Iterating over a NSDictionary to add values to an object - ios

Question

I am trying to iterate through a NSDictionary and add all the values in that dictionary to an object. So i added new cocoa class file to my project and subclassed it with NSObject. (named it customClass)
In my custom class.h:
- (void)printDir; // iterate through the direcory and print it.
#property (nonatomic, retain) NSMutableDictionary *objDictionary;
In customClass.m the defination of printDir method is as:
- (void)printDir {
_objDictionary = [[NSMutableDictionary alloc ]init];
for(id key in _objDictionary) {
id value = [_objDictionary objectForKey:key];
NSLog(#"Values in Objects Dictionary");
NSLog(#"%#",value);
}
}
In my ViewController.m i am trying to iterate through a NSDirectory and add all the values of that directory to the NSMutableDictionary of the object. For which,
for(id key in jsonDictionary.allKeys) {
id value = [jsonDictionary objectForKey:key];
[obj.objDictionary setObject:value forKey:key];
}
When i run the project the printDir method of the object get called, however the for loop does not execute. Can someone point out where i am going wrong. Thanks.

Answer 1

_objDictionary = [[NSMutableDictionary alloc ]init];
Change this line in your printDir method to init method of your custom class. The problem now is each time when you reach your printDir method, it is re-assigning the _objDictionary to nil. So the loop will not execute

Answer 2

In printDir Function you are allocating a dictionary objDictionary again.... so it over right your actual value supplies by your view controller .... You just change your function to this
In .h file
- (void)printDirwithDictionary :(NSMutableDictionary *)dict;
And in .m file
- (void)printDirwithDictionary:(NSMutableDictionary *)dict {
_objDictionary = [[NSMutableDictionary alloc] initWithDictionary:dict]
for(id key in _objDictionary) {
id value = [_objDictionary objectForKey:key];
NSLog(#"Values in Objects Dictionary");
NSLog(#"%#",value);
}
}
In ViewController.m Follow This code
NSMutableDictionary *dictToPass = [[NSMutableDictionary alloc]init];
for(id key in jsonDictionary.allKeys) {
id value = [jsonDictionary objectForKey:key];
[dictToPass setObject:value forKey:key];
}
[obj printDirWithDictionary:dictToPass];
And Call from View Controller will be like this
And Then Follow the sameprocedure . Hope This will Work Properly .