[英]How to access userInfo property in from a Notification?
我在調用NotificationCenter
的post方法時有一個方法:
func processMessage(message: CocoaMQTTMessage) {
Log.d("DestinationTopicHandler: handling message")
//message.string: Contains the response of the server
print(message.string!) // print the response (String)
bus.post(name: .DestinationRespReceived, userInfo: [message.string! : String()])
}
這是我的message.string打印:
{ "req_token":"test", "conv_token":"test", "ts":"2017-04-05 12:00:00.123", "code":0, "message":"ACCESO CONCEDIDO", "auth_token":"test", "response":{ "type":"test", "data":{ "destinos":[ { "idDestino":"1", "desDestino":"ASUNCION" }, { "idDestino":"2", "desDestino":"MIAMI" } ] } } }
這是我的post方法聲明:
func post(name: Notification.Name, userInfo info : [AnyHashable : Any]? = nil) {
NotificationCenter.default
.post(name: name, object: nil, userInfo: info)
}
到目前為止一切都還可以。 這是我嘗試訪問userInfo數據的最終方法:
public func responseReceived(_ notification: Notification) {
if processed {
return
}
processed = true
responseReceived = true
Log.i("responseReceived:")
guard let userInfo = notification.userInfo, let msg = userInfo["idDestino"] as? String else {
Log.v("No userInfo found in notification")
callback.onResponseReceived(nil)
return
}
if let json = msg.json {
callback.onResponseReceived(Response_Base(json: json.dictionary))
} else {
Log.v("Could not parse msg")
callback.onResponseReceived(nil)
}
}
問題是我不知道為什么程序總是返回“在通知中找不到userInfo”。 誰能幫我嗎?
我的userInfo輸出是:
[AnyHashable(“ {\\ n \\” req_token \\“:\\”測試\\“,\\ n \\” conv_token \\“:\\”測試\\“,\\ n \\” ts \\“:\\” 2017-04-05 12: 00:00.123 \\“,\\ n \\”代碼\\“:0,\\ n \\”消息\\“:\\” ACCESO CONCEDIDO \\“,\\ n \\” auth_token \\“:\\” jakldsfjalkdfj \\“,\\ n \\”響應\\“:{\\ n \\” type \\“:\\”測試\\“,\\ n \\”數據\\“:{\\ n \\” destinos \\“:[\\ n {\\ n \\” idDestino \\“:\\” 1 \\“,\\ n \\” desDestino \\“:\\” ASUNCION \\“ \\ n},\\ n {\\ n \\” idDestino \\“:\\” 2 \\“,\\ n \\” desDestino \\“:\\” MIAMI \\“ \\ n} \\ n] \\ n} \\ n} \\ n}“):”“]
好...我解決了我的問題...感謝@martin R
問題是這一行:
bus.post(name: .DestinationRespReceived, userInfo: [message.string! : String()])
我沒有意識到,鍵是我的userInfo的第一個元素,第二個元素是值。 所以我像這樣糾正我的userInfo位置的元素:
bus.post(name: .DestinationRespReceived, userInfo: ["msg" : message.string!])
所以...在我的函數responseReceived
中,Received現在是正確的:
guard let userInfo = notification.userInfo, let msg = userInfo["msg"] as? String else {
Log.v("No userInfo found in notification")
callback.onResponseReceived(nil)
return
}
謝謝!
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