我试图将属性添加到文本标签：
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = NSTextAlignment.Center
let para = NSMutableAttributedString()
let font:UIFont? = UIFont(name: "DIN Alternate",size: 18.0)
let font2:UIFont? = UIFont(name: "Arial",size: 12.0)
let labelColor = UIColor.whiteColor()
let text="some text"
//A,error appears here
let myAttributes = [NSParagraphStyleAttributeName:paragraphStyle,NSFontAttributeName:font,NSForegroundColorAttributeName:labelColor]
let attrString = NSAttributedString(
string: csvObject.provideDetailsAsString(poi)!,attributes: myAttributes)
para.appendAttributedString(attrString)
detailsText.attributedText = para
但是在//行A中的Swift编译器错误并说：
'_' is not convertible to 'String'
我正在使用XCode 6.4和Swift 1.2
解决方法
找到它,加一个！字体后：NSFontAttributeName：font！
font是可选的