UIProgressView not update in insertion sqlite loop

The exact context is :

• View 1 call web service to get array of data.


• Then View 1 call masterDb to insert that array of data. In every loop, the current index is passed back to View 1 for updating UIProgressView progress. But currently, I tried many different ways but no one worked.

These are the code:

View 1:

    - (void)onClientFinish:(NSString *)clientid status:(NSString *)status mesg:(NSString *)mesg action:(NSString *)action data:(NSObject *)data {

    NSArray *dataArray = (NSArray*)data;

        [self performSelectorInBackground:@selector(backgroundProcess:) withObject:dataArray];

    }

     (void) backgroundProcess:(NSArray *)dataArray {
    BOOL result = [m_dbMaster updateMasterData:dataArray];
    if(!result)
        [utilClass showMessage:[NSString stringWithFormat:@"Download Master data fail."]];
    else
        [utilClass showMessage:[NSString stringWithFormat:@"Download Master data successfully."]];

    [m_dbMaster closeDb];

    [self endDownload]; }

- (void) onConfirm:(NSArray *)entryList {
    int dataLength  = [[entryList objectAtIndex:0] intValue];
    int currentIndex= [[entryList objectAtIndex:1] intValue];
    float progress = (float)currentIndex  / (float)dataLength ;

    [self performSelectorOnMainThread:@selector(updateProgress:)
                               withObject:[NSNumber numberWithFloat:progress]
                            waitUntilDone:NO]; 
}

Master DB

- (BOOL) updateEmpArr:(NSArray*) dataArray {
//delete all and add later
sqlite3_exec(m_db, "BEGIN EXCLUSIVE TRANSACTION", 0, 0, 0);
.......
char *errMesg ;
NSString *insertSql  = @"INSERT INTO EMPLOYEE(EMP_ID, EMP_CODE, EMP_NAME, EMP_OUTLET, EMP_DEPT) VALUES ";
int index            = 0;

for (NSMutableDictionary *empData in dataArray) {
    NSArray *entrys = [[NSArray alloc] initWithObjects:[NSString stringWithFormat:@"%lu", (unsigned long)[dataArray count]],[NSString stringWithFormat: @"%d",index+1], nil];
    [self.delegate onConfirm:entrys];
   ......
    index ++;
}


return result ;

}

Please help me. Really appreciate for all helps.