NSURLConnection returns old data although NSURLRequestReloadIgnoringLocalAndRemoteCacheData - objective-c

Question

I’ve got a serious problem. In my app I m downloading a XML-File using NSURLConnection. So far so good. But from time to time, the NSURLConnection returns an old version of the requested file although I set The cachePolicy to NSURLRequestReloadIgnoringLocalAndRemoteCacheData.
The really disgusting part of the bug is, that the connection always return the old version of the file until I active and then deactivate the airplane mode or I rebooted the device.
An other interesting fact is: When I activate Wifi and call the app to reload the file the correct and actual version of the file is returned. But after turning off Wifi the old version is retuned again.
I m really becoming desperate with this problem and hope anybody can help me?
Here is the code from my class, downloading the file:
#import "HTTPReciever.h"
#import "Constants.h"
#interface HTTPReciever ()
#property (strong, nonatomic) NSMutableData *receivedData;
#property (strong, nonatomic) NSString *directoryPath;
#property (strong, nonatomic) NSString *filename;
#property (assign, nonatomic) BOOL storeData;
#end
#implementation HTTPReciever
#synthesize receivedData = _receivedData;
#synthesize delegate = _delegate;
#synthesize directoryPath = _directoryPath;
#synthesize filename = _filename;
- (BOOL)recieveDataFromURL:(NSURL *)url
storeAtDirectoryPath:(NSString *)directoryPath
withName:(NSString *)name
{
[self setDirectoryPath:directoryPath];
[self setFilename:name];
[self setStoreData:YES];
return [self recieveDataFromURL:url];
}
- (BOOL)recieveDataFromURL:(NSURL *)url
{
NSURLRequest *theRequest = [[NSURLRequest alloc] initWithURL:url
cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData
timeoutInterval:cDefaultHTTPTimeOutInterval];
self.receivedData = nil;
self.receivedData = [[NSMutableData alloc] initWithLength:0];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:theRequest
delegate:self
startImmediately:NO];
if ([NSURLConnection canHandleRequest:theRequest] && connection) {
[connection start];
return YES;
} else {
return NO;
}
}
#pragma mark - NSURLConnectionDelegate protocol
- (void)connection:(NSURLConnection *)connection
didReceiveData:(NSData *)data
{
[self.receivedData appendData:data];
}
- (void)connection:(NSURLConnection *)connection
didReceiveResponse:(NSURLResponse *)response
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
[self.receivedData setLength:0];
if ([response isKindOfClass:[NSHTTPURLResponse self]]) {
NSDictionary *headers = [(NSHTTPURLResponse *)response allHeaderFields];
NSString *modified = [headers objectForKey:#"Last-Modified"];
if (modified) {
// not yet used
}
}
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
if (self.storeData) {
[[NSFileManager defaultManager] createDirectoryAtPath:self.directoryPath
withIntermediateDirectories:YES
attributes:nil
error:nil];
[self.receivedData writeToFile:[NSString stringWithFormat:#"%#%#", self.directoryPath, self.filename]
atomically:YES];
}
[self.delegate receiver:self
didFinishLoadingData:self.receivedData
lastVersion:YES];
}
- (void)connection:(NSURLConnection *)connection
didFailWithError:(NSError *)error
{
[self.delegate receiverFailedLoadingData:self];
}
- (NSCachedURLResponse *)connection:(NSURLConnection *)connection
willCacheResponse:(NSCachedURLResponse *)cachedResponse
{
return nil;
}
#end