ios - 可能性数组的(快速)

Question

如何在 swift 语句中使用数组的更多值？

代码:

var array = ["Beer", "Water", "Cola", "Sprite", "Wodka"]

var drinks = "" // The variable drinks updates with a pickerView of the above array

func doSomethingWithArray() {

    if drinks == array[1] {

        print("this is water, so no sugar in it")

    } else if drinks == array[2,3] {

        print("This drink contains sugar")

    } else {
        print("This drink is alcoholic")
}

有没有像在 else if 语句中那样使用多个数组值的简单方法？但这是一种可行的方法。 :)

Answer 1

如果我理解你的问题是正确的，在这种情况下你可以使用 contains。

let myDrink = "Cola"
let sweetDrinks = ["Cola", "Sprite"]

if sweetDrinks.contains(myDrink) {
    print(myDrink, "is a sweet drink")
}

要进行更复杂的检查，请使用 Set。例如:

let myDrinks = Set(["Beer", "Water", "Cola", "Vodka", "Tonic"])
let sweetDrinks = ["Cola", "Sprite", "Tonic"]

// Show myDrinks which are also sweet drinks
let mySweetDrinks = myDrinks.intersect(sweetDrinks)
print(mySweetDrinks) // prints ["Tonic", "Cola"]