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copied!<p>You may know how to present the image picker:</p> <pre><code>UIImagePickerController *picker = [[UIImagePickerController alloc] init]; picker.delegate = self; picker.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypePhotoLibrary]; [viewController presentModalViewController:picker animated:YES]; </code></pre> <p>With the above the viewController implements the UIImagePickerControllerDelegate and make sure you implement this function:</p> <pre><code>- (void)imagePickerController:(UIImagePickerController *)returnedPicker didFinishPickingMediaWithInfo:(NSDictionary *)info </code></pre> <p>and</p> <pre><code>- (void)imagePickerControllerDidCancel:(UIImagePickerController *)returnedPicker </code></pre> <p>The first method is called when user has picked a photo. In this method you get the image using:</p> <pre><code>UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage]; </code></pre> <p>To write this to a file you can make it a JPEG or a PNG. If a JPEG you may do this:</p> <pre><code>[UIImageJPEGRepresentation(image, 1.0) writeToFile:filename atomically:YES]; </code></pre> <p>You just need to set the filename. </p> <pre><code>NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *docsDir = [paths objectAtIndex:0]; NSString *filename = [docsDir stringByAppendingPathComponent:@"myFilename.jpg"]; </code></pre> <p>To get the image back into a UIImage you do this:</p> <pre><code>NSData *data = [NSData dataWithContentsOfFile:filename; if(data != nil) UIImage *image = [UIImage imageWithData:data]; </code></pre>

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