Swift:按字母顺序对对象数组进行排序

问题描述

我有这个:

class Movies {
  Name:String
  Date:Int
}

和一系列 [电影].如何按名称的字母顺序对数组进行排序?我试过了:

and an array of [Movies]. How do I sort the array alphabetically by name? I've tried:

movieArr = movieArr.sorted{ $0 <$1 }

和

movieArr = sorted(movieArr)

但这不起作用，因为我没有访问 Movies 的 name 属性.

but that doesn't work because I'm not accessing the name attribute of Movies.

推荐答案

在传递给 sort 的闭包中，比较要作为排序依据的属性.像这样:

In the closure you pass to sort, compare the properties you want to sort by. Like this:

movieArr.sorted { $0.name < $1.name }

或者在你想绕过案例的情况下:

or the following in the cases that you want to bypass cases:

movieArr.sorted { $0.name.lowercased() < $1.name.lowercased() }

旁注:通常只有类型以大写字母开头；我建议使用 name 和 date，而不是 Name 和 Date.

Sidenote: Typically only types start with an uppercase letter; I'd recommend using name and date, not Name and Date.

例如，在操场上:

class Movie {
    let name: String
    var date: Int?

    init(_ name: String) {
        self.name = name
    }
}

var movieA = Movie("A")
var movieB = Movie("B")
var movieC = Movie("C")

let movies = [movieB, movieC, movieA]
let sortedMovies = movies.sorted { $0.name < $1.name }
sortedMovies

sortedMovies 将按顺序 [movieA, movieB, movieC]

Swift5 更新

channelsArray = channelsArray.sorted { (channel1, channel2) -> Bool in
            let channelName1 = channel1.name
            let channelName2 = channel2.name
            return (channelName1.localizedCaseInsensitiveCompare(channelName2) == .orderedAscending)

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