Selected state of text in a segmented control in Xcode

I am working on my first application using Swift and Xcode.

In one of my views, I have a segmented control which has emoticons as the text being displayed. However, I have a problem where whenever one of the emoticons is selected, it becomes blacked out as shown in the image below:

I think the problem has to do with the text attributes of the selected state of my segmented control, and my attempt at a fix was setting the text attributes of the selected state to be the same as the text attributes of the normal state:

override func viewDidAppear(animated: Bool) {
    moodSelector.setTitleTextAttributes(moodSelector.titleTextAttributesForState(.Normal), forState: .Selected)
}

However, this does not seem to work. Any help would be appreciated?

---

You can set NSAttributedStringKey.foregroundColor (formerly known as NSForegroundColorAttributeName ) to any color and it prevents that behavior. For example, in Swift 3 or 4:

override func viewDidLoad() {
    super.viewDidLoad()         // whether `viewDidLoad` or `viewDidAppear`, make sure to call the appropriate `super` method, too

    let attributes = [NSAttributedStringKey.foregroundColor : UIColor.white]
    moodSelector.setTitleTextAttributes(attributes, for: .selected)
}

Yielding:

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