使用自定義數組的Swift繼承

Question

class RecipeBrain: NSObject {
    var name: String
    var pictureUrl: String
    var likes = 0
    var ingredients: [Ingredient]
    var method: [String]

    init(name: String, pictureUrl: String, ingredients: [Ingredient], method: [String]) {
        self.name = name
        self.pictureUrl = pictureUrl
        self.ingredients = ingredients
        self.method = method
    }
}

class Ingredient{
    var name: String
    var quantity: Double
    var unit: String

    init(name: String, quantity: Double, unit: String) {
        self.name = name
        self.quantity = quantity
        self.unit = unit
    }
}

class AddRecipe {
    var recipeBrain = [RecipeBrain]()
    var ingredients = [Ingredient]()
    var ingredient = Ingredient(name: "apple", quantity: 1.0, unit: "Kg")
    ingredients.append(ingredient)
    var recipe1 = RecipeBrain(name: "Recipe1", pictureUrl: "nil", ingrexdients: ingredients, method: ["Method"])
    recipeBrain.append(recipe1)
}

我正在嘗試在Swift中構建一個配方應用程序。 問題是為它創造成分，我需要一個字符串，雙，字符串。

我的想象：一種成分是一系列成分。 並創建一個新的配方，我只是將它添加到recipeBrain

主要問題：當我嘗試將新配方附加到recipeBrain數組時它表示沒有聲明recipe1。

（AddRecipe類的目的只是使用靜態數據進行測試）

我將它更改為recipeBrain.append（recipe1）但我仍然得到錯誤：預期聲明，當我嘗試追加時與成分相同

Answer 1

您正嘗試將配方和成分對象附加到AddRecipe類主體的數組中，但您不能。

如果你在方法的主體中這樣做，一切都會好的，例如在init（）方法中：

class AddRecipe {
var recipeBrain = [RecipeBrain]()
var ingredients = [Ingredient]()

init()
{
    var ingredient = Ingredient(name: "apple", quantity: 1.0, unit: "Kg")
    ingredients.append(ingredient)
    var recipe1 = RecipeBrain(name: "Recipe1", pictureUrl: "nil", ingredients: ingredients, method: ["Method"])
    recipeBrain.append(recipe1)
}

Answer 2

您收到錯誤消息，因為您已嘗試在類聲明中編寫代碼。 您只能在類聲明中直接聲明屬性，函數，枚舉和其他類。 代碼，例如ingredients.append(ingredient)需要進入函數內部。

我建議您將此代碼移動到RecipeBrain類的類函數中（或者確實將其放在其他地方，例如視圖控制器，但您還沒有顯示應用程序的結構）：

class RecipeBrain: NSObject {
    var name: String
    var pictureUrl: String
    var likes = 0
    var ingredients: [Ingredient]
    var method: [String]

    init(name: String, pictureUrl: String, ingredients: [Ingredient], method: [String]) {
        self.name = name
        self.pictureUrl = pictureUrl
        self.ingredients = ingredients
        self.method = method
    }

    class func addRecipe() -> [RecipeBrain] {
        var recipeBrain = [RecipeBrain]()
        var ingredients = [Ingredient]()
        let ingredient = Ingredient(name: "apple", quantity: 1.0, unit: "Kg")
        ingredients.append(ingredient)
        let recipe1 = RecipeBrain(name: "Recipe1", pictureUrl: "nil", ingredients: ingredients, method: ["Method"])
        recipeBrain.append(recipe1)
        return recipeBrain
    }
}

現在，可以說let recipeBrain = RecipeBrain.addRecipe()和recipeBrain將陣列RecipeBrain含有單個RecipeBrain