编译时数组元素的数量

Question

我想知道编译时 Array 元素的数量：

let sections = ["A","B","C"]

// I want fill later this Array with Arrays of type Product
var productsInSection = [[Product]](count:number of Array elements from sections array, repeatedValue:[])

我的问题是我可以使用什么：“sections 数组中的数组元素数” 所以我不必看，如果我随时改变

let sections = ["A","B","C","D"]

Answer 1

我不明白你为什么需要“编译时间”。

但我认为count property 足以满足您的需求：

let sections = ["A","B","C"]
var productsInSection = [[Product]](count:sections.count, repeatedValue:[])

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例如：

private let _indexSectionTitles = ["A","B","C","D","E","F","G","H","I","J","K","L","M", "N","O","P","Q","R","S","T","U","V","W","X","Y","Z", "Ä","Ö","Ü", "#" ]

class MyClass{
    let indexSectionTitles = _indexSectionTitles
    var productsInSection = [[GlobalProduct]](count: _indexSectionTitles.count, repeatedValue: [])
}