put avatar on button

avatar.m

// setup code to draw / display avatar
    UIView *avatarView = [[UIView alloc] init];
    avatarView.frame = CGRectMake(20, 50, 280, 100);
    avatarView.layer.borderColor = [UIColor redColor].CGColor;
    avatarView.layer.borderWidth = 3.0f;
    [self.view addSubview:avatarView];
    
    // do additional loading for avatars
    UIButton *avatarButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    // the last two values control the size of the button
    avatarButton.frame = CGRectMake(0, 0, 80, 80);
    // make corners round
    avatarButton.layer.cornerRadius = 35; // value varies -- // 35 yields a pretty good circle.
    avatarButton.clipsToBounds = YES;
    
    
    // retrieve image from Core Data and place on UIButton
    NSFetchRequest *request = [[NSFetchRequest alloc] init];
    
    // define table / entity to use
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Account"inManagedObjectContext:_managedObjectContext];
    [request setEntity:entity];
    
    // fetch records and handle error
    NSError *error;
    NSMutableArray *mutableFetchResults = [[_managedObjectContext executeFetchRequest:request error:&error] mutableCopy];
    
    if (!mutableFetchResults) {
        // handle error
    }
    for (Account *anAccount in mutableFetchResults) {
        if ([anAccount.username isEqualToString:lblUSERNAME.text]) {
            NSLog(@"username found.");
        
            // fetch avatar / attribute based on username
            _avatar = [UIImage imageWithData:anAccount.avatar scale:1];
        }
    }
    if (_avatar == nil) {
        NSLog(@"couldn't find avatar");
    } else {
        [avatarButton setBackgroundImage:_avatar forState:UIControlStateNormal];
    }
    // add button to subview
    [avatarView addSubview:avatarButton];