代码：
if try self.xmppStream!.authenticateWithPassword(password) {出错：
SwiftXMPP/AppDelegate.swift:147:20: Ambiguous reference to member ‘xmppStream’
其中有3处定义：
var xmppStream: XMPPStream?
func xmppStream(sender: XMPPStream?, didReceiveMessage: XMPPMessage?) {
if let message:XMPPMessage = didReceiveMessage {
。。。
}
}
func xmppStream(sender: XMPPStream?, didReceivePresence: XMPPPresence?) {
// println("didReceivePresence")
if let presence = didReceivePresence {
。。。
}即：
此处的变量：xmppStream
除了定义的之外，还有2个函数也叫这个名字：
好像是属于对应的变量的setter的函数
搜：
swift Ambiguous reference to member ‘xmppStream’
swift Ambiguous reference xmppStream
swift didReceivePresence didReceiveMessage
还是没有找到有价值的参考，算了，搞不懂。
直接给变量重命名：
最后改为了：
do{
try curXmppStream!.authenticateWithPassword(password)
print("authentification successful")
}catch{
print(error)
}即可通过编译。
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