苹果PDFKit错误的高亮注释 [英] Wrong highlight annotation on apple PDFKit

问题描述

我在iOS上使用PDFKit来突出显示文本（PDF文件）。我通过创建PDFAnnotation并将其添加到选定的文本区域来实现。我想要精确地突出显示所选区域，但它总是覆盖整个线条，如下图所示。如何仅为所选区域创建注释？

I'm using PDFKit on iOS to highlight texts (PDF file). I do it by create a PDFAnnotation and add it to the selected text area. I want to highlight precisely the selected area but it always covers the whole line like the pics below. How can I create the annotation for the selected area only??

我的代码：

        let highlight = PDFAnnotation(bounds: selectionText.bounds(for: page), forType: PDFAnnotationSubtype.highlight, withProperties: nil)
        highlight.color = highlightColor
        page.addAnnotation(highlight)

推荐答案

PDFSelection bounds（forPage :) 方法返回一个矩形以满足整个选择区域。在你的情况下不是最好的解决方案。

PDFSelection bounds(forPage:) method returns one rectangle to satisfy whole selection area. Is not the best solution in your case.

尝试使用 selectionsByLine（），并为每个rect添加单独的注释，表示PDF中的每个选定行。示例：

Try with selectionsByLine(), and add individual annotation for every rect, representing every single selected line in PDF. Example:

    let selections = pdfView.currentSelection?.selectionsByLine()
    // Simple scenario, assuming your pdf is single-page.
    guard let page = selections?.first?.pages.first else { return }

    selections?.forEach({ selection in
        let highlight = PDFAnnotation(bounds: selection.bounds(for: page), forType: .highlight, withProperties: nil)
        highlight.endLineStyle = .square
        highlight.color = UIColor.orange.withAlphaComponent(0.5)

        page.addAnnotation(highlight)
    })

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