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 UIKit import Foundation class 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 = "\0\(username)\0\(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
例如
func application(application: UIApplication,didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
let 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
uNowned(unsafe) var delegate: NsstreamDelegate?
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
class AppDelegate: UIResponder,UIApplicationDelegate {
var window: UIWindow?
var conn : XMPPConnection!
func application(application: UIApplication,didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
conn = XMPPConnection(facebookID: "...")
return true
}
// ...
}
然后你的代码在我的测试中正常工作.
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