NSAttributedString change color and font size

Hi, i have some problem with my app. I have very many Strings in Localizable.strings, they have attributes like <b><big><br> etc. so i read it like HTML, but than in my app it change my Label color and size, did anyone how to fix it?
I explain everything on StackOverflow
I'm new in Swift and I'm converting my Android application to iOS.
Thanks !