Question

I want to create a random strings using array of Dictionary. I want to generate the random questions, when user runs the application. I had done with the random strings using arrays. But i couldn’t create random strings using array of dictionary. So how to create a random strings using dictionary. The array of strings would be changed every time, when runs the application, so how can i generate random strings?

For eg:

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"List" ofType:@"plist"];

NSArray* pointStrings = [[NSArray alloc] initWithContentsOfFile:filePath];

My actual array is,

The array is (
        {
        id = 1;
        question = India;
        answer = Punjab;
       },

        {
         id = 2;
         question = Kolkatta;
         answer = "West Bengal";
    },
        {
        id = 3;
        question = Mumbai;
         answer = Maharastra;

    } )

Expected array,

The Random array(

         {
         id = 2;
         question = Kolkatta;
         answer = "West Bengal";
    },
        {
        id = 3;
        question = Mumbai;
         answer = Maharastra;

    },
        id = 1;
        question = India;
        answer = Punjab;
       })

Thanks.

Answer 1

Pugal,

Use NSMutableArray instead of NSArray so that you can have more methods to access,

NSUInteger count = [self count];

for (NSUInteger i = 0; i < count; ++i) { 

    // Select a random element between i and end of array to swap with.       
    int nElements = count - i;
    int n = (random() % nElements) + i;
    [self exchangeObjectAtIndex:i withObjectAtIndex:n];
}

Check the link for further reference: What's the Best Way to Shuffle an NSMutableArray?
Johnson has already explained well in it.