Question

使用Swift我想使用国家名[0] [1]而不是国家代码对下面的数组进行排序。不知道如何实现这一目标。

let prefixCodes = [["AD", "Andorra"], ["AE", "United Arab Emirates"], ["AF", "Afghanistan"], ["AG", "Antigua & Barbuda"], ["AI", "Anguilla"], ["AL", "Albania"], ["AM", "Armenia"], ["AO", "Angola"], ["AQ", "Antarctica"], ["AR", "Argentina"], ["AS", "American Samoa"], ["AT", "Austria"], ["AU", "Australia"], ["AW", "Aruba"], ["AX", "Åland Islands"], ["AZ", "Azerbaijan"], ["BA", "Bosnia & Herzegovina"], ["BB", "Barbados"], ["BD", "Bangladesh"], ["BE", "Belgium"], ["BF", "Burkina Faso"], ["BG", "Bulgaria"], ["BH", "Bahrain"], ["BI", "Burundi"], ["BJ", "Benin"], ["BL", "St. Barthélemy"], ["BM", "Bermuda"], ["BN", "Brunei"], ["BO", "Bolivia"], ["BQ", "Caribbean Netherlands"], ["BR", "Brazil"], ["BS", "Bahamas"], ["BT", "Bhutan"], ["BV", "Bouvet Island"], ["BW", "Botswana"], ["BY", "Belarus"], ["BZ", "Belize"], ["CA", "Canada"], ["CC", "Cocos (Keeling) Islands"], ["CD", "Congo - Kinshasa"], ["CF", "Central African Republic"], ["CG", "Congo - Brazzaville"], ["CH", "Switzerland"], ["CI", "Côte d’Ivoire"], ["CK", "Cook Islands"], ["CL", "Chile"], ["CM", "Cameroon"], ["CN", "China"], ["CO", "Colombia"], ["CR", "Costa Rica"], ["CU", "Cuba"], ["CV", "Cape Verde"], ["CW", "Curaçao"], ["CX", "Christmas Island"], ["CY", "Cyprus"], ["CZ", "Czech Republic"], ["DE", "Germany"], ["DJ", "Djibouti"], ["DK", "Denmark"], ["DM", "Dominica"], ["DO", "Dominican Republic"], ["DZ", "Algeria"], ["EC", "Ecuador"], ["EE", "Estonia"], ["EG", "Egypt"], ["EH", "Western Sahara"], ["ER", "Eritrea"], ["ES", "Spain"], ["ET", "Ethiopia"], ["FI", "Finland"], ["FJ", "Fiji"], ["FK", "Falkland Islands"], ["FM", "Micronesia"], ["FO", "Faroe Islands"], ["FR", "France"], ["GA", "Gabon"], ["GB", "United Kingdom"], ["GD", "Grenada"], ["GE", "Georgia"], ["GF", "French Guiana"], ["GG", "Guernsey"], ["GH", "Ghana"], ["GI", "Gibraltar"], ["GL", "Greenland"], ["GM", "Gambia"], ["GN", "Guinea"], ["GP", "Guadeloupe"], ["GQ", "Equatorial Guinea"], ["GR", "Greece"], ["GS", "So. Georgia & So. Sandwich Isl."], ["GT", "Guatemala"], ["GU", "Guam"], ["GW", "Guinea-Bissau"], ["GY", "Guyana"], ["HK", "Hong Kong SAR China"], ["HM", "Heard & McDonald Islands"], ["HN", "Honduras"], ["HR", "Croatia"], ["HT", "Haiti"], ["HU", "Hungary"], ["ID", "Indonesia"], ["IE", "Ireland"], ["IL", "Israel"], ["IM", "Isle of Man"], ["IN", "India"], ["IO", "British Indian Ocean Territory"], ["IQ", "Iraq"], ["IR", "Iran"], ["IS", "Iceland"], ["IT", "Italy"], ["JE", "Jersey"], ["JM", "Jamaica"], ["JO", "Jordan"], ["JP", "Japan"], ["KE", "Kenya"], ["KG", "Kyrgyzstan"], ["KH", "Cambodia"], ["KI", "Kiribati"], ["KM", "Comoros"], ["KN", "St. Kitts & Nevis"], ["KP", "North Korea"], ["KR", "South Korea"], ["KW", "Kuwait"], ["KY", "Cayman Islands"], ["KZ", "Kazakhstan"], ["LA", "Laos"], ["LB", "Lebanon"], ["LC", "St. Lucia"], ["LI", "Liechtenstein"], ["LK", "Sri Lanka"], ["LR", "Liberia"], ["LS", "Lesotho"], ["LT", "Lithuania"], ["LU", "Luxembourg"], ["LV", "Latvia"], ["LY", "Libya"], ["MA", "Morocco"], ["MC", "Monaco"], ["MD", "Moldova"], ["ME", "Montenegro"], ["MF", "St. Martin"], ["MG", "Madagascar"], ["MH", "Marshall Islands"], ["MK", "Macedonia"], ["ML", "Mali"], ["MM", "Myanmar (Burma)"], ["MN", "Mongolia"], ["MO", "Macau SAR China"], ["MP", "Northern Mariana Islands"], ["MQ", "Martinique"], ["MR", "Mauritania"], ["MS", "Montserrat"], ["MT", "Malta"], ["MU", "Mauritius"], ["MV", "Maldives"], ["MW", "Malawi"], ["MX", "Mexico"], ["MY", "Malaysia"], ["MZ", "Mozambique"], ["NA", "Namibia"], ["NC", "New Caledonia"], ["NE", "Niger"], ["NF", "Norfolk Island"], ["NG", "Nigeria"], ["NI", "Nicaragua"], ["NL", "Netherlands"], ["NO", "Norway"], ["NP", "Nepal"], ["NR", "Nauru"], ["NU", "Niue"], ["NZ", "New Zealand"], ["OM", "Oman"], ["PA", "Panama"], ["PE", "Peru"], ["PF", "French Polynesia"], ["PG", "Papua New Guinea"], ["PH", "Philippines"], ["PK", "Pakistan"], ["PL", "Poland"], ["PM", "St. Pierre & Miquelon"], ["PN", "Pitcairn Islands"], ["PR", "Puerto Rico"], ["PS", "Palestinian Territories"], ["PT", "Portugal"], ["PW", "Palau"], ["PY", "Paraguay"], ["QA", "Qatar"], ["RE", "Réunion"], ["RO", "Romania"], ["RS", "Serbia"], ["RU", "Russia"], ["RW", "Rwanda"], ["SA", "Saudi Arabia"], ["SB", "Solomon Islands"], ["SC", "Seychelles"], ["SD", "Sudan"], ["SE", "Sweden"], ["SG", "Singapore"], ["SH", "St. Helena"], ["SI", "Slovenia"], ["SJ", "Svalbard & Jan Mayen"], ["SK", "Slovakia"], ["SL", "Sierra Leone"], ["SM", "San Marino"], ["SN", "Senegal"], ["SO", "Somalia"], ["SR", "Suriname"], ["SS", "South Sudan"], ["ST", "São Tomé & Príncipe"], ["SV", "El Salvador"], ["SX", "Sint Maarten"], ["SY", "Syria"], ["SZ", "Swaziland"], ["TC", "Turks & Caicos Islands"], ["TD", "Chad"], ["TF", "French Southern Territories"], ["TG", "Togo"], ["TH", "Thailand"], ["TJ", "Tajikistan"], ["TK", "Tokelau"], ["TL", "Timor-Leste"], ["TM", "Turkmenistan"], ["TN", "Tunisia"], ["TO", "Tonga"], ["TR", "Turkey"], ["TT", "Trinidad & Tobago"], ["TV", "Tuvalu"], ["TW", "Taiwan"], ["TZ", "Tanzania"], ["UA", "Ukraine"], ["UG", "Uganda"], ["UM", "U.S. Outlying Islands"], ["US", "United States"], ["UY", "Uruguay"], ["UZ", "Uzbekistan"], ["VA", "Vatican City"], ["VC", "St. Vincent & Grenadines"], ["VE", "Venezuela"], ["VG", "British Virgin Islands"], ["VI", "U.S. Virgin Islands"], ["VN", "Vietnam"], ["VU", "Vanuatu"], ["WF", "Wallis & Futuna"], ["WS", "Samoa"], ["YE", "Yemen"], ["YT", "Mayotte"], ["ZA", "South Africa"], ["ZM", "Zambia"], ["ZW", "Zimbabwe"]]

提前谢谢。

Answer 1

希望这会对你有所帮助。

let sortedArray = prefixCodes.sort { (first, second) -> Bool in
  return first.last < second.last
}

Answer 2

使用path和shorthand arguments，您可以在2D数组中订购第二个元素，如下所示：

sort

Answer 3

您可以执行以下操作：

prefixCodes.sort { $0[1] < $1[1] }

但是为了更安全，我认为你应该像这样定义一个Country结构：

struct Country {
    let code: String
    let name: String

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

let countries = [Country("AD", "Andorra"), Country("AE", "United Arab Emirates"), Country("BQ", "Caribbean Netherlands")]

print(countries.sort { $0.name < $1.name })

因此，如果您想向国家/地区添加更多详细信息，则无法打破排序结束。

或者，如果您想保持简单但仍然强制执行强类型，则可以使用元组：

let countries = [("AD", "Andorra"), ("AE", "United Arab Emirates"), ("BQ", "Caribbean Netherlands")]

print(countries.sort { $0.1 < $1.1 })

如果在阵列中混合使用不同的元组长度：

let countries = [("AD", "Andorra"), ("toto"), ("tata", "titi", "tutu")]

Swift将返回此错误：

错误：没有更多上下文的表达式类型不明确

Answer 4

您应该使用sort方法对数组进行排序。

让我们首先创建一个未排序的数组：

var arr = [["A", "Hello world"], 
    ["C", "Bye world"], 
    ["B", "idk what to say here"]]

现在让我们看看sort方法需要什么参数。显然它需要关闭以下签名：

([String], [String]) -> Bool

最简单（但不那么开心）的方法是编写一个带有该签名的函数：

func myFunction (first: [String], second: [String]) -> Bool {

}

在该函数中，您需要确定算法是否应该交换这两个参数。如果不应该，则返回true，否则返回false。我想如果你想按字母顺序排序，你应该只比较两个字符串

return first[1] < second[1]

您可以访问索引1处的元素，因为这是存储国家/地区名称的位置，对吗？

然后，使用函数

调用sort

arr = arr.sort(myFunction)

然而，这并不是很开心。为了使这个最开心，你可以这样做：

arr.sort {
    $0[1] < $1[1]
}

好多了！

IOS Swift 2D数组排序

4 个答案: