Using UIActivityIndicatorView

[franzwarning]

Hey I have this code which uploads an image in the UIImageView to a server. Does anyone know how to add a UIActivityIndicatorView to it so it after I hit the upload button the activity indicator will pop up and will disappear before the last line [self dismissModalViewControllerAnimated:YES];

Cheers,
George

-(IBAction) uploadButtonPressed:(id) sender
{
	
	uploadLabel.hidden = FALSE;
	loadingSquare.hidden = FALSE;
	uploadIndicator.hidden = FALSE;
	[uploadIndicator startAnimating];
	
	
	NSData *imageData = UIImageJPEGRepresentation(imageView.image, 90);
	NSString *urlString = @"http://defendthehouse.com/PhotoQuest/images/upload.php";
	
	NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
	[request setURL:[NSURL URLWithString:urlString]];
	[request setHTTPMethod:@"POST"];
	
	NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
	NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
	[request addValue:contentType forHTTPHeaderField:@"Content-Type"];
	
	NSMutableData *body = [NSMutableData data];
	[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
	[body appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"userfile\"; filename=\".jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
	[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
	[body appendData:[NSData dataWithData:imageData]];
	[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
	[request setHTTPBody:body];
	
	NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
	NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
	
	//	while(returnString != @"Temp file uploaded. \r\n"){
	
	
	[self dismissModalViewControllerAnimated:YES];	
	
	
	
	
}

[harrytheshark]

The method you're using to upload the image is synchronous, so it runs on the main thread, blocking the UI.

You might want to look at an asynchronous equivalent, or run this upload code in a background thread.

If you choose the background thread option, be aware that UI can only be updated on the main thread.

An example of running on a background thread is as follows:

-(IBAction) uploadButtonPressed:(id) sender {
   uploadLabel.hidden = NO;
   loadingSquare.hidden = NO;
   uploadIndicator.hidden = NO;
   [uploadIndicator startAnimating];
   [NSThread detachNewThreadSelector:@selector(theProcess) toTarget:self withObject:nil];
}
- (void)theProcess {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
   // do the upload
   [self performSelectorOnMainThread:@selector(processDone) withObject:nil waitUntilDone:NO];
   [pool release];
}
- (void)processDone {
   // stop the activityIndicator
   [self dismissModalViewControllerAnimated:YES];
}

[franzwarning]

Thank you so much, that worked like a charm!

[harrytheshark]

No problem