SwiftUI and Attributed Text

[rufy]

One key of attributedText is this

NSAttributedString.Key.verticalGlyphForm

this let you to write text in vertically way. example, Japanese or Chinese text.

this key unfortunately is only for UIKit.
So, Is there a way to print some text in swiftUI obtaining the same result?

Thank you

[jwbr]

@rufy

Even though it’s ‘not available’ for iOS, it still works. The following worked for me:

import SwiftUI

struct VerticalText: UIViewRepresentable {
var string: String
var highlight: String
var fontSize: CGFloat

func makeUIView(context: Context) -> UILabel {
    let v = UILabel()
    return v
}

func updateUIView(_ uiView: UILabel, context: Context) {
    let selected: [NSAttributedString.Key : Any] =
        [ NSAttributedString.Key.verticalGlyphForm: true,
          NSAttributedString.Key.foregroundColor: UIColor(.secondary) ]

    let notSelected: [NSAttributedString.Key : Any] =
        [ NSAttributedString.Key.verticalGlyphForm: true,
          NSAttributedString.Key.foregroundColor: UIColor(.secondary) ]
    
    let highlighted: [NSAttributedString.Key : Any] =
        [ NSAttributedString.Key.verticalGlyphForm: true,
          NSAttributedString.Key.foregroundColor: UIColor(Color("AccentColor")) ]
    
    var mas: NSMutableAttributedString
    
    if let range = string.range(of: highlight, options: [.diacriticInsensitive]) {
        let a = string[..<range.lowerBound]
        let b = string[(range)]
        let c = string[range.upperBound...]
        
        let ma = NSMutableAttributedString(
            string: String(a),
            attributes: selected
        )
        let mb = NSMutableAttributedString(
            string: String(b),
            attributes: highlighted
        )
        let mc = NSMutableAttributedString(
            string: String(c),
            attributes: selected
        )
        
        mas = ma
        mas.append(mb)
        mas.append(mc)
        
    } else {
        mas = NSMutableAttributedString(
            string: string,
            attributes: notSelected
        )
    }
    
    uiView.attributedText = mas
    uiView.numberOfLines = 0
    uiView.preferredMaxLayoutWidth = fontSize
    uiView.font = UIFont(name: "UDDigiKyokashoNP-B", size: fontSize)
    uiView.setContentHuggingPriority(.defaultHigh, for: .vertical)
    uiView.setContentHuggingPriority(.defaultHigh, for: .horizontal)
    
}

}