所以我有一个具有以下接口(interface)的类:#import#import"XMPPStream.h"@interfaceSignInViewController:UIViewController@property(strong,nonatomic)IBOutletUITextField*UserNameTextField;@property(strong,nonatomic)IBOutletUITextField*PassWordTextField;@property(strong,nonatomic)XMPPStream*myStream;-(IBAction)SignInB