Instagram直接打开UTI

我最近偶然发现了以下有趣的功能：Instagram iPhone 挂钩 http://instagr.am/developer/iphone-hooks/

我想知道是否能够立即通过 uidocumentinteractioncontroller 打开应用程序，WITHOUT必须显示预览 (–presentPreviewAnimated:) 或操作表 (–presentOpenInMenuFromRect:inView:animated:)。在我看来，这是唯一的方法，但我可能会错过一些东西。

-(void) saveToInstagram {
    NSURL *url;
    UIDocumentInteractionController *dic;
    CGRect rect = CGRectMake(0 ,0 , 0, 0);
    UIImage *i = imageView.image;
    CGRect cropRect = CGRectMake(i.size.width - 306 ,i.size.height - 306 , 612, 612);
    NSString  *jpgPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.ig"];
    CGImageRef imageRef = CGImageCreateWithImageInRect([imageView.image CGImage], cropRect);
    UIImage *img = [[UIImage alloc] initWithCGImage:imageRef];
    CGImageRelease(imageRef);

    [UIImageJPEGRepresentation(img, 1.0) writeToFile:jpgPath atomically:YES];
    url = [[NSURL alloc] initFileURLWithPath:jpgPath];
    dic = [self setupControllerWithURL:url usingDelegate:self];
    [dic presentOpenInMenuFromRect:rect inView:self.view animated:YES];
    [dic retain];
    [img release];
    [url release];
}

- (UIDocumentInteractionController *) setupControllerWithURL: (NSURL*) fileURL usingDelegate: (id <UIDocumentInteractionControllerDelegate>) interactionDelegate {

    UIDocumentInteractionController *interactionController = [UIDocumentInteractionController interactionControllerWithURL: fileURL];
    interactionController.delegate = interactionDelegate;

    return interactionController;
}

- (void)documentInteractionControllerWillPresentOpenInMenu:(UIDocumentInteractionController *)controller {

}

首先使用 .ig 或 .igo 扩展名而不是 .jpg 或 .jpeg 保存 JPEG，然后使用 file:// 指令创建 NSURL。此外，我还使用 .igo 扩展名和 UTI com.instagram.exclusivegram 来获得 Instagram 的独占权，但您可以使用 .ig 扩展名和 UTI com.instagram.gram

例如：

// URL TO THE IMAGE FOR THE DOCUMENT INTERACTION
NSURL *igImageHookFile = [[NSURL alloc] initWithString:[[NSString alloc] initWithFormat:@"file://%@", jpgPath]];

docInteractionController.UTI = @"com.instagram.exclusivegram";
[self setupDocumentControllerWithURL:igImageHookFile];

// OPEN THE HOOK
[docInteractionController presentOpenInMenuFromRect:self.frame inView:self animated:YES];