替换Swift 3中数组的indexOf（_ :)方法 [英] Replacement for array's indexOf(_:) method in Swift 3

问题描述

在我的项目中（用Swift 3编写）我想使用 indexOf（_：）方法（存在于Swift 2.2中）从数组中检索元素的索引，但是我找不到任何替代品。

In my project (written in Swift 3) I want to retrieve index of an element from array using indexOf(_:) method (existed in Swift 2.2), but I cannot find any replacement for that.

在Swift 3或类似的任何行为中，是否有任何替代方法？

Is there any good replacement for that method in Swift 3 or anything that act similar?

更新

我忘记提及我想在自定义对象中搜索。在代码完成时，我没有在输入'indexof'时得到任何提示。但是，当我尝试获取类似 Int 类型的构建索引时，代码完成工作，我可以使用 index（of :) 方法。

I forget to mention that I want to search in custom object. In code completion I haven't got any hints when typing 'indexof'. But when I try to get index of build in type like Int code completion works and I could use index(of:) method.

推荐答案

indexOf（_：）已重命名为符合 Equatable 的类型的 index（of：）。您可以将任何类型符合 Equatable ，它不仅适用于内置类型：

indexOf(_:) has been renamed to index(of:) for types that conform to Equatable. You can conform any of your types to Equatable, it's not just for built-in types:

struct Point: Equatable {
    var x, y: Int
}

func == (left: Point, right: Point) -> Bool {
    return left.x == right.x && left.y == right.y
}

let points = [Point(x: 3, y: 5), Point(x: 7, y: 2), Point(x: 10, y: -4)]
points.index(of: Point(x: 7, y: 2)) // 1

带有闭包的indexOf（_：）已重命名为 index（其中:) / code>：

indexOf(_:) that takes a closure has been renamed to index(where:):

[1, 3, 5, 4, 2].index(where: { $0 > 3 }) // 2

// or with a training closure:
[1, 3, 5, 4, 2].index { $0 > 3 } // 2

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