swift:枚举值转Int

let dict = [NSParagraphStyleAttributeName:par,
                NSFontAttributeName:self.alertContentLabelFont(),
                NSUnderlineStyleAttributeName:NSNumber.init(integer: NSUnderlineStyle.StyleNone.rawValue)]

//Cannot convert value of type 'NSUnderlineStyle' to expected argument type 'Int' --->用rawValue 解决枚举转Int

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