如何实现pdf编辑器 [英] how to implement pdf editor

问题描述

我正在开发一个应用程序，正在使用pdfkit，它应该能够读取和编辑pdf文件.我发现iOS的编辑器本身就像下面的图片一样

I am working on an application and I am using pdfkit which I should have the ability to read pdf files and edit them. I found that iOS has an editor like the image below it self

有什么方法可以在我的应用程序中实现类似的功能?我应该搜索什么?

is there any way to implement something like this one in my application? what should I searched for?

感谢任何帮助.谢谢

推荐答案

func createAndEditPDF() {

        let pdfURL = NSURL(fileURLWithPath: self.selectedFile.fileURL); // URL of the existing PDF 
        if let pdf:CGPDFDocument = CGPDFDocument(pdfURL as CFURL) { // Create a PDF Document
            let _newURL = "\(documentFolderPath)/\(self.selectedFile.name)"; // New URL to save editable PDF
            let _url = NSURL(fileURLWithPath: _newURL)
            var _mediaBox:CGRect = CGRect(x: 0, y: 0, width: pageWidth, height: pageHeight); // mediabox which will set the height and width of page
            let _writeContext = CGContext(_url, mediaBox: &_mediaBox, nil) // get the context

            //Run a loop to the number of pages you want
            for i in 0..<self.pages.count
            {
                if let _page = pdf.page(at: self.pages[i]) { // get the page number
                    var _pageRect:CGRect = page.getBoxRect(CGPDFBox.mediaBox) // get the page rect 
                    _writeContext!.beginPage(mediaBox: &_pageRect); // begin new page with given page rect
                    _writeContext!.drawPDFPage(_page); // draw content in page
                    _writeContext!.endPage(); // end the current page
                }
            } 
        }
    }

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