如何在iOS PDFKit中取消选择文本框小部件

import PDFKit

func deselectTextFieldsInPDF() {
    guard let pdfURL = Bundle.main.url(forResource: "example", withExtension: "pdf") else {
        return
    }
    
    if let pdfDocument = PDFDocument(url: pdfURL) {
        for pageIndex in 0..<pdfDocument.pageCount {
            if let page = pdfDocument.page(at: pageIndex) {
                for annotation in page.annotations {
                    if annotation.type == .widget {
                        if let textField = annotation.widgetControlView as? PDFTextField {
                            textField.isSelected = false
                        }
                    }
                }
            }
        }
    }
}