iOS 自定义附件无法直接从消息中打开

iOS Custom attachment not opening directly from Messages

我有一个自定义文件 UTI 附件 几乎 在我的应用程序中作为消息共享时工作。它将文件作为附件嵌入到邮件中,文件类型为 'kitlist',并且在 iPad 和 iPhone 上都可以收到。如果您点击正常消息显示中的附件,则不会发生任何事情。但是,如果您点击右上角的信息按钮,然后选择附件,点击文件并共享,该应用程序将显示为可能的目的地。选择它将在我的应用程序中成功打开文件。目前,选择邮件作为共享目的地不会导致附件出现在电子邮件中;我不知道这是不是 relevant.I我也尝试过使用子类 UIActivityItemProvider 而不是实现协议 UIActivityItemSource 子类 NSObject 但没有区别。空投到另一个 iOS 设备工作正常。

这是我的 plist 的相关片段:

<key>CFBundleDocumentTypes</key>
<array>
    <dict>
        <key>CFBundleTypeIconFiles</key>
        <array/>
        <key>CFBundleTypeName</key>
        <string>KitList Transfer File Type</string>
        <key>CFBundleTypeRole</key>
        <string>Editor</string>
        <key>LSHandlerRank</key>
        <string>Owner</string>
        <key>LSItemContentTypes</key>
        <array>
            <string>co.SM.KitListFile.kitlist</string>
        </array>
    </dict>
</array>
<key>UTExportedTypeDeclarations</key>
<array>
    <dict>
        <key>UTTypeConformsTo</key>
        <array>
            <string>public.data</string>
        </array>
        <key>UTTypeDescription</key>
        <string>KitList Transfer File</string>
        <key>UTTypeIdentifier</key>
        <string>co.SM.KitListFile.kitlist</string>
        <key>UTTypeSize320IconFile</key>
        <string>BergenBig</string>
        <key>UTTypeSize64IconFile</key>
        <string>Bergen</string>
        <key>UTTypeTagSpecification</key>
        <dict>
            <key>public.filename-extension</key>
            <string>kitlist</string>
        </dict>
    </dict>
</array>

制作附件的代码是:

@interface SMCustomAttachmentTransfer()
@property (nonatomic, strong) NSMutableArray *images;

@end

@implementation SMCustomAttachmentTransfer

- (void)encodeWithCoder:(NSCoder *)aCoder
{
    self.images =  [NSMutableArray array];
    [aCoder encodeObject:self.list forKey:@"list"];
    [self walkTheList:[self.list valueForKey:keySubItems] withCoder:aCoder];
    [aCoder encodeObject:self.images forKey:@"images"];
}

- (void)walkTheList:(NSDictionary *)items withCoder:(NSCoder *)aCoder
{
    for (NSDictionary *item in items)
    {
        if ( [item valueForKey:keyDetailImage] )
        {
            [self.images addObject:[item valueForKey:keyDetailImage]];
            NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
            NSString *documentsDirectory = [paths objectAtIndex:0];
            NSString *getImagePath = [documentsDirectory stringByAppendingPathComponent:[item valueForKey:keyDetailImage]];
            [aCoder encodeObject:[NSData dataWithContentsOfFile:getImagePath] forKey:[item valueForKey:keyDetailImage]];
        }
        if ( [item valueForKey:keySubItems] )
        {
            [self walkTheList:[item valueForKey:keySubItems] withCoder:aCoder];
        }
    }
}

- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super init];
    if (self)
    {
        self.list = [aDecoder decodeObjectForKey:@"list"];
        NSArray *images = [aDecoder decodeObjectForKey:@"images"];
        for (NSString *image in images)
        {
            NSData *pngData = [aDecoder decodeObjectForKey:image];
            NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
            NSString *documentsPath = [paths objectAtIndex:0];
            [pngData writeToFile:[documentsPath stringByAppendingPathComponent:image] atomically:YES];
        }
    }
    return self;
}

- (id)activityViewControllerPlaceholderItem:(UIActivityViewController *)activityViewController
{
    // must be data placeholder for attachment to be embedded in a message.
    return [NSData data];
}

- (NSString *)activityViewController:(UIActivityViewController *)activityViewController subjectForActivityType:(NSString *)activityType
{
    return [self.list valueForKey:keyName];
}

- (id)activityViewController:(UIActivityViewController *)activityViewController itemForActivityType:(UIActivityType)activityType
{
   return [NSKeyedArchiver archivedDataWithRootObject:self];
}

- (NSString *)activityViewController:(UIActivityViewController *)activityViewController dataTypeIdentifierForActivityType:(NSString *)activityType
{
    return @"co.SM.KitListFile.kitlist";
}

几天来我一直在努力解决这个相同的问题。我终于发现消息传递应用程序中的附件实际上 DO 有效!他们只是不从常规视图中打开。在 iOS 中,您必须单击右上角的 i(信息)图标,然后单击 "Attachments" 选项卡来管理您的附件。从那里您可以 select 您的附件,然后 select 将文档导入您的应用程序的操作图标。这似乎应该在主 "messages" 屏幕上工作,但该屏幕似乎只支持公开支持的文档类型,而不支持 "public.data" 类型。我检查了你的代码和你的 info.plist ,一切似乎都很好。我认为在 plist 中要牢记的主要事情是 mime 类型标识符应该以附件使用的实际文件扩展名结尾,您的也是如此。