ios - 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

我已经为我的应用程序添加了一个共享扩展名为 SAMPLE(已存在于应用商店中)，名为 lets say SAMPLESHARE。每当用户拍摄照片并尝试分享时，我希望他们通过 Open In 功能的 View Controller ，而不是从 Apple 获得 Post 对话，基本上绕过它。因此，我试图在共享扩展和我的应用程序之间共享图片，方法是创建一个在应用程序和插件之间共享的应用程序组，然后将文件路径传递到我的应用程序的应用程序委托(delegate)的 openURL。

所以在我的主要应用程序委托(delegate)中我有

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

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

如果我有一个需要打开不同流程的 URL 文件路径，我基本上每次都用它来检查。

在我的 SHAREEXTENSION 中有

#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

我的扩展名 info.plist 是

<?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>

我基本上使用了互联网(知名网站)上的一些公共(public)许可代码，这些代码声称已经通过了应用程序商店的审核流程。

代码中有两种变通方法，一种是从共享扩展中调用 OpenURL(从搜索 SO 看来，如果没有 iOS 8.3 及更高版本的变通方法，这似乎仍然不可能正常进行)，第二种是隐藏帖子对话以及当任何人点击共享时苹果默认提供的键盘。这行得通。

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:

因此，通过搜索文档，我找到了问题 2 的修复程序，并对其进行了更改。现在一切正常，并且没有 TRUEPREDICATE，这会在商店中被接受还是有其他方法可以做到这一点？

更新 2:

我现在已经使用 NSUserDefaults 将数据从扩展程序传递到应用程序，我猜这也是共享数据的一个要求。

Answer 1

更新

该应用程序使用 NSUSERDEFAULTS 作为消息传递机制在审核中被接受。这是步骤。

1.) 共享扩展:

#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

1. 在您的应用程序委托(delegate)的 openURL 方法中

           //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求指点