add data to my data member - iphone

Question

Hello I'm new to iPhone development.
I try to add move data from NSDictionary to data member of calls that i created.
When i "setWeightMeasure" nothing happened.
any suggestions?
the code that don't work:
NSDictionary *responseBodyProfile = [responseBody objectFromJSONString];
NSLog(#"%#",responseBodyProfile);
// the output is :
"{ "profile": {"goal_weight_kg": "77.0000", "height_cm": "179.00",
"height_measure": "Cm", "last_weight_date_int": "15452",
"last_weight_kg": "99.0000", "weight_measure": "Kg" }}""
[responseBody release];
if (responseBodyProfile != nil ){
NSDictionary *profile =[responseBodyProfile valueForKey:#"profile"];
NSLog(#"%#\n",[profile objectForKey:#"weight_measure"]);// Output : "kg"
[self.myUser setWeightMeasure:[profile objectForKey:#"weight_measure"]];
NSLog(#"%#", [self.myUser WeightMeasure]); // Output : "(null)"
}
the H file properyty:
#property (nonatomic, retain) UserData* myUser;
UserData.h:
#import <Foundation/Foundation.h>
#interface UserData : NSObject{
NSString* Weight;
NSString* Height;
NSString* GolWeight;
NSString* WeightMeasure;
}
#property (nonatomic, retain) NSString* Weight;
#property (nonatomic, retain) NSString* Height;
#property (nonatomic, retain) NSString* GolWeight;
#property (nonatomic, retain) NSString* WeightMeasure;
#end
UserData.m
#import "UserData.h"
#implementation UserData
#synthesize Weight, Height, GolWeight, WeightMeasure;
-(id)init{
self.Weight = #"0";
self.Height = #"0";
self.GolWeight = #"0";
self.WeightMeasure = #"0";
return self;
}
-(void)dealloc{
[Weight release];
[Height release];
[GolWeight release];
[WeightMeasure release];
[super dealloc];
}
#end

Answer 1

Use valueForKey instead of objectForKey in this line:
[self.myUser setWeightMeasure:[profile objectForKey:#"weight_measure"]];
like this:
[self.myUser setWeightMeasure:[profile valueForKey:#"weight_measure"]];
You might also want to use, since the values could be read as NSNumbers
[self.myUser setWeightMeasure:[[profile valueForKey:#"weight_measure"] stringValue]];
And why do you use strings instead of floats? Wouldn't that make your life easier when you'd need to perform some comparisons?
Also check if you have allocated memory for "myUser", that might be the case as well.

Answer 2

As Eugene mentioned, you should use valueForKey instead of objectForKey
The other thing is you might wanna use property and dot notation whenever you reference your object members, as Apple recommend. It is generally good for you to manage memory.
The previous answer about not initialize your string members in your -init() was totally wrong, if that cause some confusion, I do apologize for it.