在共享扩展和iOS应用程序之间共享文件路径/文件的代码

Question

我已为我的应用程序添加了一个分享扩展，称为 SAMPLESHARE（已存在于应用商店中）。每当用户拍照并尝试分享时，我希望他们通过一个“打开”功能的视图控制器而不是从苹果获得发布对话框，基本上是绕过它。因此，我正在尝试通过创建一个在应用和插件之间共享的应用程序组，在我的应用程序的应用程序委托的openURL中传递文件路径，来在分享扩展和我的应用程序之间共享图片。

因此，在我的主应用程序委托中：

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{

    return [[SAMPLEExternalFileHandler shared] handleExternalFileURL:url];
}

我是一名可以帮助翻译文本的助手。以下是需要翻译的内容：

基本上，我使用它来检查是否有URL文件路径需要打开不同的流程。

在我的SHAREEXTENSION中，我有

#import "ShareViewController.h"
#import <MobileCoreServices/UTCoreTypes.h>
//Macro to hide post dialog or not, if defined, will be hidden, comment during debugging
#define HIDE_POST_DIALOG

@interface ShareViewController ()

@end

@implementation ShareViewController

NSUInteger m_inputItemCount = 0; // Keeps track of the number of attachments we have opened asynchronously.
NSString * m_invokeArgs = NULL;  // A string to be passed to your AIR app with information about the attachments.
NSString * APP_SHARE_GROUP = @"group.com.SAMPLE.SAMPLESHAREPLUGIN";
const NSString * APP_SHARE_URL_SCHEME = @"SAMPLE";
CGFloat m_oldAlpha = 1.0; // Keeps the original transparency of the Post dialog for when we want to hide it.

- (BOOL)isContentValid {
    // Do validation of contentText and/or NSExtensionContext attachments here
    return YES;
}

- ( void ) didSelectPost
{
#ifdef HIDE_POST_DIALOG
    return;
#endif
    [ self passSelectedItemsToApp ];
    // Note: This call is expected to be made here. Ignore it. We'll tell the host we are done after we've invoked the app.
    //    [ self.extensionContext completeRequestReturningItems: @[] completionHandler: nil ];
}
- ( void ) addImagePathToArgumentList: ( NSString * ) imagePath
{
    assert( NULL != imagePath );

    // The list of arguments we will pass to the AIR app when we invoke it.
    // It will be a comma-separated list of file paths: /path/to/image1.jpg,/path/to/image2.jpg
    if ( NULL == m_invokeArgs )
    {
        m_invokeArgs = imagePath;
    }
    else
    {
        m_invokeArgs = [ NSString stringWithFormat: @"%@,%@", m_invokeArgs, imagePath ];
    }
}

- ( NSString * ) saveImageToAppGroupFolder: ( UIImage * ) image
                                imageIndex: ( int ) imageIndex
{
    assert( NULL != image );

    NSData * jpegData = UIImageJPEGRepresentation( image, 1.0 );

    NSURL * containerURL = [ [ NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier: APP_SHARE_GROUP ];
    NSString * documentsPath = containerURL.path;

    // Note that we aren't using massively unique names for the files in this example:
    NSString * fileName = [ NSString stringWithFormat: @"image%d.jpg", imageIndex ];

    NSString * filePath = [ documentsPath stringByAppendingPathComponent: fileName ];
    [ jpegData writeToFile: filePath atomically: YES ];

    return filePath;
}

- ( void ) passSelectedItemsToApp
{
    NSExtensionItem * item = self.extensionContext.inputItems.firstObject;

    // Reset the counter and the argument list for invoking the app:
    m_invokeArgs = NULL;
    m_inputItemCount = item.attachments.count;

    // Iterate through the attached files
    for ( NSItemProvider * itemProvider in item.attachments )
    {
        // Check if we are sharing a JPEG
        if ( [ itemProvider hasItemConformingToTypeIdentifier: ( NSString * ) kUTTypeImage ] )
        {
            // Load it, so we can get the path to it
            [ itemProvider loadItemForTypeIdentifier: ( NSString * ) kUTTypeImage
                                             options: NULL
                                   completionHandler: ^ ( UIImage * image, NSError * error )
             {
                 static int itemIdx = 0;

                 if ( NULL != error )
                 {
                     NSLog( @"There was an error retrieving the attachments: %@", error );
                     return;
                 }

                 // The app won't be able to access the images by path directly in the Camera Roll folder,
                 // so we temporary copy them to a folder which both the extension and the app can access:
                 NSString * filePath = [ self saveImageToAppGroupFolder: image imageIndex: itemIdx ];

                 // Now add the path to the list of arguments we'll pass to the app:
                 [ self addImagePathToArgumentList: filePath ];

                 // If we have reached the last attachment, it's time to hand control to the app:
                 if ( ++itemIdx >= m_inputItemCount )
                 {
                     [ self invokeApp: m_invokeArgs ];
                 }
             } ];
        }
    }
}
- ( void ) invokeApp: ( NSString * ) invokeArgs
{
    // Prepare the URL request
    // this will use the custom url scheme of your app
    // and the paths to the photos you want to share:
    NSString * urlString = [ NSString stringWithFormat: @"%@://%@", APP_SHARE_URL_SCHEME, ( NULL == invokeArgs ? @"" : invokeArgs ) ];
    NSURL * url = [ NSURL URLWithString: urlString ];

    NSString *className = @"UIApplication";
    if ( NSClassFromString( className ) )
    {
        id object = [ NSClassFromString( className ) performSelector: @selector( sharedApplication ) ];
        [ object performSelector: @selector( openURL: ) withObject: url ];
    }

    // Now let the host app know we are done, so that it unblocks its UI:
    [ super didSelectPost ];
}

#ifdef HIDE_POST_DIALOG
- ( NSArray * ) configurationItems
{
    // Comment out this whole function if you want the Post dialog to show.
    [ self passSelectedItemsToApp ];

    // To add configuration options via table cells at the bottom of the sheet, return an array of SLComposeSheetConfigurationItem here.
    return @[];
}
#endif


#ifdef HIDE_POST_DIALOG
- ( void ) willMoveToParentViewController: ( UIViewController * ) parent
{
    // This is called at the point where the Post dialog is about to be shown.
    // Make it transparent, so we don't see it, but first remember how transparent it was originally:

    m_oldAlpha = [ self.view alpha ];
    [ self.view setAlpha: 0.0 ];
}
#endif

#ifdef HIDE_POST_DIALOG
- ( void ) didMoveToParentViewController: ( UIViewController * ) parent
{
    // Restore the original transparency:
    [ self.view setAlpha: m_oldAlpha ];
}
#endif
#ifdef HIDE_POST_DIALOG
- ( id ) init
{
    if ( self = [ super init ] )
    {
        // Subscribe to the notification which will tell us when the keyboard is about to pop up:
        [ [ NSNotificationCenter defaultCenter ] addObserver: self selector: @selector( keyboardWillShow: ) name: UIKeyboardWillShowNotification    object: nil ];
    }

    return self;
}
#endif
#ifdef HIDE_POST_DIALOG
- ( void ) keyboardWillShow: ( NSNotification * ) note
{
    // Dismiss the keyboard before it has had a chance to show up:
    [ self.view endEditing: true ];
}
#endif
@end

我的扩展程序的info.plist文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>CFBundleDevelopmentRegion</key>
    <string>en</string>
    <key>CFBundleDisplayName</key>
    <string>SAMPLESHARE</string>
    <key>CFBundleExecutable</key>
    <string>$(EXECUTABLE_NAME)</string>
    <key>CFBundleIdentifier</key>
    <string>com.org.SAMPLE.$(PRODUCT_NAME:rfc1034identifier)</string>
    <key>CFBundleInfoDictionaryVersion</key>
    <string>6.0</string>
    <key>CFBundleName</key>
    <string>$(PRODUCT_NAME)</string>
    <key>CFBundlePackageType</key>
    <string>XPC!</string>
    <key>CFBundleShortVersionString</key>
    <string>1.0</string>
    <key>CFBundleSignature</key>
    <string>????</string>
    <key>CFBundleVersion</key>
    <string>1</string>
    <key>NSExtension</key>
    <dict>
        <key>NSExtensionAttributes</key>
         <dict>
        <key>NSExtensionActivationRule</key>
        <dict>
            <key>NSExtensionActivationSupportsImageWithMaxCount</key>
            <integer>1</integer>
        </dict>
    </dict>
        <key>NSExtensionMainStoryboard</key>
        <string>MainInterface</string>
        <key>NSExtensionPointIdentifier</key>
        <string>com.apple.share-services</string>
    </dict>
</dict>
</plist>

我基本上使用了一些来自互联网（声誉良好的网站）的通用许可证代码，声称已经通过应用商店审核过程。

代码中有两个解决方法，一个是从共享扩展中调用OpenURL（在iOS 8.3及以上版本中似乎仍然不可能正常进行，除非采用解决方法），另一个是隐藏苹果默认提供的发布对话框和键盘，当任何人点击分享时。

这个方法有效。

我有两个问题

1.) Will this be accepted on the app store? -- basically how are apps like facebook/whatsapp doing it and they are being accepted?
2.) Whenever I run this, it says `NSExtensionActivationRule` if set to `TRUEPREDICATE` will be rejected in review, what should the value be? 

更新:

浏览文档后，我找到了一个解决方案来修复第二个问题，并对其进行更改。现在一切都正常，没有使用TRUEPREDICATE，是否可以在商店中接受此内容?还是有其他的方法来实现这个呢?

更新2:

我现在使用NSUserDefaults将数据从扩展程序传递到应用程序，猜想这也是共享数据的要求之一。

- Vrashabh Irde

---

我稍后会更新。是的，它在审核中被接受了。 - Vrashabh Irde

感谢这篇有用的文章，我花了几个小时搜索关于这个主题的信息。 - Rocket Garden

@VrashabhIrde 我也在尝试着做类似的事情，但是由于内存限制，我无法将视频保存到共享存储。你有什么好的建议吗？ - Missa

Answer 1

更新

应用程序使用 NSUSERDEFAULTS 作为消息传递机制通过审核。以下是步骤。

1.) 分享扩展：

#import "ShareViewController.h"
#import <MobileCoreServices/UTCoreTypes.h>
//Macro to hide post dialog or not, if defined, will be hidden, comment during debugging
#define HIDE_POST_DIALOG

@interface ShareViewController ()

@end

@implementation ShareViewController

NSUInteger m_inputItemCount = 0; // Keeps track of the number of attachments we have opened asynchronously.
NSString * m_invokeArgs = NULL;  // A string to be passed to your AIR app with information about the attachments.
NSString * APP_SHARE_GROUP = @"group.com.schemename.nameofyourshareappgroup";
const NSString * APP_SHARE_URL_SCHEME = @"schemename";
CGFloat m_oldAlpha = 1.0; // Keeps the original transparency of the Post dialog for when we want to hide it.

- (BOOL)isContentValid {
    // Do validation of contentText and/or NSExtensionContext attachments here
    return YES;
}

- ( void ) didSelectPost
{
#ifdef HIDE_POST_DIALOG
    return;
#endif

    [ self passSelectedItemsToApp ];
    // Note: This call is expected to be made here. Ignore it. We'll tell the host we are done after we've invoked the app.
    //    [ self.extensionContext completeRequestReturningItems: @[] completionHandler: nil ];
}
- ( void ) addImagePathToArgumentList: ( NSString * ) imagePath
{
    assert( NULL != imagePath );

    // The list of arguments we will pass to the AIR app when we invoke it.
    // It will be a comma-separated list of file paths: /path/to/image1.jpg,/path/to/image2.jpg
    if ( NULL == m_invokeArgs )
    {
        m_invokeArgs = imagePath;
    }
    else
    {
        m_invokeArgs = [ NSString stringWithFormat: @"%@,%@", m_invokeArgs, imagePath ];
    }
}

- ( NSString * ) saveImageToAppGroupFolder: ( UIImage * ) image
                                imageIndex: ( int ) imageIndex
{
    assert( NULL != image );

    NSData * jpegData = UIImageJPEGRepresentation( image, 1.0 );

    NSURL * containerURL = [ [ NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier: APP_SHARE_GROUP ];
    NSString * documentsPath = containerURL.path;

    // Note that we aren't using massively unique names for the files in this example:
    NSString * fileName = [ NSString stringWithFormat: @"image%d.jpg", imageIndex ];

    NSString * filePath = [ documentsPath stringByAppendingPathComponent: fileName ];
    [ jpegData writeToFile: filePath atomically: YES ];

    //Mahantesh -- Store image url to NSUserDefaults

    NSUserDefaults *defaults=[[NSUserDefaults alloc] initWithSuiteName:@"group.com.schemename.nameofyourshareappgroup"];
    [defaults setObject:filePath forKey:@"url"];
    [defaults synchronize];

    return filePath;
}

- ( void ) passSelectedItemsToApp
{
    NSExtensionItem * item = self.extensionContext.inputItems.firstObject;

    // Reset the counter and the argument list for invoking the app:
    m_invokeArgs = NULL;
    m_inputItemCount = item.attachments.count;

    // Iterate through the attached files
    for ( NSItemProvider * itemProvider in item.attachments )
    {
        // Check if we are sharing a Image
        if ( [ itemProvider hasItemConformingToTypeIdentifier: ( NSString * ) kUTTypeImage ] )
        {
            // Load it, so we can get the path to it
            [ itemProvider loadItemForTypeIdentifier: ( NSString * ) kUTTypeImage
                                             options: NULL
                                   completionHandler: ^ ( UIImage * image, NSError * error )
             {
                 static int itemIdx = 0;

                 if ( NULL != error )
                 {
                     NSLog( @"There was an error retrieving the attachments: %@", error );
                     return;
                 }

                 // The app won't be able to access the images by path directly in the Camera Roll folder,
                 // so we temporary copy them to a folder which both the extension and the app can access:
                 NSString * filePath = [ self saveImageToAppGroupFolder: image imageIndex: itemIdx ];

                 // Now add the path to the list of arguments we'll pass to the app:
                 [ self addImagePathToArgumentList: filePath ];

                 // If we have reached the last attachment, it's time to hand control to the app:
                 if ( ++itemIdx >= m_inputItemCount )
                 {
                     [ self invokeApp: m_invokeArgs ];
                 }
             } ];
        }
    }
}
- ( void ) invokeApp: ( NSString * ) invokeArgs
{
    // Prepare the URL request
    // this will use the custom url scheme of your app
    // and the paths to the photos you want to share:
    NSString * urlString = [ NSString stringWithFormat: @"%@://%@", APP_SHARE_URL_SCHEME, ( NULL == invokeArgs ? @"" : invokeArgs ) ];
    NSURL * url = [ NSURL URLWithString: urlString ];

    NSString *className = @"UIApplication";
    if ( NSClassFromString( className ) )
    {
        id object = [ NSClassFromString( className ) performSelector: @selector( sharedApplication ) ];
        [ object performSelector: @selector( openURL: ) withObject: url ];
    }

    // Now let the host app know we are done, so that it unblocks its UI:
    [ super didSelectPost ];
}

#ifdef HIDE_POST_DIALOG
- ( NSArray * ) configurationItems
{
    // Comment out this whole function if you want the Post dialog to show.
    [ self passSelectedItemsToApp ];

    // To add configuration options via table cells at the bottom of the sheet, return an array of SLComposeSheetConfigurationItem here.
    return @[];
}
#endif


#ifdef HIDE_POST_DIALOG
- ( void ) willMoveToParentViewController: ( UIViewController * ) parent
{
    // This is called at the point where the Post dialog is about to be shown.
    // Make it transparent, so we don't see it, but first remember how transparent it was originally:

    m_oldAlpha = [ self.view alpha ];
    [ self.view setAlpha: 0.0 ];
}
#endif

#ifdef HIDE_POST_DIALOG
- ( void ) didMoveToParentViewController: ( UIViewController * ) parent
{
    // Restore the original transparency:
    [ self.view setAlpha: m_oldAlpha ];
}
#endif
#ifdef HIDE_POST_DIALOG
- ( id ) init
{
    if ( self = [ super init ] )
    {
        // Subscribe to the notification which will tell us when the keyboard is about to pop up:
        [ [ NSNotificationCenter defaultCenter ] addObserver: self selector: @selector( keyboardWillShow: ) name: UIKeyboardWillShowNotification    object: nil ];
    }

    return self;
}
#endif
#ifdef HIDE_POST_DIALOG
- ( void ) keyboardWillShow: ( NSNotification * ) note
{
    // Dismiss the keyboard before it has had a chance to show up:
    [ self.view endEditing: true ];
}
#endif
@end

2. In the openURL method of your application delegate

           //Slartibartfast -- For the case where we are opening app from an extension
            NSString *STATIC_FILE_HANDLE = @"file://";
           //If app is opened from share extension, do the following
           /*
            1.) Get path of shared file from NSUserDefaults
            2.) Get data from file and store in some variable
            3.) Create a new accesible unique file path
            4.) Dump data created into this file.
            */
   
           NSUserDefaults *defaults=[[NSUserDefaults alloc] initWithSuiteName:YOURAPP_STATIC_APP_GROUP_NAME];
           NSString *path=nil;
           if(defaults)
           {
               [defaults synchronize];
               path = [defaults stringForKey:@"url"];
           }
   
           if(path.length != 0)
           {
               NSData *data;
               //Get file path from url shared
               NSString * newFilePathConverted = [STATIC_FILE_HANDLE stringByAppendingString:path];
               url = [ NSURL URLWithString: newFilePathConverted ];
               data = [NSData dataWithContentsOfURL:url];
               //Create a regular access path because this app cant preview a shared app group path
               NSString *regularAccessPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
               NSString *uuid = [[NSUUID UUID] UUIDString];
               //Copy file to a jpg image(ignore extension, will convert from png)
               NSString *uniqueFilePath= [ NSString stringWithFormat: @"/image%@.jpg", uuid];
               regularAccessPath = [regularAccessPath stringByAppendingString:uniqueFilePath];
               NSString * newFilePathConverted1 = [STATIC_FILE_HANDLE stringByAppendingString:regularAccessPath];
               url = [ NSURL URLWithString: newFilePathConverted1 ];
               //Dump existing shared file path data into newly created file.
               [data writeToURL:url atomically:YES];
               //Reset NSUserDefaults to Nil once file is copied.
               [defaults setObject:nil forKey:@"url"];
   
           }
       //Do what you want
       }
   

感谢EasyNativeExtensions提供的指引。

- Vrashabh Irde

---

非常感谢。这真的帮了我很多。 - Payal Maniyar

你能帮我修复一下这个问题吗？链接是[https://dev59.com/hlUK5IYBdhLWcg3wlQoJ]。 - Tushar Lathiya

Answer 2

1. 如果您不想显示来自苹果的默认对话框。 应该从UIViewController继承，而不是@interface ShareViewController：SLComposeServiceViewController
2. 在苹果开发者文档中，除了今天的扩展应用程序之外，不允许扩展应用程序直接打开包含应用程序。

- HuyLe

---

现在有一些应用程序正在以这种方式使用共享扩展的示例。例如，Pixelmator使用共享操作将图像与Snapseed共享，共享操作没有UI，并且在extensionContext上调用openURL以类似于Today扩展所显示的方式影响共享。另一个例子是，从照片中，您可以将许多图像作为pdf分享到iBooks。如果选择几张图片，则不会呈现UI，如果选择了许多图片，则会显示一个小的UIViewcontrollerv，其中显示进度条，然后打开iBooks并在库中显示PDF。 - Rocket Garden

@RocketGarden，我在我的应用程序中实现了共享扩展，在iOS 13中，我的共享扩展应用程序无法打开主应用程序以接收共享的文件/图像，因为UIApplication.shared现在不可用。之前的所有版本都可以正常工作。那么，开发人员如何从不同的来源接收/导入数据？我想使用苹果共享按钮从gmail或drive或任何地方打开文件到我的应用程序，有什么解决方法吗？今天的扩展提供相同的功能吗？ - Jamshed Alam