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我的应用程序让用户拍照，并在保存之前添加叠加层。

我想让用户使用能够处理图像的任何应用程序（即：电子邮件、脸书、推特......）分享他的照片，比如 Android 上的 Intent。

我尝试使用 UIDocumentController，但它没有像在官方图库中那样显示 Facebook 或 Twitter。它还使我的应用程序在拍摄第二张照片后崩溃。

有没有一种简单的方法可以做到这一点？我不想使用 Facebook SDK 等。

这是我在拍照时所做的：

[stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:
 ^(CMSampleBufferRef imageSampleBuffer, NSError *error) {

     if(!error){
         //Resize the picture and add the overlay
         UIImage *picture = [self imageFromSampleBuffer:imageSampleBuffer];
         //Custom code letting me save the picture in a specific album
         [self.library saveImage:picture toAlbum:@"myApp" metadata:metadata withCompletionBlock:^(NSError *error,NSURL* assetURL) {
             if (error!=nil) {
                 NSLog(@"Big error: %@", [error description]);
             } else {
                 NSLog(@"Image Saved");

                NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"tmp.jpg"];
                //Only way to use UIDocumentController is to save the file at a known location
                NSData* imagedata = UIImageJPEGRepresentation(picture, 0.9f);
                [imagedata writeToFile:path atomically:NO];
                NSLog(@"%@",path);
                docController.URL = [NSURL fileURLWithPath:path];
                 // This make my app crash after the second picture
                 [docController presentPreviewAnimated:YES];
            }
         }];

     } else {
         NSLog(@"%@",error);
     }

 }];
4

1 回答 1

13

iOS 有一个内置的社交分享工具包。您可以通过电子邮件、Facebook 和 Twitter 共享图像。但要使用 Google+ 和其他社交服务，您将需要它们各自的 SDK。

1) 脸书

SLComposeViewController *controller = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeFacebook];
    [controller setInitialText:message];
    [controller addImage:image];
    [self presentViewController:controller animated:YES completion:Nil];

2) 对于 twitter，将 SLServiceTypeFacebook 替换为 SLServiceTypeTwitter。

3) 对于电子邮件

MFMailComposeViewController *emailShareController = [[MFMailComposeViewController alloc] init];
    emailShareController.mailComposeDelegate = self;
    [emailShareController setSubject:@"Share Image"];
    [emailShareController setMessageBody:message isHTML:NO];
    [emailShareController addAttachmentData:UIImageJPEGRepresentation(image, 1) mimeType:@"image/jpeg" fileName:@"your_image.jpeg"];
    if (emailShareController) [self presentViewController:emailShareController animated:YES completion:nil];

4）记得将Social.Framework添加到您的项目和以下头文件中

#import <MessageUI/MFMailComposeViewController.h>
#import <Social/Social.h>
#import <MobileCoreServices/MobileCoreServices.h>

5）将您的视图控制器设置为

MFMailComposeViewControllerDelegate

发送邮件后关闭 MailViewController -

- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
    [self dismissViewControllerAnimated:YES completion:nil];
}
于 2013-07-11T16:02:00.043 回答