Does while (condition) {} collpses connections by NSRURLConnection? - ios

Question

I've changed my old NSthread because couldn't update UI from a background thread. Now I'm using dispatch_async.
The problem is when this code is executed the second time, in ApplicationDidBecomeActive (when user hide and show again de application) Never exit from that while, keeps in infinite loop.
Here I show the new code about dispatch_async, the NSURLConnection code always worked , resume at the end... I don't think the problem is there
- (void)applicationDidBecomeActive:(UIApplication *)application
{
// first connection to the server through NSURLConnection, downloading a json list
[wsDataVideos getVideosData:URL_WS_VIDEOS];
dispatch_queue_t secondDownloadQueue = dispatch_queue_create("name",NULL);
dispatch_async(secondDownloadQueue, ^{
// wait for wsDataVideos has finished. IT SEEMS THIS COLLAPSES CPU ¿?
while (wsDataVideos.imported==NO) {}
// If are there new videos begins sincronous and slower download:
if ....{
dispatch_async(dispatch_get_main_queue(), ^{
// Update the UI: inform user begins download
[menuViewController.badgeVideos setBadgeVideosText:#"Downloading..."];
});
// Download videos (sincro)
dispatch_async(dispatch_get_main_queue(), ^{
// informs user is completed
[menuViewController.badgeVideos setBadgeVideosText:#"Downloaded"];
});
}
});
}
The first connection (json), than I wait in that while :
-(void)getVideosData:(NSString *)url_ws{
NSLog(#"Get videos data1 ");
if (wsData){
[wsData setLength:0];
}
else{
wsData=[[NSMutableData alloc] init];
}
NSURLRequest *reqCat=[NSURLRequest requestWithURL:[NSURL URLWithString:url_ws] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
NSURLConnection *conCat=[[NSURLConnection alloc] initWithRequest:reqCat delegate:self];
}
with their methods:
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
...
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
[wsData appendData:data];
}
...
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
...
Any ideas? thanks again.

Answer 1

If I put code inside while{} it works, but i think this is somthing odd..chunk, bad code, isn't it?
Maybe a better soluttion would be somthing like dispatch_group_wait() ?
// wait for wsDataVideos has finished. IT SEEMS THIS COLLAPSES CPU ¿?
while (wsDataVideos.imported==NO) {
sleep(1)
}