如何在Swift中使用索引和元素迭代循环 [英] How to iterate a loop with index and element in Swift

问题描述

是否有一个函数可用于遍历数组并具有索引和元素，例如Python的枚举?

Is there a function that I can use to iterate over an array and have both index and element, like Python's enumerate?

for index, element in enumerate(list):
    ...

推荐答案

是.从Swift 3.0开始，如果您需要每个元素的索引及其值，则可以使用

Yes. As of Swift 3.0, if you need the index for each element along with its value, you can use the enumerated() method to iterate over the array. It returns a sequence of pairs composed of the index and the value for each item in the array. For example:

for (index, element) in list.enumerated() {
  print("Item \(index): \(element)")
}

在Swift 3.0之前和Swift 2.0之后，该函数称为enumerate():

Before Swift 3.0 and after Swift 2.0, the function was called enumerate():

for (index, element) in list.enumerate() {
    print("Item \(index): \(element)")
}

在Swift 2.0之前，enumerate是全局函数.

Prior to Swift 2.0, enumerate was a global function.

for (index, element) in enumerate(list) {
    println("Item \(index): \(element)")
}

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