json - 在 Swift 中使用大缩进调用 json

Question

我有一个异步调用的 JSON 数据，我的问题是，如何从 item:1 调用标题

{
"rss": {
    "channel": {
        "atom:link": "",
        "title": "The Local",
        "link": "http://www.thelocal.se/",
        "description": "Sweden's news in English",
        "language": "en-us",
        "managingEditor": "TheLocal",
        "webMaster": "TheLocal",
        "generator": "TheLocal RSS Feed Generator",
        "item:0": {
            "title": "Knausgård savages the 'Cyclops' Swedes",
            "description": "Norwegian literary star Karl Ove Knausgård has launched an extraordinary attack on the Swedes, damning them as a race of narrow-minded “cyclops” who cannot tolerate ambiguity, have no understanding of literature, and are “full of hate and fear”.",
            "link": "http://www.thelocal.se/20150520/knausgrd-savages-the-cyclops-swedes",
            "pubDate": "2015-05-20 15:25:25",
            "guid": "http://www.thelocal.se/20150520/knausgrd-savages-the-cyclops-swedes"
        },
        "item:1": {
            "title": "Migration Board worker took bribes for passports",
            "description": "A court in Malmö has jailed a former Migration Board worker and his accomplice for taking bribes in exchange for residence permits and passports for asylum seekers desperate to stay in Sweden.",
            "link": "http://www.thelocal.se/20150520/two-found-guilty-in-migration-board-bribery-case",
            "pubDate": "2015-05-20 12:32:46",
            "guid": "http://www.thelocal.se/20150520/two-found-guilty-in-migration-board-bribery-case"
        },
        "item:2": {
            "title": "Two million Swedes design 'house of clicks'",
            "description": "A team of award-winning architects have joined forces with two million Swedes to design the country’s most sought-after home.",
            "link": "http://www.thelocal.se/20150520/two-million-swedes-design-dream-house-of-clicks",
            "pubDate": "2015-05-20 12:01:35",
            "guid": "http://www.thelocal.se/20150520/two-million-swedes-design-dream-house-of-clicks"
        },

我现在无法编译的代码是:

if var jsonArray = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &error) as? Array<NSDictionary> {

                            println("jsonArray: \(jsonArray)")
                            dispatch_async(dispatch_get_main_queue()) {
                                for var i:Int = 0; i < jsonArray.count; i++ {

                                    var title:String = jsonArray["rss"]["item:\(i)"].valueForKey("title") as String

所以我的想法是，我将如上所示调用每个缩进，但现在它说 AnyObject？没有名为 valueForKey 的成员。

我认为这是我从数组字典中调用信息的格式。

有人可以帮助我吗，因为试图向谷歌描述这个问题让我很难解释，因为它很难解释。

Answer 1

首先，您的 JSON 不是 Array，因此在序列化结束时将其转换为 NSDictionary (其中具有 valueForKeyPath 方法)方法。然后只需使用

if let item1title = json?.valueForKeyPath("rss.channel.item:1.title") {
    //here you are ready tu use it
}