如何过滤JSON数据解析器

尝试以下操作:

let string = "[{ \"total_amt\" : -10000,\"tran_type\" : \"C3\", \"pay_type\" : \"05\", \"tran_time\" : \"20180125 133122\", \"point_total\" : 0},{\"total_amt\" : -1004,\"tran_type\" : \"C5\", \"pay_type\" : \"05\", \"tran_time\" : \"20180124 163602\", \"point_total\" : 0 }]"

// Convert string to Data
let jsonData = string.data(using: .utf8)!

do {
    // Serialize the json Data and cast it into Array of Dictionary
    let jsonObject = try JSONSerialization.jsonObject(with: jsonData, options: .allowFragments) as? [[String: Any]]

    // Apply filter on `tran_type`
    let tranArr = jsonObject?.filter({ (dictionary) -> Bool in
        dictionary["tran_type"] as? String == "C3"
    })

    print(tranArr)

} catch {
    print(error)
}

筛选结果将位于 tranArr 对象