Core Text - NSAttributedString line height done right?

Question

I\'m completely in the dark with Core Text\'s line spacing. I\'m using NSAttributedString and I specify the following attributes on it: - kCTFontAttributeName - kCTParagraph

Answer 1

This worked for me in Xcode 7.2. iOS 9.2.1. (Swift 2.1.):

  dispatch_async(dispatch_get_main_queue()) { () -> Void in
        let paragraphStyleWithSpacing           = NSMutableParagraphStyle()
        paragraphStyleWithSpacing.lineSpacing   = 2.0 //CGFloat
        let textWithLineSpacing                 = NSAttributedString(string: str, attributes: [NSParagraphStyleAttributeName : paragraphStyleWithSpacing])
        self.MY_TEXT_VIEW_NAME.attributedText   = textWithLineSpacing
    }