iPhone:Store & Retrieve NSMutableArray object - objective-c

Question

appDelegate.categoryData = [NSMutableDictionary dictionaryWithObjectsAndKeys:
categoryStr, #"name",image ,#"image", nil];
[appDelegate.categories addObject:appDelegate.categoryData];
NSLog(#"Category Data:--->%#",appDelegate.categories);
I am successfully added object mutabledictionary into mutuablearray but I want to store that array and retrieve when application is launched so please give me idea to develop this functionality.
Thanks in advance.

Answer 1

//you can save array in NSUserDefaults like below
if ([[NSUserDefaults standardUserDefaults] valueForKey:#"detail"]==nil)
{
NSMutableDictionary *dic_detail = [NSMutableDictionary dictionaryWithObjectsAndKeys:
categoryStr, #"name",image ,#"image", nil];
NSMutableArray *ary_detail = [[NSMutableArray alloc] init];
[ary_detail addObject:dic_detail];
[[NSUserDefaults standardUserDefaults] setObject:ary_detail forKey:#"detail"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
//if you want read that array you can read like below in your app
NSMutableArray *array = [[NSMutableArray alloc] initWithArray:[[NSUserDefaults standardUserDefaults] objectForKey:#"detail"]];
- (void)applicationDidEnterBackground:(UIApplication *)application {
NSLog(#"applicationDidEnterBackground = %#",[[NSUserDefaults standardUserDefaults] objectForKey:#"detail"]);
}
- (void)applicationWillEnterForeground:(UIApplication *)application {
NSLog(#"applicationWillEnterForeground = %#",[[NSUserDefaults standardUserDefaults] objectForKey:#"detail"]);
}
in my log its printing like this
applicationDidEnterBackground = (
{
image = img1;
name = cat1;
}
applicationWillEnterForeground = (
{
image = img1;
name = cat1;
}

Answer 2

Perhaps something like this:
NSMutableArray * array = [NSMutableArray array];
appDelegate.categoryData = [NSMutableDictionary dictionaryWithObjectsAndKeys:
categoryStr, #"name",
image ,#"image",
array, #"array", nil];

Answer 3

Something like:
On Application launch:
[[NSUserDefaults standardUserDefaults] registerDefaults:
[NSDictionary dictionaryWithObjectsAndKeys:
[NSArray new], #"StoredArray", nil]];
In your class that "owns" control of the array:
- (void)setArray:(NSMutableArray *)array {
[[NSUserDefaults standardUserDefaults] setObject:array forKey:#"StoredArray"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
- (NSArray*)array {
return [[[NSUserDefaults standardUserDefaults] arrayForKey:#"StoredArray"] mutableCopy];
}
Hope this helps!