How do I apply UIAppearance Proxy properties to UILabel?

Question

I have been getting unreliable results while trying to apply UIAppearance proxy styles to the UILabel class proxy. For example, the following works as I would expect:

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Answer 1

Following code worked for me using swift 2.2 and for iOS 9.0

    let textFieldInsideSearchBar = self.searchBar?.valueForKey("searchField") as? UITextField
    textFieldInsideSearchBar?.textColor = BCGConstants.Colors.darkBluishPurpleColor()

    let textFieldInsideSearchBarLabel = textFieldInsideSearchBar!.valueForKey("placeholderLabel") as? UILabel
    textFieldInsideSearchBarLabel?.textColor = UIColor(red: 220/255, green: 209/255, blue: 231/255, alpha: 1.0)`enter code here`