Background color change is late, so it flashes from white to selected color

[mladjan]

I have a graph which is part of my UIView subclass (looks like this):

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        [self setupUI];
    }
    return self;
}

- (void)awakeFromNib {
    [super awakeFromNib];
    [self setupUI];
}

- (void)setupUI {
    // Create AAChartView instance
    _aaChartView = [[AAChartView alloc] init];
    _aaChartView.scrollEnabled = NO;
    _aaChartView.translatesAutoresizingMaskIntoConstraints = NO;
    [self addSubview:_aaChartView];
    
    // Add constraints to position and size _aaChartView within RBGraphView
    NSLayoutConstraint *topConstraint = [_aaChartView.topAnchor constraintEqualToAnchor:self.topAnchor];
    NSLayoutConstraint *bottomConstraint = [_aaChartView.bottomAnchor constraintEqualToAnchor:self.bottomAnchor];
    NSLayoutConstraint *leadingConstraint = [_aaChartView.leadingAnchor constraintEqualToAnchor:self.leadingAnchor];
    NSLayoutConstraint *trailingConstraint = [_aaChartView.trailingAnchor constraintEqualToAnchor:self.trailingAnchor];
    
    [NSLayoutConstraint activateConstraints:@[topConstraint, bottomConstraint, leadingConstraint, trailingConstraint]];
    
    
    AAChart *aaChart = AAChart.new
    .backgroundColorSet(@"#191923");
    
    AATitle *aaTitle = AATitle.new
    .textSet(@"");

    AAOptions *aaaOptions = AAOptions.new
    .chartSet(aaChart)
    .titleSet(aaTitle) ;

    
    [_aaChartView aa_drawChartWithOptions:aaaOptions];

}

It is added to ViewController in viewDidLoad:

 public override func viewDidLoad() {
        super.viewDidLoad()
        
        rbGraphView = RBGraphView()
        guard let rbGraphView = rbGraphView else {return}
        rbGraphView.translatesAutoresizingMaskIntoConstraints = false
        graphContentView.addSubview(rbGraphView)

// some auto layout constraints

}

The problem is that background color change is happening when the screen is shown, so it flashes from white to #191923

I can't add and draw it earlier then viewDidLoad.

Is there any way to make it earlier?