我正在尝试解析JSON，但收到此错误：
表达式的类型是不明确的，没有更多的上下文
我的代码是：
func jsonParser() {
let urlPath = "http://headers.jsontest.com/"
let endpoint = NSURL(string: urlPath)
let request = NSMutableURLRequest(URL:endpoint!)
let session = NSURLSession.sharedSession()
NSURLSession.sharedSession().dataTaskWithRequest(request){ (data, response, error) throws -> Void in
if error != nil {
print("Get Error")
}else{
//var error:NSError?
do {
let json:AnyObject = try NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions(rawValue: 0)) as? NSDictionary
print(json)
} catch let error as NSError {
// error handling
print(error?.localizedDescription)
}
}
}
//task.resume()
}
这在Xcode 6.4中使用try catch工作正常，但这在Xcode 7中不起作用。
答案 0 :(得分：33)
不要为解码对象声明AnyObject类型，因为您希望它是NSDictionary并且您正在执行转换以执行此操作。
最好为NSJSONSerialization使用零选项而不是随机选项。
在我的示例中，我还使用了自定义错误类型进行演示。
注意，如果您使用的是自定义错误类型，则还必须包含通用的catch以便详尽无遗（在此示例中，简单的向下转换为NSError）。
enum JSONError: String, ErrorType {
case NoData = "ERROR: no data"
case ConversionFailed = "ERROR: conversion from JSON failed"
}
func jsonParser() {
let urlPath = "http://headers.jsontest.com/"
guard let endpoint = NSURL(string: urlPath) else {
print("Error creating endpoint")
return
}
let request = NSMutableURLRequest(URL:endpoint)
NSURLSession.sharedSession().dataTaskWithRequest(request) { (data, response, error) in
do {
guard let data = data else {
throw JSONError.NoData
}
guard let json = try NSJSONSerialization.JSONObjectWithData(data, options: []) as? NSDictionary else {
throw JSONError.ConversionFailed
}
print(json)
} catch let error as JSONError {
print(error.rawValue)
} catch let error as NSError {
print(error.debugDescription)
}
}.resume()
}
与Swift 3.0.2相同：
enum JSONError: String, Error {
case NoData = "ERROR: no data"
case ConversionFailed = "ERROR: conversion from JSON failed"
}
func jsonParser() {
let urlPath = "http://headers.jsontest.com/"
guard let endpoint = URL(string: urlPath) else {
print("Error creating endpoint")
return
}
URLSession.shared.dataTask(with: endpoint) { (data, response, error) in
do {
guard let data = data else {
throw JSONError.NoData
}
guard let json = try JSONSerialization.jsonObject(with: data, options: []) as? NSDictionary else {
throw JSONError.ConversionFailed
}
print(json)
} catch let error as JSONError {
print(error.rawValue)
} catch let error as NSError {
print(error.debugDescription)
}
}.resume()
}
答案 1 :(得分：4)
Apple宣布在这里。
func dataTaskWithRequest(request: NSURLRequest, completionHandler: (NSData?, NSURLResponse?, NSError?) -> Void) -> NSURLSessionDataTask
修复它：
NSURLSession.sharedSession().dataTaskWithRequest(request) { (data, response, error) -> Void in
// Your handle response here!
}
更新：
func jsonParser() {
let urlPath = "http://headers.jsontest.com/"
let endpoint = NSURL(string: urlPath)
let request = NSMutableURLRequest(URL:endpoint!)
NSURLSession.sharedSession().dataTaskWithRequest(request) { (data, response, error) -> Void in
print(error)
}.resume()
}
结果：
可选（错误域= NSURLErrorDomain代码= -1022“无法加载资源，因为应用传输安全策略需要使用安全连接。”UserInfo = {NSUnderlyingError = 0x7f8873f148d0 {错误域= kCFErrorDomainCFNetwork代码= -1022 “（null）”}，NSErrorFailingURLStringKey = http://headers.jsontest.com/，NSErrorFailingURLKey = http://headers.jsontest.com/，NSLocalizedDescription =无法加载资源，因为App＆gt;传输安全策略需要使用安全连接。}）< / p>
希望这有帮助！
答案 2 :(得分：0)
这是使用NSUrlSession解析JSON的最简单方法。
let PARAMS = "{\"params1\":\"%@\",\"Params2\":\"%@\",\"params3\":\"%@\"}"
let URL = "your url here"
在提交按钮上写下此代码。，
let urlStr = String(format: "%@",URL)
let jsonString = String(format:PARAMS, params1value,params2value,params3value )
// Encode your data here
let jsonData = jsonString.data(using:.utf8)
var request = URLRequest(url: URL(string: urlStr)!)
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
//set your method type here
request.httpMethod = "POST"
request.httpBody = jsonData
let configuration = URLSessionConfiguration.default
// create a session here
let session = URLSession(configuration: configuration, delegate: nil, delegateQueue: OperationQueue.main)
let task = session.dataTask(with: request) {(data , response, error) in
if(error != nil){
print("Error \(String(describing: error))")
}
else {
do {
let fetchedDataDictionary = try JSONSerialization.jsonObject(with: data!, options: []) as? NSDictionary
print(fetchedDataDictionary!)
let message = fetchedDataDictionary?["response key here"] as! String
if message == "your response string" {
print(message)
}
else {
self.dataArray = (fetchedDataDictionary?["data"] as! NSArray)
}
}
catch let error as NSError {
print(error.debugDescription)
}
}
}
task.resume()
答案 3 :(得分：0)
对于Swift 4 Web服务Call，使用URLSession的Post方法
func WebseviceCall(){
var request = URLRequest(url: URL(string: "YOUR_URL")!)
request.httpMethod = "POST"
let postString = "PARAMETERS"
request.httpBody = postString.data(using: .utf8)
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else {
print("error=\(error)")
return
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 {
print("statusCode should be 200, but is \(httpStatus.statusCode)")
print("response = \(response)")
}
do {
if let convertedJsonIntoDict = try JSONSerialization.jsonObject(with: data, options: []) as? NSDictionary {
// Print out dictionary
print(convertedJsonIntoDict)
}
} catch let error as NSError {
print(error.localizedDescription)
}
}
task.resume()
}
答案 4 :(得分：-4)
1）让ApiConnection课程进入您的项目.. 进口基金会 ApiConnection类：NSObject {
class func postDataWithRequest(_ dicData:NSDictionary, completionHandler:@escaping (_ response:NSDictionary?,_ status:Bool)->Void)
{
let URL=Foundation.URL(string: Constant.API_URL)
let request=NSMutableURLRequest(url: URL!)
request.httpMethod="POST"
request.addValue(Constant.kApplicationJSON, forHTTPHeaderField:Constant.kContentType)
let data=try? JSONSerialization .data(withJSONObject: dicData, options: JSONSerialization.WritingOptions.prettyPrinted)
request.httpBody=data
//let dispatchTime = dispatch_time(DISPATCH_TIME_NOW, Int64(Double(NSEC_PER_SEC)*5))
//dispatch_after(dispatchTime, dispatch_get_main_queue()) {
let session = URLSession.shared.dataTask(with: request as URLRequest,completionHandler: { (data, response, error) in
if error==nil
{
DispatchQueue.main.async(execute: {
let dicResponse = try? JSONSerialization .jsonObject(with: data!, options: JSONSerialization.ReadingOptions.allowFragments) as! NSDictionary
completionHandler(dicResponse, error==nil)
})
}
else
{
completionHandler(nil, error==nil)
}
})
session.resume()
}
}
**********************************use this in your view controller****************
let dict : NSMutableDictionary = [:];
dict["Your key"] = "your value"
dict["Your key"] = "your value"
dict["Your key"] = "your value"
ApiConnection.postDataWithRequest(dict) { (response, status) in
if(status){
print(response);
else{
print("failed webservice call");
}
}
*************** Swift3.0 ******* *********
var objDic = [String: Any]()
let dic = NSMutableDictionary()
print(dic)
objDic["action"] = ""
objDic["product_id"] = self.peroductid
// arrProduct .addObjects(from: objDic) as! Dictionary
print("\(objDic)")
Alamofire.request(Constant.Webservice_productinfo,
method: HTTPMethod.post,
parameters:objDic as? Parameters,
encoding: JSONEncoding.default,
headers: nil).responseJSON
{
(response:DataResponse<Any>) in
switch(response.result)
{
case .success(_):
if response.result.value != nil
{
let status = response2?.object(forKey: "status") as! String?
if status == "error"{}
//finding the status from response
var response2 = response.result.value as AnyObject?
self.response1 = response.result.value as! NSDictionary
let type =
(self.cartlistarray[0] as!NSDictionary)["base_image"]
cell.productname.text = (self.cartlistarray[0] as!NSDictionary)["name"] as? String
//Store the result value in swift 3.0
UserDefaults.standard.set(userDetail.value(forKey: "email") as? NSString, forKey: "email")
if(UserDefaults.standard.object(forKey:"email") == nil){}
//did select row click the data pass into another view
let ProductListViewController = self.storyboard?.instantiateViewController(withIdentifier: "ProductListViewController") as! ProductListViewController
ProductListViewController.category_id = ((self.bannerarry[0] as? [String : String])?["cat_id"])!
//or else callin from indexpath.row
item = ((cartlistarray[indexpath.row] as? NSDictionary)?.value(forKey:"product_id") as! String?)!
扩展名UIAlertController {
func showErrorAlert(strMesage:NSString,VC:Any)
{
let alert = UIAlertController(title: "Demo App", message: strMesage as String, preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
(VC as AnyObject).present(alert, animated: true, completion: nil)
}
} 扩展UILabel {
func setLabel(strTitle:String)
{
self.backgroundColor = UIColor.clear
self.textColor = UIColor.white
self.textAlignment = NSTextAlignment.left
self.font = UIFont(name: "Avenir-Light", size: 15.0)
self.font = UIFont.italicSystemFont(ofSize: 15)
self.text=strTitle
}
}
//image in to base 64
let image = imageCamera.image
let imageData:NSData = UIImageJPEGRepresentation(image!, 1.0)!as NSData
imageconvert = imageData.base64EncodedString(options: .lineLength64Characters)
base64formate = imageconvert.trimmingCharacters(in:CharacterSet.whitespaces)
print(base64formate)
print data into profle view
let imageurl:String! = SharedManager.sharedInstance().myMutableDict.value(forKey:"profileimg") as? String ?? "123"
let url = URL(string: imageurl)
DispatchQueue.global(qos: .userInitiated).async {
let imageData:NSData = NSData(contentsOf: url!)!
// When from background thread, UI needs to be updated on main_queue
DispatchQueue.main.async {
let image = UIImage(data: imageData as Data)
self.imageview.image = image
}
}
let actionSheetController: UIAlertController = UIAlertController(title: "Magento Extension App", message:response1?.object(forKey: "message") as? String, preferredStyle: .alert)
actionSheetController.addAction(UIAlertAction(title: "Ok", style: .default , handler:{ (UIAlertAction)in
print("Ok button click")
}))
self.present(actionSheetController, animated: true, completion: nil)
}
case .failure(_):
print("error: \(response.result.error)") // original
URL request
break
}
}
************************** objc ******************** *********
NSDictionary *objDic1 = @{@"mode":@"loginUser",
@"email":[result
objectForKey:@"email"],
@"password":@"",
};
// With AFNetworking
AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc]initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
manager.requestSerializer = [AFJSONRequestSerializer serializer];
[manager.requestSerializer setTimeoutInterval:100];
// manager set
[manager.requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[manager POST:WEBSERVICE_CALL_URL parameters:objDic1 progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable result) {
[SVProgressHUD dismiss];
NSLog(@"This s my response %@",result);
NSLog(@"success!");
if ([[result valueForKey:kStatus] isEqualToString:kOK])
{
}
}
failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error)
{
}];
****************SDK LINK*******************************************
https://github.com/AFNetworking/AFNetworking
var userDetail = NSArray()
userDetail = self.response1.value(forKey: "userData") as! NSArray
print(userDetail)
self.tmpDic = userDetail[0] as! NSDictionary
print(self.tmpDic)
var optionsdic = NSDictionary()
optionsdic = self.tmpDic.value(forKey:"options") as! NSDictionary
print(optionsdic)
self.arrayOfKeys = optionsdic.allKeys as NSArray
print(self.arrayOfKeys)
if (self.arrayOfKeys.contains("color"))
{
print("color")
self.colorarray = optionsdic.value(forKey:"color") as! NSArray
print(self.colorarray.count)
for index in 0..<self.colorarray.count
{
var dic = NSDictionary ()
dic = self.colorarray .object(at: index) as! NSDictionary
self.colorarrayobject .add(dic)
print(dic)
}
print(self.colorarrayobject)
}
else {
var defaultarray = NSArray()
defaultarray = optionsdic.value(forKey:"default") as! NSArray
print(defaultarray)
self.element0array = defaultarray[0] as! NSArray
print(self.element0array)
self.dic = self.element0array[0] as! NSDictionary
print(dic)
self.arr5 = self.dic .value(forKey: "values") as! NSArray
print(self.arr5)
for iteams in 0..<self.arr5.count
{
var type = String()
type = ((self.arr5[iteams]as! NSDictionary)["label"]! as? String)!
self.configeresizeaarray.append(type)
}
print("default")
}
}
self.imagearray = self.array[0] as! NSArray
for items in 0..<self.imagearray.count
{
var type = String()
type = ((self.imagearray [items]as! NSDictionary)["image"]! as? String)!
self.cell0imagearray.append(type)
}
self.count = self.imagearray.count as Int
self.configurePageControl()
self.tableView.reloadData()
}
else
{
}
}
else
{
}