Question

I need some help with an app. I need to make a random number generator for integers between zero and fifteen, which will then, depending on which number is created, push to a view with the corresponding number.
This is how I want it to work

Push a button –> random number generator gives a number between 0 and 15 –> view pushes to another view that has been assigned the number that the random number generator gave.

Can anybody help me with the code?
Thanks

Answer 1

arc4random() is the standard Objective-C random number generator function. It’ll give you a number between zero and… well, more than fifteen! You can generate a number between 0 and 15 (so, 0, 1, 2, … 15) with the following code:

NSInteger randomNumber = arc4random() % 16;

Then you can do a switch or a series of if/else statements to push a different view controller:

UIViewController *viewController = nil;
switch (randomNumber)
{
    case 0:
        viewController = [[MyViewController alloc] initWithNibName:@"MyViewController" bundle:nil];
    break;
    // etc ...
}

[self.navigationController pushViewController:viewController animated:YES];

Or rather, upon rereading the question, it would look like the following:

UIViewController *viewController = [[MyViewController alloc] initWithNibName:@"MyViewController" 
viewController.number = randomNumber;

And you’d have an NSInteger property on the MyViewController subclass.