Need assistance regarding downloading data using NSURLConnection - objective-c

Question

My app is a messaging app, it can also send image files. I am just uploading as image on web server and on other side just sending its url, with NSURLConnection i am trying to download an image with UIProgressView as a download indicator, here is my code:
This method is called when download button in uitableview is clicked, it removes the download button, add uiprogressview and start downloading
-(void)downloadImage:(UIButton *)link
{
UITableViewCell *cell = (UITableViewCell*)[link superview];
NSIndexPath *pathToCell = [tView indexPathForCell:cell];
NSMutableDictionary *checkItHasFile = [messages objectAtIndex:pathToCell.row];
NSString *str = [checkItHasFile objectForKey:#"hasFile"];
if([str isEqualToString:#"1"])
{
progress = [[UIProgressView alloc]initWithProgressViewStyle:UIProgressViewStyleBar];
progress.frame = CGRectMake(10, 50, 160, 30);
progress.progress = 0.0;
//progress.center = CGPointMake(23,21);
[cell addSubview:progress];
}
UIButton *view = [[UIButton alloc]init];
NSArray *subviews = [cell subviews];
for (view in subviews)
{
if([view isKindOfClass:[UIButton class]])
{
[view removeFromSuperview];
}
}
//
NSString *linkToPass = [NSString stringWithFormat:#"THE URL"];
NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:linkToPass]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if (theConnection)
{
nsmd = [[NSMutableData alloc]init];
}
else
{
NSLog(#"Connection to server failed!");
}
...
This method is a NSURLConnection delegate to indicate about response, in this I am calculating response size
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[self.resourceData setLength:0];
self.filesize = [NSNumber numberWithLongLong:[response expectedContentLength]];
}
This method is a NSURLConnection delegate to indicate about received data, I am updating progress bar by doing some calculation
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
resourceData = [[NSMutableData alloc]init];
[self.resourceData appendData:data];
NSNumber *resourceLength = [NSNumber numberWithUnsignedInteger:[self.resourceData length]];
[self.progress setProgress:[resourceLength floatValue] / [self.filesize floatValue] animated:YES];
}
I want to know when downloding is finished so i can also remove progress view for that the delegate method is connectionDidFinishLoading:connection of NSURLConnection.
Problem is it immediately triggers, so when progress view is animating the download progress this method also executes, if I am removing the progress view here, the progress view will disappear immediately with out indicating a complete download progress.
How to solve this issue?

Answer 1

Define a method that removes the progressbar, then in your - (void)connectionDidFinishLoading:(NSURLConnection *)connection implementation, if the resource length is less than a certain amount you decide, call the remove method with a delay:
[self performSelector:#selector(removeProgressBar) withObject:nil afterDelay:2];
otherwise call the same method without any delay.