我的应用让用户拍照，并在保存之前添加叠加层。

我想让用户使用任何能够处理图像的应用程序(即:电子邮件、facebook、twitter...)分享他的照片，就像 Android 上的 Intent。

我尝试使用 UIDocumentController，但它不像在官方图库中那样显示 Facebook 或 Twitter。这也会让我的应用程序在拍摄第二张照片后崩溃。

有没有简单的方法呢？我不想使用 Facebook SDK 等。

拍照时我是这样的:

[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);
     }

 }];

最佳答案

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) 对于 Facebook

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)记得在你的项目中添加Social.Framework和下面的头文件

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

5) 将您的 View Controller 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];
}

关于iOS 在社交网络上分享图片，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17595251/