I'm, trying to configure segmented control bar.

The goal is to make text font of each segment in different colour. So it should look like this:

A couple of final notes:

• This solution could impact other tint properties you may want to set and is useful when you want to keep the same color of the text for selected and deselected states
• Future iOS updates and implementations of Segment Control could have an impact on how this works

Update

If you want to specify the title color for a specific segment, you could assume (gamble) that the segment control should lay out its subviews in the logical order.

I emphasized on assume because this order is not in our control and you are at the mercy of the implementation.

Infact, if you set the selected index segmentedControl.selectedSegmentIndex = 1 and if you have 4 segments, the order of laying out the subviews is 0, 2, 3, 1 so the selected segment gets added last.

What could work for your situation is as follows:

// Add a color queue to hold the colors for the 4 segments
var colorQueue: [UIColor] = [.red, .blue, .green, .orange]

private func updateSegmentTextColor(_ rootView: UIView)
{
    for subview in rootView.subviews
    {
        if let label = subview as? UILabel,
           !colorQueue.isEmpty
        {
            // Dequeue the front of the queue
            let color = colorQueue.removeFirst()
            label.textColor = color
        }
        
        updateSegmentTextColor(subview)
    }
}

private func addControl()  {
    let items = ["One", "Two", "Three", "Four"]
    let segmentedControl = UISegmentedControl(items: items)
    segmentedControl.frame = CGRect(x: 35, y: 200, width: 250, height: 50)
    segmentedControl.center = view.center
    segmentedControl.tintColor = .blue
    view.addSubview(segmentedControl)
    
    // custom function
    updateSegmentTextColor(segmentedControl)
    
    // Add the selected index if you need AFTER the updates
    segmentedControl.selectedSegmentIndex = 1
}

You get this