ios - firebase observeeventtype jsqmessagecollectionview avatar -


i'm going show avatar image of users within conversation. used jsqmessageviewcontroller, function below should used achieve goal. however, observeeventtype seems out function , not being called, , there nil(myuserimage or otheruserimage) in return. crash appear. how can photo url of different users in firebase , return expected avatar image? thank you!

    - (id<jsqmessageavatarimagedatasource>)collectionview:(jsqmessagescollectionview *)collectionview avatarimagedataforitematindexpath:(nsindexpath *)indexpath {     jsqmessage *message = [self.msgarray objectatindex:indexpath.item];     if([message.senderid isequaltostring:self.senderid]){         nsstring *myuserid = [firauth auth].currentuser.uid;         __block nsstring *myuserimage;         nslog(@"uid : %@",myuserid);         [[_photoref child:@"users"] observeeventtype:firdataeventtypevalue withblock:^(firdatasnapshot *snapshot) {             nslog(@"my key : %@",snapshot.key);             if([snapshot.key isequaltostring:myuserid]){                 nslog(@"snapshot value : %@", snapshot.value);                 myuserimage = snapshot.value[@"photo"];             }         }];         nsurl *url = [nsurl urlwithstring:myuserimage];         nsdata *data = [nsdata datawithcontentsofurl:url];         self.myuserimage= [[uiimage alloc] initwithdata:data];         return [jsqmessagesavatarimagefactory avatarimagewithimage:self.myuserimage diameter:15];     }     else{         nsstring *otheruserid = message.senderid;         __block nsstring *otheruserimage;         nslog(@"other userid is: %@",otheruserid);         [[_photoref child:@"users"]observeeventtype:firdataeventtypevalue withblock:^(firdatasnapshot *snapshot) {             nslog(@"other user's key is: %@", snapshot.key);             if([snapshot.key isequaltostring:otheruserid]){                 nslog(@"snapshot value is: %@", snapshot.value);                 otheruserimage = snapshot.value[@"photo"];             }         }];         nsurl *url = [nsurl urlwithstring:otheruserimage];         nsdata *data = [nsdata datawithcontentsofurl:url];         self.otheruserimage= [[uiimage alloc] initwithdata:data];         return [jsqmessagesavatarimagefactory avatarimagewithimage:self.otheruserimage diameter:15];     } }

from best can tell looks need pulling data firebase before method gets called. creating struct matches data structure , being able pull information datasource presumably array of these structs you've created.

an implementation i'd recommend exploring use library sdwebimage manage async call , let set default avatar while network request , image rendering happen. still need url fetched database before method gets called.


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