从Struct中删除项目（Swift）

Question

I have a struct

struct FavoriteSong {

    var title: String
    var artist: String

    init(title : String, artist : String) {
        self.title = title
        self.artist = artist
    }

    init?(dictionary : [String:String]) {
        guard let title = dictionary["title"],
            let artist = dictionary["artist"] else { return nil }
        self.init(title: title, artist: artist)
    }

    var propertyListRepresentation : [String:String] {
        return ["title" : title, "artist" : artist]
    }
}


var favoriteSongs: [FavoriteSong] = [

];

By pressing a UIButton , an object is added to the struct

favoriteSongs.append(FavoriteSong(title: songs[thisSong].title, artist: songs[thisSong].artist))

But, I want another UIButton that removes the object from the struct. Something like this:

favoriteSongs.remove(FavoriteSong(title: songs[thisSong].title, artist: songs[thisSong].artist))

I'm using a UITableView to display the information. How would I do this?

Answer 1

Find the index of object and remove it, which matches your song title and artist

let index = favoriteSongs.index{ $0.title == songs[thisSong].title && $0.artist == songs[thisSong].artist}
if let index = index {
    favoriteSongs.remove(at: index)
}

Answer 2

struct FavoriteSong : Equatable{

public static func ==(lhs: FavoriteSong, rhs: FavoriteSong) -> Bool {
    return lhs.title == rhs.title &&
            lhs.artist == rhs.artist
  }
}

You have to add extension to Array to delete object using Equatable

extension Array where Element: Equatable {

// Remove first collection element that is equal to the given `object`:
mutating func remove(object: Element) {
    if let index = index(of: object) {
        remove(at: index)
    }
  }
}

And then you can use some thing like this

favoriteSongs.remove(FavoriteSong(title: songs[thisSong].title, artist: songs[thisSong].artist))