不可编辑的UITextView为字体返回nil

Question

我有一个UITextView，它将selectable和editable设置为false：

var myMutableString = NSMutableAttributedString()
var myString:String = "hello kitty!"
myMutableString = NSMutableAttributedString(string: myString)

//some styling
myTextView.attributedText = myMutableString
println(myTextView.font) //returns nil