Question

我正在尝试使用AFNetworking进行PUT。我需要在竞赛中发送一组参与者，但是我得到了“在Swift中JSON写入的无效顶级类型”错误。我生成的JSON是完美的，如果我使用REST Client尝试它，一切正常。这是我的代码：

func sendUsers(onComplete: (NSError?) -> Void) {
    var error: NSError?
    var jsonData: NSData = NSJSONSerialization.dataWithJSONObject(self.createDictionaryOfParticipations(), options: NSJSONWritingOptions.allZeros, error: &error)!
    var jsonString: String = NSString(data: jsonData, encoding: NSUTF8StringEncoding)!
    println("Json: \(jsonString)")
    if self.requestManager == nil {
        self.requestManager = AFHTTPRequestOperationManager();
    }
    self.requestManager?.responseSerializer = AFJSONResponseSerializer();
    let requestSerializer = AFJSONRequestSerializer()
    self.requestManager?.requestSerializer = requestSerializer;
    self.requestManager?.requestSerializer.setValue("application/json", forHTTPHeaderField: "Content-Type");
    self.requestManager?.PUT(kParticipantsUrl, parameters: jsonString, success: { (operation: AFHTTPRequestOperation!, object: AnyObject!) -> Void in
        self.persistUsers([])
        onComplete(nil)
        }, failure: { (operation: AFHTTPRequestOperation!, error: NSError!) -> Void in
            onComplete(error)
    })
}

我的方法是创建JSONObject：

func createDictionaryOfParticipations() -> NSArray {
    var dict: NSMutableDictionary = NSMutableDictionary()
    var participants: NSMutableArray = NSMutableArray()
    var savedParticipants: [User] = self.getUsers() as [User]
    for participant: User in savedParticipants {
        var participantDict: NSMutableDictionary = NSMutableDictionary()
        participantDict.setValue(participant.name, forKey: kNameKey)
        participantDict.setValue(participant.firstSurname, forKey: kFirstSurnameKey)
        participantDict.setValue(participant.secondSurname, forKey: kSecondSurnameKey)
        participantDict.setValue(participant.dni, forKey: kDniKey)
        participantDict.setValue(participant.address, forKey: kAddressKey)
        participantDict.setValue(participant.postalCode, forKey: kPostalCodeKey)
        participantDict.setValue(participant.city, forKey: kCityKey)
        participantDict.setValue(participant.province, forKey: kProvinceKey)
        participantDict.setValue(participant.phone, forKey: kPhoneKey)
        participantDict.setValue(participant.email, forKey: kEmailKey)
        participantDict.setValue(participant.code, forKey: kCodeKey)
        participantDict.setValue(participant.prize, forKey: kPrizeKey)
        participants.addObject(participantDict)
    }
    return participants
}

如果我运行应用程序并发送请求，我会收到此错误：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** +[NSJSONSerialization dataWithJSONObject:options:error:]: Invalid top-level type in JSON write'
*** First throw call stack:
(
0   CoreFoundation                      0x0000000103b5df35 __exceptionPreprocess + 165
1   libobjc.A.dylib                     0x00000001037f6bb7 objc_exception_throw + 45
2   CoreFoundation                      0x0000000103b5de6d +[NSException raise:format:] + 205
3   Foundation                          0x000000010349b0ea +[NSJSONSerialization dataWithJSONObject:options:error:] + 264
4   MLB                                 0x00000001031cb23c -[AFJSONRequestSerializer requestBySerializingRequest:withParameters:error:] + 1164
5   MLB                                 0x00000001031c13bd -[AFHTTPRequestSerializer requestWithMethod:URLString:parameters:error:] + 1869
6   MLB                                 0x00000001031e6d14 -[AFHTTPRequestOperationManager PUT:parameters:success:failure:] + 388
7   MLB                                 0x000000010317acf0 _TFC3MLB12UsersManager9sendUsersfS0_FFGSqCSo7NSError_T_T_ + 8656
8   MLB                                 0x0000000103166426 _TFC3MLB22MainMenuViewController9alertViewfS0_FTCSo11UIAlertView20clickedButtonAtIndexSi_T_ + 630
9   MLB                                 0x0000000103166602 _TToFC3MLB22MainMenuViewController9alertViewfS0_FTCSo11UIAlertView20clickedButtonAtIndexSi_T_ + 66
10  UIKit                               0x00000001046773e0 -[UIAlertView _prepareToDismissForTappedIndex:] + 161
11  UIKit                               0x0000000104676ede __35-[UIAlertView _prepareAlertActions]_block_invoke50 + 43
12  UIKit                               0x0000000104670464 -[UIAlertController _dismissAnimated:triggeringAction:triggeredByPopoverDimmingView:] + 89
13  UIKit                               0x00000001047c6540 _UIGestureRecognizerUpdate + 9487
14  UIKit                               0x000000010445eff6 -[UIWindow _sendGesturesForEvent:] + 1041
15  UIKit                               0x000000010445fc23 -[UIWindow sendEvent:] + 667
16  UIKit                               0x000000010442c9b1 -[UIApplication sendEvent:] + 246
17  UIKit                               0x0000000104439a7d _UIApplicationHandleEventFromQueueEvent + 17370
18  UIKit                               0x0000000104415103 _UIApplicationHandleEventQueue + 1961
19  CoreFoundation                      0x0000000103a93551 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
20  CoreFoundation                      0x0000000103a8941d __CFRunLoopDoSources0 + 269
21  CoreFoundation                      0x0000000103a88a54 __CFRunLoopRun + 868
22  CoreFoundation                      0x0000000103a88486 CFRunLoopRunSpecific + 470
23  GraphicsServices                    0x00000001084ca9f0 GSEventRunModal + 161
24  UIKit                               0x0000000104418420 UIApplicationMain + 1282
25  MLB                                 0x000000010319f84e top_level_code + 78
26  MLB                                 0x000000010319f88a main + 42
27  libdyld.dylib                       0x000000010679c145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

我不知道问题出在哪里...我放入JSON的属性的对象是NSObject，我放入json的所有字段都是字符串（字符串类型，而不是NSString），我试过使用NSString，但我仍然得到错误。有任何想法吗？？ THX

Answer 1

您自己正在进行JSON序列化，然后要求AFN再次执行此操作，因此您传递NSString并要求将其序列化为JSON，这将无效。

您应该做的是传递从NSArray返回的createDictionaryOfParticipations：

self.requestManager?.PUT(kParticipantsUrl, parameters: self.createDictionaryOfParticipations(), success:...

在Swift中写入JSON中的顶级类型无效

1 个答案: