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首页 > 解决方案 > IOS Parse LiveQuery：错误处理消息：可选（POSIXErrorCode：软件导致连接中止）

swift - IOS Parse LiveQuery：错误处理消息：可选（POSIXErrorCode：软件导致连接中止）

问题描述

我在 SwiftUI 中开发了一个应用程序，我还使用 Parse LiveQuery 聊天。聊天实时完美运行，直到应用程序进入后台或手机屏幕关闭。如果我收到新消息的通知并从通知中打开应用程序，则 LiveQuery 停止工作并收到错误消息：“解析 LiveQuery：错误处理消息：可选（POSIXErrorCode：软件导致连接中止）”

我注册了 Message 类

class Message: PFObject, PFSubclassing {
    @NSManaged var message   : String
    @NSManaged var receiver  : PFObject
    @NSManaged var thread_id : PFObject
    @NSManaged var produs    : PFObject
    @NSManaged var sender    : PFObject
    @NSManaged var picture   : PFObject

    class func parseClassName() -> String {
        return "Message"
    }
}

在 ChatView 上，我有 .onReceive，我在其中启动聊天和 liveQuery 功能

                        var messagesQuery: PFQuery<Message> {
                            return (Message.query()?
                                        .whereKey("thread_id", equalTo: self.mainThread_obj)
                                        .order(byDescending: "createdAt")) as! PFQuery<Message>
                        }
                        self.StartMessagesLiveQuery(messagesQuery: messagesQuery)

函数 StartMessagesLiveQuery 是：

 let subscription: Subscription<Message> = Client.shared.subscribe(messagesQuery)        
        subscription.handle(Event.created) { query, object in
            print("Live Query Trigered")
            print(object)
            DispatchQueue.global(qos: .background).async {
                    ///reading object and appending to array}}

唯一的问题是从通知打开应用程序时。

我有什么方法可以强制 ParseLiveQuery 重新连接？

错误堆栈：

2021-03-03 10:15:47.442021+0200 App[35496:6350370] [connection] nw_read_request_report [C2] Receive failed with error "Software caused connection abort"
2021-03-03 10:15:47.449044+0200 App[35496:6350370] [connection] nw_read_request_report [C3] Receive failed with error "Software caused connection abort"
2021-03-03 10:15:47.449291+0200 App[35496:6350370] [connection] nw_read_request_report [C1] Receive failed with error "Software caused connection abort"
2021-03-03 10:15:47.455008+0200 App[35496:6350370] [connection] nw_flow_add_write_request [C2.1 52.1.38.170:443 failed channel-flow (satisfied (Path is satisfied), viable, interface: en0, ipv4, dns)] cannot accept write requests
2021-03-03 10:15:47.455055+0200 App[35496:6350370] [connection] nw_write_request_report [C2] Send failed with error "Socket is not connected"
2021-03-03 10:15:47.455815+0200 App[35496:6350657] ParseLiveQuery: Error processing message: Optional(POSIXErrorCode: Software caused connection abort)
2021-03-03 10:15:47.456612+0200 App[35496:6350370] Task <F6A87098-D5D3-444B-B656-D1999D5089D1>.<44> HTTP load failed, 42/0 bytes (error code: -1005 [1:53])
2021-03-03 10:15:47.462120+0200 App[35496:6350657] Task <F6A87098-D5D3-444B-B656-D1999D5089D1>.<44> finished with error [-1005] Error Domain=NSURLErrorDomain Code=-1005 "The network connection was lost." UserInfo={_kCFStreamErrorCodeKey=53, NSUnderlyingError=0x282d11830 {Error Domain=kCFErrorDomainCFNetwork Code=-1005 "(null)" UserInfo={NSErrorPeerAddressKey=<CFData 0x280174aa0 [0x20a814660]>{length = 16, capacity = 16, bytes = 0x100201bb344692570000000000000000}, _kCFStreamErrorCodeKey=53, _kCFStreamErrorDomainKey=1}}, _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask <F6A87098-D5D3-444B-B656-D1999D5089D1>.<44>, _NSURLErrorRelatedURLSessionTaskErrorKey=(
    "LocalDataTask <F6A87098-D5D3-444B-B656-D1999D5089D1>.<44>"
), NSLocalizedDescription=The network connection was lost., NSErrorFailingURLStringKey=https://site.b4a.app/classes/_User, NSErrorFailingURLKey=https://site.b4a.app/classes/_User, _kCFStreamErrorDomainKey=1}
2021-03-03 10:15:47.462237+0200 App[35496:6350657] [Error]: The network connection was lost. (Code: 100, Version: 1.19.1)
2021-03-03 10:15:47.462335+0200 Bazar[35496:6350657] [Error]: Network connection failed. Making attempt 1 after sleeping for 1.588128 seconds.

在此之后，网络连接恢复并且应用程序正常运行，只有 LiveQuery 不工作。

标签： swiftparse-platformswiftuiparse-live-query

解决方案

我想我已经解决了。我修改了函数 StartMessagesLiveQuery：

func StartMessagesLiveQuery(messagesQuery: PFQuery<Message>){}

在我拥有的功能内部：

let subscription: Subscription<Message> = Client.shared.subscribe(messagesQuery) 
subscription!.handle(Event.created) { query, object in ... }

现在我已经修改并放入了类

var subscription: Subscription<Message>?
 var subscriber: ParseLiveQuery.Client!

在我修改过的函数中：

subscriber = ParseLiveQuery.Client()
subscription = subscriber.subscribe(messagesQuery)

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