Swift 如何在数组中过滤数组

Question

我有一个数组定义为：

var MyArrayOfPaintings = [Painting]()

其中绘画定义为：

struct Painting{
    let Artist: String
    let Name: String
    let ThumbNailURL: String
    var PaintsUsed: [Paint]
}

并且 Paint 定义为：

struct Paint{
    var PaintType: String
    var PaintColorName: String
}

通常情况下，如果我想根据搜索栏中的名称属性过滤此数组，我只需添加一行：

FilteredArray = MyArrayOfPaintings.filter({[=14=].Name.lowercased().contains(searchText.lowercased())})

这很好用，但现在在我的搜索栏中，我还希望能够搜索然后过滤 MyArray，其中 PaintColorName 是搜索值。

我如何根据提供的 PaintColourName 过滤 MyArrayOfPaintings 您实际上如何根据其中的结构数组过滤数组？

Answer 1

与您的问题无关，但您可以使用 localizedCaseInsensitiveContains 而不是小写名称和搜索文本。关于你的问题，你可以过滤包含颜色名称的颜料。

struct Painting {
    let artist: String
    let name: String
    let thumbNailURL: String
    var paints: [Paint]
}

struct Paint {
    var type: String
    var colorName: String
}

var paintings: [Painting] = [.init(artist: "Artist A", name: "Name A", thumbNailURL: "url1", paints: [.init(type: "a", colorName: "white"), .init(type: "b", colorName: "black")]),
                             .init(artist: "Artist B", name: "Name B", thumbNailURL: "url2", paints: [.init(type: "c", colorName: "red"), .init(type: "d", colorName: "green")])]

let searchText = "green"
let filtered = paintings.filter { [=13=].paints.contains {[=13=].colorName.localizedCaseInsensitiveContains(searchText) } }

print(filtered) // [Painting(artist: "Artist B", name: "Name B", thumbNailURL: "url2", paints: [Paint(type: "c", colorName: "red"), Paint(type: "d", colorName: "green")])]

如果你只想得到油漆，你可以使用 flatMap 而不是过滤器，然后使用过滤器而不是包含：

let paints = paintings.flatMap { [=14=].paints.filter {[=14=].colorName.localizedCaseInsensitiveContains(searchText) } }

paints  // [{type "d", colorName "green"}]

Swift 如何在数组中过滤数组

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