Memory don't release - objective-c

Question

Here is my code:
-(void) encodeStationsBack
{
if (context == nil)
{
context = [(radioAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext];
NSLog(#"After managedObjectContext: %#", context);
}
// here is JSON parsing
int i=0;
int count = stations.count;
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Station" inManagedObjectContext:context];
NSMutableArray* parsedData = [[NSMutableArray alloc] init];
while(stations.count > 0) {
NSString*string = [[NSString alloc] initWithString:[stations objectAtIndex:0]];
if (![string isEqual:#""]) {
NSMutableDictionary*dic = [[NSMutableDictionary alloc]init];
// NSLog(#"%#", string);
NSData*data = [[NSData alloc] initWithData:[string dataUsingEncoding:NSUTF8StringEncoding]];
NSMutableDictionary* pars;
#try {
pars = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
}
#catch (NSException *exception) {
NSLog(#"%# , %#", exception.description, exception.reason);
}
#finally {
}
// NSMutableDictionary* pars =[[NSMutableDictionary alloc]initWithDictionary:[NSJSONSerialization JSONObjectWithData:data
// options:kNilOptions/*NSJSONReadingMutableContainers*/ error:nil]];
[pars retain];
[dic setObject:[[pars objectForKey:#"nm"]mutableCopy] forKey:#"nm"];
[dic setObject:[[pars objectForKey:#"btr"]mutableCopy] forKey:#"btr"];
[dic setObject:[[pars objectForKey:#"id"]mutableCopy] forKey:#"id"];
[dic setObject:[[pars objectForKey:#"cntr"]mutableCopy] forKey:#"cntr"];
[dic setObject:[[pars objectForKey:#"gnr"]mutableCopy] forKey:#"gnr"];
[pars release];
#try {
[parsedData addObject:[NSDictionary dictionaryWithDictionary:dic]];
}
#catch (NSException* exc) {
NSLog(#"%#, %#", exc.description, exc.reason);
}
[dic release];
[data release];
[string release];
[stations removeObjectAtIndex:0];
// if (i%1000==0) {
// NSLog(#"nnnn %i %i", parsedData.count, stations.count);
// }
i++;
float k = count;
k = (i + 1)/k;
[self performSelectorOnMainThread:#selector(increaseProgress:) withObject:[NSNumber numberWithFloat:k] waitUntilDone:YES];
}
else {
[stations removeObjectAtIndex:0];
}
}
[stations release];
i = 0;
while (parsedData.count > 0) {
Station*station = [[Station alloc] initWithEntity:entity insertIntoManagedObjectContext:nil];
[station setName:[[[parsedData objectAtIndex:0] objectForKey:#"nm"]mutableCopy]];
[station setBit:[[[parsedData objectAtIndex:0] objectForKey:#"btr"]mutableCopy]];
[station setEnabled:[NSNumber numberWithInt:1]];
//encoding id of the station
unsigned int tempInt;
NSScanner *scanner= [[NSScanner alloc] init];
scanner = [NSScanner scannerWithString:[[parsedData objectAtIndex:0] objectForKey:#"id"]];
[scanner scanHexInt:&tempInt];
NSNumber *numb = [[NSNumber alloc] init];
numb = [NSNumber numberWithInt:tempInt];
numb = [NSNumber numberWithInt: ([numb integerValue] ^ sec )];
[station setNumber: [NSNumber numberWithInt:[numb intValue]]];
//encoding country ID
tempInt = 0;
scanner = [NSScanner scannerWithString:[[parsedData objectAtIndex:0] objectForKey:#"cntr"]];
[scanner scanHexInt:&tempInt];
numb = [NSNumber numberWithInt:tempInt];
numb = [NSNumber numberWithInt:(([numb integerValue] ^ sec ))];
if (![numb isEqualToNumber:[NSNumber numberWithInt:n]])
{
[station setCountryID:[NSNumber numberWithInt:[numb intValue]]];
}
else
{
[station setCountryID:[NSNumber numberWithInt:-1]];
}
//encoding genre ID
tempInt = 0;
scanner = [NSScanner scannerWithString:[[parsedData objectAtIndex:0] objectForKey:#"gnr"]];
[scanner scanHexInt:&tempInt];
numb = [NSNumber numberWithInt:tempInt];
numb = [NSNumber numberWithInt:(([numb integerValue] ^ sec ))];
if (![numb isEqualToNumber:[NSNumber numberWithInt:N]])
{
[station setGenerID:[NSNumber numberWithInt:[numb intValue]]];
}
else
{
[station setGenerID: [NSNumber numberWithInt:-1]];
}
[station setOrder:[NSNumber numberWithInt:i]];
[context insertObject:station];
float k = count;
k = (i + 1)/k;
[self performSelectorOnMainThread:#selector(increaseProgress:) withObject:[NSNumber numberWithFloat:k] waitUntilDone:YES];
// NSLog(#"%i", i);
[parsedData removeObjectAtIndex:0];
[station release];
// [station release];
i++;
}
[parsedData release];
[self performSelectorOnMainThread:#selector(deleteAllFromDB) withObject:nil waitUntilDone:YES];
[context save:nil];
}
I can't understand why my app uses so mutch memory (~150 mb). I tryed to look on my code with analyze. Nothing interestig xCode thinks that all is ok.
Here is what I see with Instruments
Instruments

Answer 1

you have alloced in the loop and de alloced outside the loop in scanner there are other mistakes like this. have a look and make a code review.

Answer 2

id obj1 =[[pars objectForKey:#"nm"]mutableCopy];
[dic setObject:obj1 forKey:#"nm"];
[obj1 release]; // No memory leak
[dic setObject:[[pars objectForKey:#"btr"]mutableCopy] forKey:#"btr"];//memory leak
[dic setObject:[[pars objectForKey:#"id"]mutableCopy] forKey:#"id"];//memory leak
[dic setObject:[[pars objectForKey:#"cntr"]mutableCopy] forKey:#"cntr"];//memory leak
[dic setObject:[[pars objectForKey:#"gnr"]mutableCopy] forKey:#"gnr"];//memory leak
Change all setObject:forKey: