How to remove a null value directly from NSDictionary - iphone

Question

I´m a beginer and have lately got a great deal of trouble with this issue.
I want to pass a NSDictnonary Data to a server from my app and in some cases if the user hasen´t chosen any option I want to remove nil objects.
I have looked into this thread that seems be the right method but I haven't succeed to implement in my code.
How to remove a null value from NSDictionary
My guess would be to implement the code to Null directly in my NSDictonary
Here´s my Dictionary code
-(NSDictionary*)parametersForCreateActivities
{
NSString *token = [[A0SimpleKeychain keychain] stringForKey:tokenConstant];
NSString *userId = [[A0SimpleKeychain keychain] stringForKey:child_id];
NSString *userCreate = [[NSUserDefaults standardUserDefaults] objectForKey:#"CreateTitle"];
NSString *createDescription = [[NSUserDefaults standardUserDefaults] objectForKey:#"DescriptionText"];
NSString *createTimestart = [[NSUserDefaults standardUserDefaults] objectForKey:#"TimeStartString"];
NSString *createTimestop = [[NSUserDefaults standardUserDefaults] objectForKey:#"TimeStopString"];
NSString *createImage = [[NSUserDefaults standardUserDefaults] objectForKey:#"DefaultcreateImageID"];
NSDictionary *parameters;
if (userId && token) {
parameters = #{child_id: userId, tokenConstant:token, activity_name :userCreate, create_Description :createDescription, create_Timestart :createTimestart, create_Timestop :createTimestop, create_Image :createImage};
}
return parameters;
}
My guess is that It should check somewhere in the code for nil objects and remove theme. But I have really struggled with figuring out how to format the code.
I´m guessing the code should be something like this but I have no idea where to place it and how to format it.
NSMutableDictionary *dict = [parametersForCreateActivities mutableCopy];
NSArray *keysForNullValues = [dict allKeysForObject:[NSNull null]];
[dict removeObjectsForKeys:DefaultcreateImageID];

Answer 1

Try below code
NSMutableDictionary *yourDictionary; // Your dictionary object with data
NSMutableDictionary *updatedDic = [yourDictionary mutableCopy];
for (NSString *key in [yourDictionary allKeys]) {
if ([yourDictionary[key] isEqual:[NSNull null]] || [yourDictionary[key] isKindOfClass:[NSNull class]]) {
updatedDic[key] = #"";
}
}
yourDictionary = [updatedDic copy];
NSLog(#"%#",yourDictionary);