When you create new date using [NSDate date] (i.e. today, as in right now) your date will save the current time as well as its date. In fact, under the hood an NSDate object is the amount of seconds that have elapsed since the 1st of January 2001 (or 1970), in milliseconds. So really it’s […]
Imagine you had two NSDate objects and you’d like to find out the time interval between those dates. NSDate objects alone won’t help us out there unless we do some serious NSDateFormatting and hair pulling. Lucky for us there are a few other classes available that will help us do this, namely NSCalendar and NSDateComponents. […]
In this podcast I will show you how to disable user registrations on your WordPress website. If you don’t have a legitimate reason to invite users to register themselves you’re leaving your site open to spammers who may from time to time try to “get in” (and we want to make sure we keep them … Read more
In UINavigationController speak, we “push” new controllers onto the stack (go forward), and we “pop” them off the stack (go back). The navigation controller handles all this for us. If you want to go back exactly one view controller, here’s how you can do it programmatically: // pop back to previous controller NSArray *myControllers = […]
In Your Storyboard I didn’t know the storyboard could do this, but it can: Select the Navigation Bar in question, then check the Attributes Inspector: In Code To set the title in code, you need to address the self.navigationItem.backBarButton property of your view controller and pass it a new UIBarButtonItem. Here’s one way of doing […]
The easiest way to access a readily available save method is by importing AppDelegate into the class that wants to execute the save. Then we call a method in AppDelegate: AppDelegate *myAppDelegate = (AppDelegate *)[[UIApplication sharedApplication]delegate]; [myAppDelegate saveContext]; No reference to fetchedResultsController or managedObjectContext or any complex &error statements.
Protocols are a great way to delegate responsibility from one class to another. Consider a view controller that brings up another view controller via a modal segue. Let’s call them ViewController and DetailViewController. When it comes to dismissing that DetailViewController, he could do it himself via [self dismissViewControllerAnimated:YES completion:nil]; However, the first ViewController wouldn’t be […]
Sometimes Xcode does a bit of magic behind the scenes which I don’t really understand. Consider this standard table view method to display cells: – (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@”Cell”]; // populate your cell return cell; } Where do we actually ever create a UITableViewCell? All we’re asking here […]
