我的应用程序让用户拍摄照片,并在保存前添加叠加层.
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等)分享他的照片,就像Android上的Intent一样.
我试图使用UIDocumentController,但它并不像官方的画廊那样显示Facebook或Twitter.这也使得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？我不会使用Facebook SDK等等.
这是我拍摄照片时所做的：
[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);
}
}];
解决方法
iOS有一个内置的社交共享工具包.您可以通过电子邮件,Facebook和Twitter分享图片.但是,对于使用Google和其他社交服务,您将需要各自的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替换SLServiceTypeFacebook与SLServiceTypeTwitter.
3)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)记住将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)将视图控制器设置为代理
MFMailComposeViewControllerDelegate
- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
[self dismissViewControllerAnimated:YES completion:nil];
}
