在 Swift 中使用 [AnyObject] 数组过滤 Parse 查询

Question

我在 Swift 中有一个 AnyObject 对象数组（最终，这个数组将通过查询 Parse 数据库来填充）。数组中的每个对象都具有出版物的属性，例如 fullTitle、url 和 journal。如何过滤数组以选择与任何值的搜索字符串匹配的所有对象（例如，fullTitle、url、或期刊包括“福布斯”）？

以下是来自游乐场的示例代码。首先是样本数组：

var publication1 = [
    "fullTitle": "My first blog",
    "url": "www.forbes.com/post1",
    "journal": "Forbes
]

var publication2 = [
    "fullTitle": "My second blog",
    "url": "www.wsj.com/post1",
    "journal": "Wall Street Journal"
]

var publications: [AnyObject] = [publication1, publication2]

那么，过滤函数：

func filterContentForSearchText(searchText: String) {
    let filteredPublications = publications.filter() {
        if let fullTitle = ($0)["fullTitle"] as? String {
            return fullTitle.rangeOfString(searchText) != nil
        } else {
            return false
        }
    }
}

现在，如果我以“first”作为参数调用函数，它应该从数组中返回第一个对象：

println(filterContentForSearchText("first"))

但是，此命令没有结果。我怎样才能解决这个问题？另外，我如何查询对象的 all 字段以获取 searchText，而不仅仅是 fullTitle 字段？

谢谢。

Answer 1

    Swift 3.0
    This is worked for me.
    I want filter data by it's status 0 or 1. 

    var arrRooms:[[String:AnyObject]] = [
        [
            "id": 30 as AnyObject,
            "name": "Earth" as AnyObject,
            "status": 0 as AnyObject,
            "duration": 10 as AnyObject
        ],
        [
            "id": 27 as AnyObject,
            "name": "Mars" as AnyObject,
            "status": 1 as AnyObject,
            "duration": 0 as AnyObject
        ]
    ]

    let StatusPredicate = NSPredicate(format: "status = 1 ")

    let arrFilter:[[String:AnyObject]] = (arrRooms as NSArray).filtered(using: StatusPredicate) as! [[String : AnyObject]]

    print(arrFilter);
    // output [["name": Mars, "status": 1, "id": 27, "duration": 0]]

it may be useful.thanks

Answer 2

这是一个简单的例子，它返回所有字段中的匹配数组：

func filterContentForSearchTextInAllFields(searchText: String) -> [String] {
    var results = [String]()
    for publication in publications {
        for (key, value) in publication {
            if (value as NSString).containsString(searchText) {
                results.append(value)
            }
        }
    }
    return results
}

println(filterContentForSearchTextInAllFields("blog"))

这个只适用于标题：

func filterContentForSearchText(searchText: String) -> [String] {
    var results = [String]()
    for publication in publications {
        if let fullTitle = publication["fullTitle"] {
            if (fullTitle as NSString).containsString(searchText) {
                results.append(fullTitle)
            }
        }
    }
    return results
}

println(filterContentForSearchText("first"))

更新

这是您在 cmets 中询问的版本：

func filterContentForSearchText(searchText: String) -> [[String:String]] {
    var results = [[String:String]]()
    for publication in publications {
        if let fullTitle = publication["fullTitle"] as? String {
            if (fullTitle as NSString).containsString(searchText) {
                results.append(publication as! [String : String])
            }
        }
    }
    return results
}

println(filterContentForSearchText("first"))

您的“行”是字典：在循环中，我们将每个行分配给“publication”变量，因此我们只需获取标题与搜索词匹配的行，然后将其附加到字典数组中。

Answer 3

这是我走的路线。我只是让 Swift 推断类型而不是 AnyObject 数组

var publications = [publication1, publication2]

func searchPublications(seachText: String) -> [[String: String]] {
   let filteredPublications = publications.filter { $0
       for (_, value) in $0 {
           if let found = value.rangeOfString(seachText, options: NSStringCompareOptions.CaseInsensitiveSearch, range: Range<String.Index>(start: value.startIndex, end: value.endIndex), locale: NSLocale.currentLocale()) {
               return true
           }
       }

       return false
   }

   return filteredPublications
}