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POWhy won't dismissmodalviewcontrolleranimated dismiss UIImagePickerController immediately on ios5?
 

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  1. POWhy won't dismissmodalviewcontrolleranimated dismiss UIImagePickerController immediately on ios5?
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    <p>I have a UITableViewController that pops up a UIImagePickerController, user takes a pic, hits the Use button, Picker dismisses to show a custom thumbnail spinner while the image is being processed, then the spinner is replaced by the actual thumbnail at the end of processing.</p> <p>At least that's how it worked in iOS4. Now with iOS5 it just sits there processing until it's finished, and then everything works correctly. But I want that spinner in there so the user knows something's happening, otherwise it looks like it just hung.</p> <p>So I have this:</p> <pre><code>- (void) actionSheet: (UIActionSheet *)actionSheet didDismissWithButtonIndex (NSInteger)buttonIndex { UIImagePickerController *picker = [[UIImagePickerController alloc] init]; picker.delegate = self; picker.allowsEditing = NO; // yada, yada, yada [self presentModalViewController:picker animated:YES]; [picker release]; } </code></pre> <p>And then this gets called when the user picks "Use":</p> <pre><code>- (void) imagePickerController: (UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { [self dismissModalViewControllerAnimated:YES]; [self performSelectorOnMainThread:@selector(processImage:) withObject:info waitUntilDone:NO]; animate = true; } </code></pre> <p>And then this gets called to perform the processing while the thumbnail is spinning:</p> <pre><code>- (void) processImage:(NSDictionary *)info { UIImage *image = nil; NSString* mediaType = [info objectForKey:UIImagePickerControllerMediaType]; // processing of image animate = false; [activityImageView stopAnimating]; [activityImageView release]; [self.tableView reloadData]; } </code></pre> <p>Like I said, it worked perfectly with iOS4, but with iOS5, no such luck. So what's the deal? The image picker gets dismissed eventually, so why doesn't it get dismissed immediately?</p>
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    1. COI truly don't know why it should matter, but have you tried replacing `[self performSelector...` with `dispatch_async(dispatch_get_main_queue(), ^{[self processImage:info];});`?
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    2. COGood thought, but same behavior. At least I learned something new though!
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