UIKit: SF Pro Rounded 如何实现？

Question

Help pls, I searched around and can't find the solution to implement this; Rounded , The rounded variant of the default typeface.

Here's the sample code

//: A UIKit based Playground for presenting user interface

import UIKit
import PlaygroundSupport

class MyViewController : UIViewController {
    override func loadView() {
        let view = UIView()
        view.backgroundColor = .white

        let label = UILabel()
        label.frame = CGRect(x: 150, y: 200, width: 200, height: 32)
        label.text = "Hello World!"
        label.textColor = .black
        label.font = .systemFont(ofSize: 32, weight: .semibold)
        label.font.fontDescriptor.withDesign(.rounded) // I'm guessing this is wrong

        view.addSubview(label)
        self.view = view
    }
}
// Present the view controller in the Live View window
PlaygroundPage.current.liveView = MyViewController()

Thanks

Answer 1

Well with the code from original answer ( How to use SF Rounded font in SwiftUI? ), you can use it in your code like this:

    override func loadView() {
    let view = UIView()
    view.backgroundColor = .white

    let label = UILabel()
    label.frame = CGRect(x: 150, y: 200, width: 200, height: 32)
    label.text = "Hello World!"
    label.textColor = .black

    // set rounded font
    let fontSize: CGFloat = 32
    let systemFont = UIFont.systemFont(ofSize: fontSize, weight: .semibold)
    let roundedFont: UIFont
    if let descriptor = systemFont.fontDescriptor.withDesign(.rounded) {
        roundedFont = UIFont(descriptor: descriptor, size: fontSize)
    } else {
        roundedFont = systemFont
    }

    label.font = roundedFont

    view.addSubview(label)
    self.view = view
}

But when you want to use it on multiple places, it would be better if you could reuse it... so for example I create class called FontKit... which has static function, which gives me rounded font. Like this:

class FontKit {

 static func roundedFont(ofSize fontSize: CGFloat, weight: UIFont.Weight) -> UIFont {
    let systemFont = UIFont.systemFont(ofSize: fontSize, weight: weight)
    let font: UIFont

    if #available(iOS 13.0, *) {
        if let descriptor = systemFont.fontDescriptor.withDesign(.rounded) {
            font = UIFont(descriptor: descriptor, size: fontSize)
        } else {
            font = systemFont
        }
    } else {
        font = systemFont
    }

    return font
}
}

And then in my code I use it like this:

label.font = FontKit.roundedFont(ofSize: 32, weight: .semibold)

Answer 2

If you know you'll only be using this for the system font, you can simplify it into the following:

public extension UIFont {
    
    var rounded: UIFont {
        guard let desc = self.fontDescriptor.withDesign(.rounded)
        else { return self }
        return UIFont(descriptor: desc, size: self.pointSize)
    }
    
}

and then call it like:

let sysFont: UIFont = .systemFont(ofSize: UIFont.systemFontSize)
label.font = sysFont.rounded

Calling it on any other font will just return the same font.