// 实现好友状态的获取 - 在线、离线  别的状态自己去写一下判断和回掉就好

.h

 1 /*!
 2  *  @Author Dylan.
 3  *
 4  *  Paresence
 5  */
 6 typedef void (^userGoOnline) (NSString *);
 7 typedef void (^userGoOffline) (NSString *);
 8 
 9 - (void)refreshRosterPResence: (userGoOnline)online
10                       offline: (userGoOffline)offline;

.m

 1 #pragma mark presence
 2 - (void)refreshRosterPresence: (userGoOnline)online
 3                       offline: (userGoOffline)offline {
 4     
 5     self.rosterOnline = online;
 6     self.rosterOffline = offline;
 7 }
 8 
 9 - (void)xmppStream:(XMPPStream *)sender didReceivePresence:(XMPPPresence *)presence {
10     
11     // get presence type
12     NSString * presenceType = [presence type];
13     NSString * userID = [[sender myJID] user];
14     
15     NSString * presencrFromUser = [[presence from] user];
16     if (![presencrFromUser isEqualToString:userID]) {
17         if ([presenceType isEqualToString:@"available"]) {
18             self.rosterOnline(presencrFromUser);
19         } else if ([presenceType isEqualToString:@"unavailable"]) {
20             self.rosterOffline(presencrFromUser);
21         }
22     }
23 }

补上Block回掉申明

1 /*!
2  *  call back block
3  */
4 @property (nonatomic, copy) userGoOnline rosterOnline;
5 @property (nonatomic, copy) userGoOffline rosterOffline;