Swift中的drawGlyphsForGlyphRange (显示不可见字符)。replaceGlyphAtIndex已弃用

func drawGlyphsForGlyphRange(glyphRange: NSRange, at origin: CGPoint) {
    guard let context = UIGraphicsGetCurrentContext() else { return }
    
    let font = UIFont.systemFont(ofSize: 12)
    let text = "Hello World"
    
    let attributedString = NSAttributedString(string: text, attributes: [NSAttributedString.Key.font: font])
    let layoutManager = NSLayoutManager()
    let textStorage = NSTextStorage(attributedString: attributedString)
    textStorage.addLayoutManager(layoutManager)
    
    let textContainer = NSTextContainer(size: CGSize(width: 200, height: 200))
    layoutManager.addTextContainer(textContainer)
    
    let glyphRange = layoutManager.glyphRange(forCharacterRange: NSRange(location: 0, length: text.count), actualCharacterRange: nil)
    
    let glyphRect = layoutManager.boundingRect(forGlyphRange: glyphRange, in: textContainer)
    
    let glyphPositions = layoutManager.glyphLocations(forGlyphRange: glyphRange)
    
    context.saveGState()
    context.translateBy(x: origin.x, y: origin.y)
    context.translateBy(x: 0, y: glyphRect.height)
    context.scaleBy(x: 1, y: -1)
    
    layoutManager.drawGlyphs(forGlyphRange: glyphRange, at: CGPoint.zero)
    
    context.restoreGState()
}