如何在Swift 5中从数组字典中获取所有“ title”值

Question

雨燕5

我想从“ 标题”键中获取所有值的数组

ClientConfig config = new ClientConfig();
config.connectorProvider(new ApacheConnectorProvider());
config.property(ClientProperties.PROXY_URI, "proxy_url");
config.property(ClientProperties.PROXY_USERNAME,"user_name");
config.property(ClientProperties.PROXY_PASSWORD,"password");
Client client = ClientBuilder.newClient(config);

我想在选择器视图中使用此标题。

Answer 1

您可以使用compactMap：

let titleArr = arrSportsList.compactMap { $0["title"] }

它将每个字典转换为与键title关联的值，并删除没有title键的字典。

我还建议您创建一个类/结构来存储这些运动，而不要使用字典：

struct Sport {
    let title: String
    // other properties
}

Answer 2

使用compactMap(_:)方法从所有词典中获取标题值。如果任何词典不包含标题键，它将被忽略

var arrSportsList:[[String:String]] = []

// viewDidLoad code
arrSportsList = [
    ["title1":"anothergame"],
    ["title":"Cricket"],
    ["title":"Soccer"],
    ["title":"American Football"],
    ["title":"Ice Hockey"],
    ["title":"Tennis"],
    ["title":"Baseball"],
    ["title":"Basketball"],
    ]


let titleArr = arrSportsList.compactMap { $0["title"] }
print(titleArr)//Cricket,Soccer,American Football,Ice Hockey,Tennis,Baseball,Basketball

Answer 3

最简单的方法

 let titleArr = arrSportsList.compactMap { $0["title"] }

或者您可以遍历字典数组并获得像这样的标题

 let titleArr = Array<String>();
    for dict in arrSportsList {
        if let title = dict["title"] {
             titleArr.append(title);
        }
    }

Answer 4

如果需要进一步了解，可以使用

// Create variable

var arrSportsList:[[String:String]] = []

// viewDidLoad code
arrSportsList = [
    ["title":"Cricket"],
    ["title":"Soccer"],
    ["title":"American Football"],
    ["title":"Ice Hockey"],
    ["title":"Tennis"],
    ["title":"Baseball"],
    ["title":"Basketball"],
    ]

var titleArray: [String]
for (key, value) in arrSportsList {
    print (key) // "title"
    print (value) //Cricket, Soccer, American Football, Ice Hockey, Tennis, Baseball, Basketball
    titleArray.append(value)
}
print (titleArray) //Cricket, Soccer, American Football, Ice Hockey, Tennis, Baseball, Basketball