Swift/Xcode开发：分享PDF时分享按钮无可选应用求助

Hey Jacob, let's figure out why your share sheet is only showing that empty "[...] more" option instead of the apps you expect. From the code snippet you shared, there are a few common pitfalls that could be causing this—let's walk through fixing them step by step.

First, Fix the PDF Path Retrieval #

The first red flag I see is your ofType parameter: you're passing ".pdf" (with a leading dot), but Bundle.main.path(forResource:ofType:) expects the file extension without the dot. That might be causing your path variable to be nil, and when you force-unwrap it with path!, you're either crashing silently or passing an invalid URL to the share sheet.

Update that line to:

let path = Bundle.main.path(forResource: "Brewolution A Bunnys Tale - Påske 2012", ofType: "pdf")

Ensure Your PDF is Actually in the Bundle #

Double-check that your PDF file is properly added to your project:

• Go to your target's Build Phases > Copy Bundle Resources
• Make sure "Brewolution A Bunnys Tale - Påske 2012.pdf" is listed here. If not, add it by clicking the "+" button and selecting the file.

Fix the Share Sheet Implementation #

Assuming you have a share button connected to an action, here's a robust way to present the share sheet with your PDF:

First, add the MobileCoreServices import at the top of your file (we'll need it for PDF type identifiers):

import UIKit
import WebKit
import MobileCoreServices

Then implement your share action:

@IBAction func sharePDFButtonTapped(_ sender: UIButton) {
    // Safely retrieve the PDF file URL
    guard let pdfFileName = "Brewolution A Bunnys Tale - Påske 2012",
          let fileURL = Bundle.main.url(forResource: pdfFileName, withExtension: "pdf") else {
        print("Error: Could not locate PDF file in bundle")
        return
    }
    
    // Option 1: Share the file URL directly (simplest for most cases)
    let activityItems: [Any] = [fileURL]
    
    // Option 2: If Option 1 doesn't work, use an NSItemProvider for better type recognition
    // let pdfData = try? Data(contentsOf: fileURL)
    // let itemProvider = NSItemProvider(item: pdfData as NSData, typeIdentifier: kUTTypePDF as String)
    // let activityItems: [Any] = [itemProvider]
    
    // Create and present the activity view controller
    let activityVC = UIActivityViewController(activityItems: activityItems, applicationActivities: nil)
    
    // Critical for iPad: Set the popover source so the sheet displays correctly
    if let popoverController = activityVC.popoverPresentationController {
        popoverController.sourceView = sender
        popoverController.sourceRect = sender.bounds
    }
    
    present(activityVC, animated: true)
}

Why This Works #

• Using Bundle.main.url(forResource:withExtension:) is safer than path because it returns a URL directly, avoiding string-to-URL conversion issues.
• Sharing the file URL (or a properly typed NSItemProvider) tells the system exactly what kind of content you're sharing, so it can show all relevant apps (Mail, Messages, Files, etc.).
• The popover configuration ensures the share sheet behaves correctly on iPad (a common oversight that can cause unexpected display issues).

Quick Additional Checks #

• If you're still seeing no apps, test with a different PDF file (with a simpler name, no spaces or special characters) to rule out filename encoding issues.
• Make sure you're not accidentally sharing the WKWebView's request URL instead of the actual PDF file URL—sometimes web views modify URLs internally, which can break sharing.

Give these changes a try, and your share sheet should start showing all the appropriate apps again!

内容的提问来源于stack exchange，提问作者Jacob Smede