Make part of a UILabel bold in Swift

Question

I have a UILabel I\'ve made programmatically as:

var label = UILabel()

I\'ve then declared some styling for the label, includi

Answer 1

Just sharing my own quite-flexible implementation in Swift 4.0. Cause there are some requirements, like mine currently, that you need to set not only bold but italic the part of a label's text.

import UIKit

extension UILabel {

    /** Sets up the label with two different kinds of attributes in its attributed text.
     *  @params:
     *  - primaryString: the normal attributed string.
     *  - secondaryString: the bold or highlighted string.
     */

    func setAttributedText(primaryString: String, textColor: UIColor, font: UIFont, secondaryString: String, secondaryTextColor: UIColor, secondaryFont: UIFont) {

        let completeString = "\(primaryString) \(secondaryString)"

        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.alignment = .center

        let completeAttributedString = NSMutableAttributedString(
            string: completeString, attributes: [
                .font: font,
                .foregroundColor: textColor,
                .paragraphStyle: paragraphStyle
            ]
        )

        let secondStringAttribute: [NSAttributedStringKey: Any] = [
            .font: secondaryFont,
            .foregroundColor: secondaryTextColor,
            .paragraphStyle: paragraphStyle
        ]

        let range = (completeString as NSString).range(of: secondaryString)

        completeAttributedString.addAttributes(secondStringAttribute, range: range)

        self.attributedText = completeAttributedString
    }
}