Swift UIWebView Pdf View UIActivityViewController Error

Question

>您好，我有一个简单的应用程序，我试图将 html 创建到 pdf 到 web 视图并看起来很成功，但我想添加与 UIActivityViewController 的按钮共享（进入打印、邮件等）

我的代码在这里。

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    createPDF();
    loadPDF("file.pdf");
    // ActivityViewController
    btn!.setTitle("Open Menu", forState: .Normal)
    btn!.addTarget(self, action: "pressBtn:", forControlEvents: .TouchUpInside)
    btn!.sizeToFit()
    btn!.center = view.center
    view.addSubview(btn!)
}

func createPDF() {
    let html = "<b>Hello <i>World!</i></b> <p>Generate PDF file from HTML in Swift</p>"
    let fmt = UIMarkupTextPrintFormatter(markupText: html)
    // 2. Assign print formatter to UIPrintPageRenderer
    let render = UIPrintPageRenderer()
    render.addPrintFormatter(fmt, startingAtPageAtIndex: 0)
    // 3. Assign paperRect and printableRect
    let page = CGRect(x: 0, y: 0, width: 595.2, height: 841.8) // A4, 72 dpi
    let printable = CGRectInset(page, 0, 0)
    render.setValue(NSValue(CGRect: page), forKey: "paperRect")
    render.setValue(NSValue(CGRect: printable), forKey: "printableRect")
    // 4. Create PDF context and draw
    let pdfData = NSMutableData()
    UIGraphicsBeginPDFContextToData(pdfData, CGRectZero, nil)
    for i in 1...render.numberOfPages() {
        UIGraphicsBeginPDFPage();
        let bounds = UIGraphicsGetPDFContextBounds()
        render.drawPageAtIndex(i - 1, inRect: bounds)
    }
    UIGraphicsEndPDFContext();
    // 5. Save PDF file
    let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
    pdfData.writeToFile("(documentsPath)/file.pdf", atomically: true)
}

func loadPDF(filename: String) {
    let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
    let filePath = "(documentsPath)/file.pdf"
    let url = NSURL(fileURLWithPath: filePath)
    let urlRequest = NSURLRequest(URL: url)
    webView!.loadRequest(urlRequest)
}

func pressBtn(sender:UIButton){

    let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
    let filePath = "(documentsPath)/file.pdf"
    let activityItems = [filePath]
    let activityViewController = UIActivityViewController(activityItems: activityItems, applicationActivities: nil)
    presentViewController(activityViewController, animated: true, completion: nil)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

当单击按钮出现此错误时

 *** Terminating app due to uncaught exception 'NSGenericException', reason: 'UIPopoverPresentationController (<_UIAlertControllerActionSheetRegularPresentationController: 0x79b601b0>) should have a non-nil sourceView or barButtonItem set before the presentation occurs.'
*** First throw call stack:

感谢您的帮助。

Answer 1

您是否尝试过在调用 presentViewController 之前指定源视图？

let activityViewController = UIActivityViewController(activityItems: activityItems, applicationActivities: nil)
activityViewController.popoverPresentationController?.sourceView = sender
presentViewController(activityViewController, animated: true, completion: nil)

Answer 2

错误可能是其他原因，

无论如何，您都希望使用UIDocumentInteractionController而不是UIActivityController

。

将 uti 设置为 "com.adobe.pdf"