iOS端如何直接将图片分享至Instagram？

Hey there, I get what you're trying to do—skipping that extra "Copy to Instagram" step and jumping straight into the app to share your image. Let's break down why your current code is showing that menu, and how to fix it with two solid solutions:

Why Your Current Code Shows the Menu #

Right now, you're using presentOpenInMenu() with UIDocumentInteractionController, which triggers the system's default "Open In" picker. That's why you have to manually select "Copy to Instagram" every time. To skip this, we need to directly invoke Instagram's handling of your image, no picker required.

Solution 1: Use presentPreview() to Bypass the Menu #

Instead of showing the app picker, we can use presentPreview() to launch Instagram's built-in preview interface directly. This lets users review the image and hit post without extra steps.

Here's how to modify your code:

1. Replace the presentOpenInMenu() call with presentPreview():

// Remove this line:
// self.documentController.presentOpenInMenu(from: self.view.bounds, in: self.view, animated: true)

// Replace with:
if UIDevice.current.userInterfaceIdiom == .phone {
    self.documentController.presentPreview(from: self.view.bounds, in: self.view, animated: true)
}

2. Make sure your view controller implements the required delegate method for preview:

extension YourViewController: UIDocumentInteractionControllerDelegate {
    func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController {
        return self
    }
}

This method keeps your image in the temporary directory (no camera roll save needed) and skips the picker entirely.

Solution 2: Directly Launch Instagram's Post Interface (Requires Camera Roll Access) #

If you want to jump straight to Instagram's post screen (no preview), you can save the image to the camera roll first, then use Instagram's URL Scheme to open directly to that image.

Here's the code for this approach:

import Photos

// First, request camera roll permission
PHPhotoLibrary.requestAuthorization { status in
    guard status == .authorized else {
        // Handle permission denial here
        return
    }

    // Save your image data to the camera roll
    PHPhotoLibrary.shared().performChanges({
        PHAssetCreationRequest.forAsset().addResource(with: .photo, data: imageData!, options: nil)
    }) { success, error in
        guard success, error == nil else {
            // Handle save error here
            return
        }

        // Fetch the newly saved asset
        let fetchOptions = PHFetchOptions()
        fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
        let fetchResult = PHAsset.fetchAssets(with: .image, options: fetchOptions)
        
        if let latestAsset = fetchResult.firstObject {
            // Use Instagram's URL Scheme to open directly to the asset
            let instagramURL = URL(string: "instagram://library?AssetPath=\(latestAsset.localIdentifier)")!
            DispatchQueue.main.async {
                if UIApplication.shared.canOpenURL(instagramURL) {
                    UIApplication.shared.open(instagramURL, options: [:], completionHandler: nil)
                }
            }
        }
    }
}

Notes for This Solution:

• You'll need to add a privacy description to your Info.plist for camera roll access:

  <key>NSPhotoLibraryAddUsageDescription</key>
  <string>We need access to save images for sharing to Instagram</string>
  

• This saves the image to the user's camera roll (which some users might not prefer), but it's the most direct way to skip all intermediate screens.

Critical Setup Step #

Don't forget to add Instagram's URL Scheme to your Info.plist to allow your app to open it:

<key>LSApplicationQueriesSchemes</key>
<array>
    <string>instagram</string>
</array>

Pick the solution that fits your app's needs—Solution 1 is great if you want to avoid camera roll saves, while Solution 2 gives the most seamless direct post experience.

内容的提问来源于stack exchange，提问作者user11182249