SwiftyJSON不會解析JSON字符串，稍後將解析而不會出現問題

Question

我有以下PubNub委託方法按照下面聲明的確切順序進行調用。

public func pubnubClient(client: PubNub!, didSubscribeOnChannels channels: NSArray!) { 
    log.info("Subscribed to \(channels.count) channels") 
    PubNub.sendMessage("{\"type\": \"CHAT_MSG\",\"msgId\": \"1233123\",\"text\": \"hello\",\"username\": \"attheodo\",\"uuid\": \"user_1\",\"associatedPlaceId\": 2}", toChannel:pubnubChannels[0]) 
} 

public func pubnubClient(client: PubNub!, subscriptionDidFailWithError error: PNError!){ 
    log.error("Subscribe Error: \(error)") 
} 

// MARK: Messages 
public func pubnubClient(client: PubNub!, willSendMessage message: PNMessage!) { 

    let payload = JSON(message.message) 
    println(payload) 
    println(payload.rawString()) 
    println(_stdlib_getTypeName(payload)) 
    println(payload["type"]) 


} 

public func pubnubClient(client: PubNub!, didReceiveMessage message: PNMessage!) { 

    let payload = JSON(message.message) 
    println(payload) 
    println(payload.rawString()) 
    println(_stdlib_getTypeName(payload)) 
    println(payload["type"]) 

} 

的問題是SwiftyJSON將無法正確解析由willSendMessage返回的字符串，但儘管我的眼睛，看來他們是完全一樣的將正確地解析由didReceiveMessage返回的一個。它有點讓我發瘋。

請檢查各自的控制檯輸出如下：

// willSendMessage 
{"type": "CHAT_MSG","msgId": "1233123","text": "hello","username":  "attheodo","uuid": "user_1","associatedPlaceId": 2} 

Optional("{\"type\": \"CHAT_MSG\",\"msgId\": \"1233123\",\"text\": \"hello\",\"username\": \"attheodo\",\"uuid\": \"user_1\",\"associatedPlaceId\": 2}") 

_TtV10SwiftyJSON4JSON 

// cannot find payload["type"] 
null 

// didReceiveMessage 
{ 
    "username" : "attheodo", 
    "uuid" : "user_1", 
    "msgId" : "1233123", 
    "associatedPlaceId" : 2, 
    "type" : "CHAT_MSG", 
    "text" : "hello" 
} 

Optional("{\n \"username\" : \"attheodo\",\n \"uuid\" : \"user_1\",\n \"msgId\" : \"1233123\",\n \"associatedPlaceId\" : 2,\n \"type\" : \"CHAT_MSG\",\n \"text\" : \"hello\"\n}") 

_TtV10SwiftyJSON4JSON 

// payload["type"] is ok 
CHAT_MSG 

什麼@＃$！在這裏？請幫助，這將使我的藥>：|

Answer 1

PubNub庫將自動爲您編碼/解碼對象類型（如字典）的JSON。嘗試排除使用第三方JSON庫並使用本地Obj-c詞典。