlEvents: .TouchUpInside)
        //set frame
        Favoritebutton.frame = CGRectMake(90, 90, 35, 35)

        let barButton = UIBarButtonItem(customView: Favoritebutton)
        //assign button to navigationbar
        self.navigationItem.rightBarButtonItem = barButton

        let defaults = NSUserDefaults.standardUserDefaults()

        let buttonIsSelected = defaults.boolForKey("keyForIsButtonSelected") // If no value exists for this key then false is returned

        Favoritebutton.selected = buttonIsSelected

            }

我的收藏夹视图控制器：

  import UIKit
class FavoritesViewController : UITableViewController {

这是一个例子：

Answer 1

如果你说的是我认为你在说的话，我假设你所说的“最喜欢的标签”是你应用程序的一个部分，其中包含所有用户最喜欢的歌曲的 UITableView，你的目标是将用户决定收藏的歌曲移至favoritesTableView，我将调用它，然后您应该执行以下操作。

在Favoritebutton 操作内：

func favoriteSong (_ sender:UIButton) {

  /* Right here you are going to want to insert the song data that is in the current tableViewCell which the user wishes to add to favorites */

  // I am assuming that your data of all your songs is stored in some sort of array

  // You will have to get the song title, artist, ect data from your cell which you can use something like this to access

  let p: CGPoint = sender.convert(CGPoint.zero, to: songTableView)
  var indexPath: IndexPath = songTableView.indexPathForRow(at: p)!
  let cell = songTableView.cellForRow(at: indexPath)!

  // These are made up arrays that I assume you have something along the lines of in your app and for the purpose of this answer we are going to assume that the song title is your UITableViewCell's 'textLabel' and your song artist is your UITableViewCell's 'detailTextLabel'


  favoritesSongTitleArray.append(cell.textLabel!)
  favoritesSongArtistArray.append(cell.detailTextLabel!)

  // Then I am going to assume (alot of assumptions here :/ ) your 'favoritesTableView' gets its data from these arrays and therefor all you have to do is reload the favoritesTableView like this  

  favoritesTableView.reloadData()

}

你应该在你的 UITableViewController 中有这样的东西用于委托方法

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
  // Put whatever format you wish for the cell here
  let cell =  UITableViewCell(style: .subtitle, reuseIdentifier: "cell")

  cell.textLabel.text = favoritesSongTitleArray[indexPath.row]
  cell.detailTextLabel.text = favoritesSongArtistArray[indexPath.row]

  return cell
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
  return favoritesSongTitleArray.count
}

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {

  return 50
}

然后，用户收藏的单元格应出现在您的favoritesTableView 中。我希望这会有所帮助。

PS：从我看到的代码看来，你还需要调用defaults.synchronize()才能真正保存收藏夹