原来是 保存的地方用了kvc,

- (void)setBareJid:(XMPPJID *)bareJid

{

if ([self.bareJidisEqualToJID:bareJid options:XMPPJIDCompareBare])

{

return; // No change

}

 

[selfwillChangeValueForKey:@"bareJid"];

[selfwillChangeValueForKey:@"bareJidStr"];

 

self.primitiveBareJid = [bareJid bareJID];

self.primitiveBareJidStr = [bareJid bare];

 

[selfdidChangeValueForKey:@"bareJid"];

[selfdidChangeValueForKey:@"bareJidStr"];

}