如何在swift中显示CGPDFDocument？ [英] How to display CGPDFDocument in swift?

问题描述

您好我有一个CGPDFDocument对象。我想通过在我的应用程序中显示它或使用外部应用程序来打开此文档。这是我到目前为止的代码。在SWIFT中

Hi I have a CGPDFDocument object. I want to open this document by either showing it in my app or using an external application. Here is the code I have so far. in SWIFT

 let cfData = CFDataCreate(kCFAllocatorDefault, UnsafePointer<UInt8>(data.File.bytes), data.File.length)
 let cgDataProvider =  CGDataProviderCreateWithCFData(cfData)
 let cgPDFDocument  =  CGPDFDocumentCreateWithProvider(cgDataProvider)

推荐答案

在objective-c的此答案的帮助下，这是一个有效的工作swift中的示例：

with help from this answer in objective-c, here is a working example in swift:

override func draw(_ rect: CGRect) {

    super.draw(rect)

    let context: CGContext = UIGraphicsGetCurrentContext()!
    context.setFillColor(red: 1.0,green: 1.0,blue: 1.0,alpha: 1.0)
    context.fill(self.bounds)
    let filepath = (Bundle.main.path(forResource: "Example", ofType: "pdf"))! as String
    let url = URL(fileURLWithPath: filepath)
    let pdf: CGPDFDocument! = CGPDFDocument(url as CFURL)
    let page: CGPDFPage = pdf.page(at: 1)!
    let pageRect: CGRect = page.getBoxRect(CGPDFBox.mediaBox)
    let scale: CGFloat = min(self.bounds.size.width / pageRect.size.width , self.bounds.size.height / pageRect.size.height)
    context.saveGState()
    context.translateBy(x: 0.0, y: self.bounds.size.height)
    context.scaleBy(x: 1.0, y: -1.0)
    context.scaleBy(x: scale, y: scale)
    context.drawPDFPage(page)
    context.restoreGState()
}

以上代码是您将要显示的视图的 drawRect 方法pdf in。只需在viewController viewDidLoad 方法中将此视图添加为子视图，即可完成。

The above code is the drawRect method for the view you will be displaying the pdf in. Just add this view as subview in your viewController viewDidLoad method and you are done.

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