Only the last value of NSMutableDictionary is added to NSMutableArray - iphone

Question

I have tried my best to search for the answers to add NSMutableDictionary to NSMutableArray. Unfortunately, they all asked me to use "[allValues]" which is not what I want.
Here is the issue,
In the header file, I defined,
NSMutableArray *arData;
And in the m file,
arData = [[NSMutableArray alloc] init];
NSMutableDictionary *mutableDictionary5 = [[NSMutableDictionary alloc]init];
for (i=0;i<[[[self rssParser]rssItems]count];i++)
{
Lat = [[[[[self rssParser]rssItems]objectAtIndex:i]lat] doubleValue];
Lng = [[[[[self rssParser]rssItems]objectAtIndex:i]lng] doubleValue];
// Creates a marker in the center of the map.
GMSMarker *marker = [[GMSMarker alloc] init];
marker.position = CLLocationCoordinate2DMake(Lat, Lng);
marker.title = [[[[self rssParser]rssItems]objectAtIndex:i]header];
[mutableDictionary5 setObject:marker.title forKey:#"title"];
[arData setValue:[mutableDictionary5 valueForKey:#"title"] forKey:#"title"];
}
The "arData" only gets the last value of [[[[self rssParser]rssItems]objectAtIndex:i]header].And I am sure mutableDictionary5 gets all the value since I have put the following at the end of the code,
NSLog(#"mutableDictionary5 values=%#",[mutableDictionary5 allValues]);
It prints all the value of the title.
I understand it shouldn't be setvalue, however, I tried to use [mutableDictionary5 allValues], "addobjects", "allkeys". They are not working. What should I do to let the NSMutableArray arData to add all values of title with "title" as the key? thanks.
Sorry for my bad English which is not my native language.

Answer 1

You erroneously use setValue instead of addObject.
[arData addObject:mutableDictionary5];
This will work if you alloc init a new dictionary inside the loop.
If you want to reduce the array to just titles do this after the loop:
NSArray *titleArray = [arData valueForKeyPath:#"title"];
Now you have an array containing just titles.
BTW, you could make some effort to invent better variable names. Note that by convention in Objective-C variable names start with low cap while class names are capitalized.