ios – NSStreamDelegate没有收到NSStreamEvent.HasSpaceAvailable：

概述我让我的代码在另一个项目中工作,在具有以下签名的类中： class ViewController: UIViewController, NSStreamDelegate, UITextFieldDelegate { 然后我将连接移动到它自己的类,所以我可以在每个连接中重用它： class XMPPConnection: NSObject, NSStreamDelegate 当我这样做时,我将所有 我让我的代码在另一个项目中工作,在具有以下签名的类中：

class VIEwController: UIVIEwController,NsstreamDelegate,UITextFIEldDelegate  {

然后我将连接移动到它自己的类,所以我可以在每个连接中重用它：

class XMPPConnection: NSObject,NsstreamDelegate

当我这样做时,我将所有vIEwDIDLoad()代码移动到init()中.我还尝试将该init代码放在一个单独的函数中,并在实例化该类之后调用该函数.这并没有改变任何事情.

我可以在2个项目之间切换,旧的和新的,只是为了确保它不是服务器问题,这样做确认它不是.

每次运行应用程序后,结果都不同.它要么不调用HasspaceAvailable并且只是坐在那里,要么在我的类AppDelegate中的线程1上抛出(lldb)错误：UIResponder,UIApplicationDelegate,FBLoginVIEwDelegate.这个错误可能与Facebook集成有关,但是对于lldb来说,没什么可看的.但是,对于每次运行,与其他项目不同,从不调用HasspaceAvailable.

这是NsstreamDelegate的完整代码,因此没有混淆.该类是一种使用XMPP协议的相当标准的连接方法.

import UIKitimport Foundationclass XMPPConnection: NSObject,NsstreamDelegate { //NSObject    var input : NSinputStream?    var output: NSOutputStream?    //let XMLStream: String = "<stream:stream xmlns:stream='http://etherx.jabber.org/streams' version='1.0' xmlns='jabber:clIEnt' to='mydomain.com' xml:lang='en' xmlns:xml='http://www.w3.org/XML/1998/namespace'>"    let XMLStream: String = "<stream:stream to='mydomain.com' xmlns='jabber:clIEnt' xmlns:stream='http://etherx.jabber.org/streams' version='1.0'>"    var XMLAuth: String?    let XMLStreamEnd: String = "</stream:stream>"    let XMLResource: String = "<iq type='set' ID='bind_1'><bind xmlns='urn:IEtf:params:xml:ns:xmpp-bind'><resource>OnesIDe</resource></bind></iq>"    let XMLSession: String = "<iq type='set' ID='sess_1'><session xmlns='urn:IEtf:params:xml:ns:xmpp-session'/></iq>"    let XMLStartTLS: String = "<starttls xmlns='urn:IEtf:params:xml:ns:xmpp-tls'/>";    var messagesToBeSent:[String] = []    var lastSentMessageID = 0    var lastReceivedMessageID = 0    init(facebookID: String) {        super.init()        let username = "admin@mydomain.com" //should hash device ID        let password = "123456" //hash it        var UTF8AuthStr = "
func application(application: UIApplication,dIDFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {    let conn = XMPPConnection(facebookID: "...")    return true}
\(username)
uNowned(unsafe) var delegate: NsstreamDelegate?
\(password)".dataUsingEnCoding(NSUTF8StringEnCoding)        let Base64Str = UTF8AuthStr!.base64EncodedStringWithOptions(NSDataBase64EnCodingOptions.fromraw(0)!)        XMLAuth = "<auth xmlns='urn:IEtf:params:xml:ns:xmpp-sasl' mechanism='PLAIN'>\(Base64Str)</auth>"        //println(XMLAuth)        self.connectToSocket("mydomain.com",port: 5222)        send(self.XMLStream)        //send(self.XMLStartTLS)        /*send(self.XMLAuth!)        send(self.XMLStream)        send(self.XMLResource)        send(self.XMLSession)*/        //sendMessage("hi")    }    func connectToSocket(host: String,port: Int) {        Nsstream.getStreamsToHostWithname(host,port: port,inputStream: &(self.input),outputStream: &(self.output))        self.input!.delegate  = self        self.output!.delegate = self        self.input!.scheduleInRunLoop(NSRunLoop.currentRunLoop(),forMode: NSDefaultRunLoopMode)        self.output!.scheduleInRunLoop(NSRunLoop.currentRunLoop(),forMode: NSDefaultRunLoopMode)        self.input!.open()        self.output!.open()        println("Connected")        //let bytesWritten = self.output!.write(UnsafePointer(data.bytes),maxLength: data.length)        //println(bytesWritten)    }    //The delegate receives this message when a given event has occurred on a given stream.    func stream(theStream: Nsstream!,handleEvent streamEvent: NsstreamEvent) {        println("Message received")        switch streamEvent {        case NsstreamEvent.None:            println("NsstreamEvent.None")        case NsstreamEvent.OpenCompleted:            println("NsstreamEvent.OpenCompleted")        case NsstreamEvent.HasBytesAvailable:            println("NsstreamEvent.HasBytesAvailable")            if let inputStream = theStream as? NSinputStream {                //println("is NSinputStream")                if inputStream.hasBytesAvailable {                    //println("hasBytesAvailable")                    let bufferSize = 1024                    var buffer = Array<UInt8>(count: bufferSize,repeatedValue: 0)                    var bytesRead: Int = inputStream.read(&buffer,maxLength: bufferSize)                    //println(bytesRead)                    if bytesRead >= 0 {                        lastReceivedMessageID++                        var output: String = Nsstring(bytes: &buffer,length: bytesRead,enCoding: NSUTF8StringEnCoding)                        //println("output is")                        println(output)                    } else {                        println("error")                        // Handle error                    }                }            }        case NsstreamEvent.HasspaceAvailable:            println("NsstreamEvent.HasspaceAvailable")            send(nil) //send next item            //send next message or            //what if there is no next message to send,and instead waiting user input?        case NsstreamEvent.ErrorOccurred:            println("NsstreamEvent.ErrorOccurred")        case NsstreamEvent.EndEncountered:            println("NsstreamEvent.EndEncountered")        default:            println("default")        }    }    func send(message:String?){        if (self.output!.hasspaceAvailable){ //stream ready for input            //println("true hasspaceAvailable")            var data:NSData            var thisMessage:String            if message == nil{ // no message specifIEd                if messagesToBeSent.count != 0{ //messages waiting to be sent                    thisMessage = messagesToBeSent[0]                    data = messagesToBeSent[0].dataUsingEnCoding(NSUTF8StringEnCoding,allowLossyConversion: false)!                    messagesToBeSent.removeAtIndex(0)                }                else{ //no data to be sent                    //no message specifIEd and nothing to be sent                    return                }            }            else{                thisMessage = message!                data = message!.dataUsingEnCoding(NSUTF8StringEnCoding,allowLossyConversion: false)!            }            //println("Sent the following")            wait()            let bytesWritten = self.output!.write(UnsafePointer(data.bytes),maxLength: data.length)            lastSentMessageID++            //println(thisMessage)            //println("Message sent to server and response is")            //println(bytesWritten) //int count        }        else{ //steam busy            println("no space available in stream")            if message != nil{                messagesToBeSent.append(message!)            }        }    }    func sendMessage(message:String,from:String,to:String){        let xmlMessage = "<message to='\(to)@mydomain.com' from='\(from)@mydomain.com' type='chat' xml:lang='en'> <body>\(message)</body></message>"        send(xmlMessage)    }    func wait() {        while true {            //println("waiting")            if lastSentMessageID == lastReceivedMessageID {                break            }            NSRunLoop.currentRunLoop().runUntilDate(NSDate(timeIntervalSinceNow: 0.1));            NSThread.sleepForTimeInterval(0.1)        }    }}

所以我可以看到可能导致这种情况的两件事.要么将它移动到它自己的类中,要么创建它的实例,要么改变继承.考虑到第一种可能性,我正在研究代码的线程：self.input！.scheduleInRunLoop(NSRunLoop.currentRunLoop(),forMode：NSDefaultRunLoopMode)

检查streamStatus.toRaw()后,它显示1是NsstreamStatusopening.我不确定这是否会发生变化.

解决方法 如果XMPPConnection存储在局部变量中,我可以重现问题,
例如

class AppDelegate: UIResponder,UIApplicationDelegate {    var window: UIWindow?    var conn : XMPPConnection!    func application(application: UIApplication,dIDFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {        conn = XMPPConnection(facebookID: "...")        return true    }    // ...}

此方法返回时,实例将被释放.另一方面是流
代表仍指向实例,这会导致崩溃.代表
Nsstream的属性声明为

这是Swift相当于“assign”又名“unsafe_unretained”.因此
设置委托不保留对象,并取消分配对象
不将属性设置为nil(对于弱引用).

如果实例存储在属性中,例如

然后你的代码在我的测试中正常工作.

总结

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