Add Mutable Dictionary to a Mutable Dictionary for conversion to JSON - xcode

Question

I am trying to build a dictionary which has as dictionary within it (eventually I hope to convert to a JSON). The problem is I am having problems building it.
So far I have this, what it should do is build a small dictionary with keys and add it to a larger dictionary, reset and then load the small dict and then add it to the large one.
NSMutableDictionary *nestedList = [[NSMutableDictionary alloc]init];
NSMutableDictionary *nestedSections = [[NSMutableDictionary alloc] init];
[nestedList addEntriesFromDictionary:[NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:46], #"menuHeight",
#"editText", #"menuMethod",
[NSNumber numberWithInt:1], #"menuOption",
nil]];
[nestedSections addEntriesFromDictionary:[NSDictionary dictionaryWithObjectsAndKeys:
nestedList, "#Basic",
nil]];
[nestedList removeAllObjects];
[nestedList addEntriesFromDictionary:[NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:92], #"menuHeight",
#"sendText", #"menuMethod",
[NSNumber numberWithInt:1], #"menuOption",
nil]];
[nestedSections addEntriesFromDictionary:[NSDictionary dictionaryWithObjectsAndKeys:
nestedList, "#Pro",
nil]];
I then hoped to address like so;
NSString *string = [[nestedSections objectForKey:#"Pro"] objectForKey:#"menuMethod"];
NSLog(#"Method is : %#", string);
Log would hope to read sendText
The first dictionary builds fine but as soon as I try and add it to the second t bums out with EXC_BAD_ACCESS
I think it is a memory addressing problem because they are both mutable but I am not sure, maybe nestedList should not be mutable. Any help appreciated.
Ultimately I would like to convert this to a JSON like;
{
"Basic":
{
"menuHeight":"46",
"menuMethod":"editText",
"menuOption":"1",
},
"Pro":
{
"menuHeight":"96",
"menuMethod":"sendText",
"menuOption":"1",
}
}

Answer 1

A. NSMutableDictionary does not copy the values (only the keys). Therefore you add the same dictionary two times and change both (= the one) when removing objects and so on. Beside this in your sample JSON the numbers looks like strings not like numbers. I think, that this is a typo.
B. Adding modern Objective-C for better readability it should look like this:
NSDictionary *basicDictionary =
#{
#"menuHeight" : #46,
#"menuMethod" : "editText",
#"menuOption : #1
}
NSDictionary *proDictionary =
#{
#"menuHeight" : #96,
#"menuMethod" : "sendText",
#"menuOption : #1
}
NSDictionary *nestedSections = #{ #"Pro" : proDictionary, #"Basic" : basicDictionary };