Parse Cloud - LiveQueries - iOS 客户端不工作

问题描述

我正在尝试使用 Parse LiveQueries.我使用这个解析引导程序":https://github.com/parse-community/parse-服务器",
我可以看到日志:info: Create new client: 1,
但我只是没有在查询中获得更新，尽管我已经订阅了它.它甚至没有到达 subscription.handle 的处理程序.

config.json:

{"appId": "",主密钥": ""，"应用名称": "","cloud": "./cloud/main","databaseURI": "","publicServerURL": "",//相关的startLiveQueryServer":真，实时查询":{类名":[频道"]},}

AppDelegate.swift:

//初始化解析.让配置 = ParseClientConfiguration {$0.applicationId = self.PARSE_APP_ID$0.server = self.PARSE_SERVER}Parse.initialize(with: 配置)AppDelegate.liveQueryClient = ParseLiveQuery.Client()

订阅代码(iOS Swift):

public static func listenSubscribedChannels(handler: @escaping (_ channel: Channel) -> Void) {var 订阅:订阅?让查询:PFQuery= PFQuery(className: "Channel").whereKey("subscribers", containsIn: [PFUser.current()!.objectId])订阅 = AppDelegate.liveQueryClient!.subscribe(query).handle(Event.updated) { _, channel in处理程序(通道)}}

解决方案

这段代码的问题是你把这段代码 var subscription: Subscription? 放在函数里面.>

该对象必须能够保留其内存地址才能接收事件.

例如.

class SomeClass {var 对象:[PFObject] = []var 订阅:订阅?var 订阅者:ParseLiveQuery.Client！让查询 = PFQuery(className: "Locations")功能开始监听器(){//初始化客户端订阅者 = ParseLiveQuery.Client()//初始化订阅者并开始订阅订阅 =subscriber.subscribe(conversationQuery)//处理事件监听器._ = 订阅?.handleEvent({ (_, event) in切换事件{案例.created(让对象):self.objects.append(object)//做东西默认:break//做其他事情或什么都不做}})}}

从这段代码中可以看出，为了保留Subscription 的内存地址，我将变量放在函数定义之外.

I'm trying to use Parse LiveQueries.I use this Parse "Bootstrap": "https://github.com/parse-community/parse-server",
I can see the logs: info: Create new client: 1,
but I just do not get the update in the query although I have subscribed it. It doesn't even reach the handler of the subscription.handle.

config.json:

{
  "appId": "",
  "masterKey": "",
  "appName": "",
  "cloud": "./cloud/main",
  "databaseURI": "",
  "publicServerURL": "",

  // Relevant
  "startLiveQueryServer": true,
  "liveQuery": {
    "classNames": ["Channel"]
  },
}

AppDelegate.swift:

// Initialize Parse.
let configuration = ParseClientConfiguration {
    $0.applicationId = self.PARSE_APP_ID
    $0.server = self.PARSE_SERVER
}
Parse.initialize(with: configuration)

AppDelegate.liveQueryClient = ParseLiveQuery.Client()

The Subscription Code (iOS Swift):

public static func listenSubscribedChannels(handler: @escaping (_ channel: Channel) -> Void) {
    var subscription: Subscription<PFObject>?

    let query: PFQuery<PFObject> = PFQuery(className: "Channel").whereKey("subscribers", containedIn: [PFUser.current()!.objectId])

    subscription = AppDelegate.liveQueryClient!.subscribe(query).handle(Event.updated) { _, channel in
        handler(channel)
    }
}

解决方案

The problem with this code is that you are placing this code var subscription: Subscription<PFObject>? inside the function.

This object must be able to retain it's memory address in order for it to receive events.

For example.

class SomeClass {
    var objects: [PFObject] = []
    var subscription: Subscription<PFObject>?
    var subscriber: ParseLiveQuery.Client!
    let query = PFQuery(className: "Locations")

    func startListener() {
        // initialize the client
        subscriber = ParseLiveQuery.Client()

        // initialize subscriber and start subscription
        subscription = subscriber.subscribe(conversationQuery)

        // handle the event listenrs.
        _ = subscription?.handleEvent({ (_, event) in
            switch event {
            case .created(let object):
                self.objects.append(object)
                // do stuff

            default:
                break // do other stuff or do nothing
            }
        })
    }
}

As you can see from this code, I've placed the variables outside the function definition in order for the Subscription's memory address to be retained.

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