在Swift中过滤字典NSArray [英] Filtering NSArray of dictionaries in Swift

问题描述

我有一系列从RESTful API中提取的字典.我目前正在尝试根据需要过滤掉域"等于"youtube.com"的数据.

I have an array of dictionaries that was pulled from a RESTful API. I currently am trying to filter out the data as needed where the "domain" is equal to "youtube.com".

如何过滤掉?我研究了

results.filter({
    $0["domain"] != "youtube.com"

但不确定如何深入工作.

but not sure how to go deeper to get it to work.

推荐答案

或者，您可以使用Swift数组，将theJSON强制转换为[[String: AnyObject]]而不是NSMutableArray.然后，您不必强制转换results.然后可以使用filter.

Or, you can use Swift array, casting theJSON to [[String: AnyObject]] rather than NSMutableArray. Then, you don't have to cast results. And then you can use filter.

在Swift 1.2中，可能是:

In Swift 1.2, that might be:

let task = session.dataTaskWithURL(url) { data, response, error in
    if error != nil || data == nil {
        print(error)
        return
    }

    var parseError: NSError?
    if let resultObject = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions(rawValue: 0), error: &parseError) as? [[String: AnyObject]] {
        let results = resultObject.filter() { ($0["data"]?["domain"] as? String) != "youtube.com" }
        dispatch_async(dispatch_get_main_queue()) {
            // use results here
        }
    } else {
        print(parseError)
        return
    }

}
task.resume()

或者，在Swift 2中:

Or, in Swift 2:

let task = session.dataTaskWithURL(url) { data, response, error in
    guard data != nil && error == nil else {
        print(error)
        return
    }

    do {
        let resultObject = try NSJSONSerialization.JSONObjectWithData(data!, options: []) as? [[String: AnyObject]]
        let results = resultObject?.filter() { ($0["data"]?["domain"] as? String) != "youtube.com" }
        dispatch_async(dispatch_get_main_queue()) {
            // use results here
        }
    } catch let parseError {
        print(parseError)
    }
}
task.resume()}

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