How do I access an NSMutableDictionary's property inside an array using fast enum?

Question

I have a "bookshelf" array that contains four NSMutableDictionary "book" (which contains three properties), my question is how do I access the hasBeenRead flag/property of the "book" dictionary to find out which book has not been read?

Book(s):

 {
     "title":"Winnie-the-Pooh",
     "author":"A.A. Milne"
     "hasBeenRead": No
 }

Bookshelf:

[
    {
         "title":"Jungle Book",
         "author":"Rudyard Kipling",
         "hasBeenRead":"Yes"
    },
    {
         "title":"Winnie-the-Pooh",
         "author":"A.A. Milne",
         "hasBeenRead":"No"
    },
    {
         "title":"Alice In Wonderland",
         "author":"Lewis Carroll",
         "hasBeenRead":"Yes"
    }
]

I can get the Book NSMutableDictionary:

for (NSString* readBook in self.bookshelf) {
    NSLog(@"Books: %@", readBook);
}

Thanks.

In other words, "How do I use NSArray and NSDictionary?" Two objects that anyone programming in Objective-C should be intimately familiar with. — Hot Licks, Jul 16 '14 at 01:00

score 0 · Answer 1 · answered Jul 15 '14 at 20:11

0

How about:

for (NSDictionary* readBook in self.bookshelf) {
  NSLog(@"Books: %@", [readBook objectForKey:@"hasBeenRead"]);

}

answered Jul 15 '14 at 20:11

Owen Hartnett

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Huy Nghia · Answer 2 · 2014-07-16T00:42:17.640

0

you can filter your bookshelf use NSPredicate

NSString *hasBeenReadFlag = @"No";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF.hasBeeRead == %@", hasBeenReadFlag];
NSArray *filtered = [self.bookshelf filteredArrayUsingPredicate:predicate];
NSLog(@"%@", filtered);

now you can get all book has not been read

Regards

How do I access an NSMutableDictionary's property inside an array using fast enum?

2 Answers2