let aa = UIFont.familyNames()
for family in aa {
NSLog("\(family)")
let bb = UIFont.fontNamesForFamilyName(family as! String)
for f in bb {
NSLog("\t\(f)")
}
罗列系统中的所有字体
原文：http://www.cnblogs.com/motoyang/p/4856195.html
