[尝试读取从php页面到swift页面的json编码的数据时出现此问题。
这是我正在使用的代码
import Foundation
protocol HomeModelProtocol: class {
func itemsDownloaded(items: NSArray)
}
class HomeModel: NSObject, URLSessionDataDelegate {
//properties
weak var delegate: HomeModelProtocol!
var data = Data()
let urlPath: String = "http://localhost/service.php" //this will be changed to the path where service.php lives
func downloadItems() {
let url: URL = URL(string: urlPath)!
let defaultSession = Foundation.URLSession(configuration: URLSessionConfiguration.default)
let task = defaultSession.dataTask(with: url) { (data, response, error) in
if error != nil {
print("Failed to download data")
}else {
print("Data downloaded") // this work fine
self.parseJSON(data!)
}
}
task.resume()
}
func parseJSON(_ data:Data) {
var jsonResult = NSArray()
print(jsonResult) // this print empty parentheses
print(String(data: data, encoding: .utf8)) // this prints out the array
//the code below throughs an arror
do{
jsonResult = try JSONSerialization.jsonObject(with:data, options:JSONSerialization.ReadingOptions.allowFragments) as! [NSArray] as NSArray
print(jsonResult)
} catch let error as NSError {
print(error)
}
var jsonElement = NSDictionary()
let locations = NSMutableArray()
for i in 0 ..< jsonResult.count
{
jsonElement = jsonResult[i] as! NSDictionary
let location = LocationModel()
//the following insures none of the JsonElement values are nil through optional binding
if let name = jsonElement["Name"] as? String,
let address = jsonElement["Address"] as? String,
let latitude = jsonElement["Latitude"] as? String,
let longitude = jsonElement["Longitude"] as? String
{
location.name = name
location.address = address
location.latitude = latitude
location.longitude = longitude
}
locations.add(location)
}
DispatchQueue.main.async(execute: { () -> Void in
self.delegate.itemsDownloaded(items: locations)
})
}
}
这是我收到的输出:
Data downloaded
(
)
Optional(" \nconnectedinside[{\"name\":\"One\",\"add\":\"One\",\"lat\":\"1\",\"long\":\"1\"},{\"name\":\"Two\",\"add\":\"Two\",\"lat\":\"2\",\"long\":\"2\"},{\"name\":\"One\",\"add\":\"One\",\"lat\":\"1\",\"long\":\"1\"},{\"name\":\"Two\",\"add\":\"Two\",\"lat\":\"2\",\"long\":\"2\"}]")
错误域= NSCocoaErrorDomain代码= 3840“无效值字符2。“ UserInfo = {NSDebugDescription =无效值字符2。}
您会收到此错误,因为您收到的json响应不是数组而是字典。编辑:正如评论中指出的那样,您首先需要在php代码中修复json响应。在“ connectedinside”之后缺少“:”。它看起来应该像这样:{\"connectedinside\":[{\"name\":\"One\",\"add\":"One",...},...]}
我的修正建议:
您应该有两个模型:
struct HomeModelResponse: Codable {
let connectedinside: [LocationModel]
}
// your LocationModel should look like this:
struct LocationModel: Codable {
let name: String
let add: String
let lat: String
let long: String
}
并将您的JSONDecoding代码更改为:
do {
jsonResult = try? JSONDecoder().decode(HomeModelResponse.self, from: data)
print()
} catch let exception {
print("received exception while decoding: \(exception)"
}
然后您可以通过jsonResult.connectedinside访问您的LocationModels>