- (void)thread_function
{
    for (; ;) {
        textView.text = @"hello";
    }
}

-(void)StartRecvThread
{
    [NSThread detachNewThreadSelector:@selector(thread_function)
        toTarget:self withObject:nil];
}

- (void)thread_function
{
    for (; ;) {
        [textView performSelectorOnMainThread:@selector(setText:)
            withObject:@"hello" waitUntilDone:YES];
    }
}

timer = [NSTimer scheduledTimerWithTimeInterval:1.0
    target:self selector:@selector(processUpdate:) userInfo:nilrepeats:YES];

-(void)processUpdate:(NSTimer *)theTimer
{
    textfield1.text =
        [NSString stringWithFormat:@"Thread count: %d ", count];
}