问题描述
我正在使用 HTML 和 PDFKit 创建 PDF,如下所示:
let contextString = "<p style=\"page-break-after: always;\">hello</p><p>This is a test</p>"
let print = UIMarkupTextPrintFormatter(markupText: contextString)
let render = UIPrintPageRenderer()
render.addPrintFormatter(print,startingAtPageAt: 0)
let page = CGRect(x: 0,y: 0,width: 595.2,height: 841.8) // A4,72 dpi
render.setValue(page,forKey: "paperRect")
render.setValue(page,forKey: "printableRect")
let pdfData = NSMutableData()
UIGraphicsBeginPDFContextToData(pdfData,.zero,nil)
for i in 0..<render.numberOfPages {
UIGraphicsBeginpdfpage();
render.drawPage(at: i,in: UIGraphicsGetPDFContextBounds())
}
UIGraphicsEndPDFContext();
let av = UIActivityViewController(activityItems: [pdfData],applicationActivities: nil)
UIApplication.shared.windows.first?.rootViewController?.present(av,animated: true,completion: nil)
我在第一个 <p>
之后添加了一个分页符。这有点好用。它进行了两次分页,第二个 <p>
根本不显示。
解决方法
只需对您的 contextString 进行一次更改,我就能让您的代码正常工作。
通过将其更改为 page-break-before
而不是 page-break-after
似乎可以工作。这就是我将您的 contextString 更改为的内容,我使用了多行字符串,因为它更易于阅读并为其提供了更清晰的内容。
let contextString = """
<p>Content in page 1</p>
<p style=\"page-break-before: always;\"></p>
<p>Content in page 2</p>
"""
这是一个非常简单的示例,您可以将其放入 Xcode。
class ViewController: UIViewController {
let button = UIButton()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
view.addSubview(button)
button.translatesAutoresizingMaskIntoConstraints = false
button.setTitle("Print",for: .normal)
button.setTitleColor(.systemBlue,for: .normal)
button.addTarget(self,action: #selector(tapped),for: .touchUpInside)
NSLayoutConstraint.activate([
button.centerXAnchor.constraint(equalTo: view.centerXAnchor),button.centerYAnchor.constraint(equalTo: view.centerYAnchor),button.leadingAnchor.constraint(equalTo: view.leadingAnchor,constant: 20),])
view.backgroundColor = .systemBackground
}
@objc func tapped() {
let contextString = """
<p>Content in page 1</p>
<p style=\"page-break-before: always;\"></p>
<p>Content in page 2</p>
"""
let print = UIMarkupTextPrintFormatter(markupText: contextString)
let render = UIPrintPageRenderer()
render.addPrintFormatter(print,startingAtPageAt: 0)
let page = CGRect(x: 0,y: 0,width: 595.2,height: 841.8) // A4,72 dpi
render.setValue(page,forKey: "paperRect")
render.setValue(page,forKey: "printableRect")
let pdfData = NSMutableData()
UIGraphicsBeginPDFContextToData(pdfData,.zero,nil)
for i in 0..<render.numberOfPages {
UIGraphicsBeginPDFPage();
render.drawPage(at: i,in: UIGraphicsGetPDFContextBounds())
}
UIGraphicsEndPDFContext();
let av = UIActivityViewController(activityItems: [pdfData],applicationActivities: nil)
self.present(av,animated: true,completion: nil)
}
}
这是显示带有文本的两个页面的 gif: