在PDFKit中为文本批注配置键盘(iOS14)

let pdfView = PDFView(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height))
view.addSubview(pdfView)

if let pdfURL = Bundle.main.url(forResource: "example", withExtension: "pdf") {
    if let pdfDocument = PDFDocument(url: pdfURL) {
        pdfView.document = pdfDocument
    }
}

if let page = pdfDocument.page(at: 0) {
    let annotation = PDFAnnotationTextWidget(bounds: CGRect(x: 100, y: 100, width: 200, height: 50), forType: .freeText, withProperties: nil)
    annotation.font = UIFont.systemFont(ofSize: 16)
    annotation.widgetStringValue = "This is a text annotation"
    page.addAnnotation(annotation)
}

if let annotation = page.annotation(at: 0) as? PDFAnnotationTextWidget {
    annotation.isMultiline = true
    annotation.widgetStringValue = "This is a multiline text annotation"
    annotation.font = UIFont.systemFont(ofSize: 16)
    annotation.backgroundColor = UIColor.yellow
    annotation.keyboardAppearance = .dark
    annotation.keyboardType = .default
    annotation.isEditable = true
}