Swift 3的Pusher Api在连接时崩溃

Question

我已经使用可可pod 'PusherSwift‘在Swift 3中为我的应用程序集成了Pusher框架。

以下是代码行：

let pusher = Pusher(key: "XXXXXXXXXXXXXXXXXXXX")
// subscribe to channel and bind to event
let channel = pusher.subscribe("test_channel")
let _ = channel.bind(eventName: "my_event", callback: { (data: Any?) -> Void in
    if let data = data as? [String : AnyObject] {
        if let message = data["message"] as? String {
            print(message)
        }
    }
})
pusher.connect() 

这个应用程序在pusher.connect()的- self.delegate?.debugLog?(message: "[PUSHER DEBUG] Network reachable")行崩溃。未显示任何崩溃报告。

open lazy var reachability: Reachability? = {
        let reachability = Reachability.init()
        reachability?.whenReachable = { [unowned self] reachability in
            self.delegate?.debugLog?(message: "[PUSHER DEBUG] Network reachable")
            if self.connectionState == .disconnected || self.connectionState == .reconnectingWhenNetworkBecomesReachable {
                self.attemptReconnect()
            }
        }
        reachability?.whenUnreachable = { [unowned self] reachability in
            self.delegate?.debugLog?(message: "[PUSHER DEBUG] Network unreachable")
        }
        return reachability
    }()

Answer 1

这看起来你可能会被同样的问题described here所困扰。

我认为这是因为PusherConnection对象在可达性闭包中被视为无主，但因为您没有在viewDidLoad函数外部保留对推送器实例的引用，所以connection对象会被清除，而可达性对象则不会。

因此，要解决这个问题，您可能需要在实例化它的函数外部声明pusher对象，这样它就会挂起。例如：

class ViewController: UIViewController, PusherDelegate {
    var pusher: Pusher! = nil
    ...

然后在viewDidLoad中像往常一样执行pusher = Pusher(...。

Answer 2

我不认为你需要使用pusher.connect()。

有关示例detailed docs，请参阅

let pusher = Pusher(key: "YOUR_APP_KEY")
let myChannel = pusher.subscribe("my-channel")

myChannel.bind(eventName: "new-price", callback: { (data: Any?) -> Void in
    if let data = data as? [String : AnyObject] {
        if let price = data["price"] as? String, company = data["company"] as? String {
            print("\(company) is now priced at \(price)")
        }
    }
})

或者，先试试这个，看看它是否连接：

let pusher = Pusher(key: "XXXXXXXXXXXXXXXXXXXX")
pusher.connect() 

然后绑定到您的通道。