Opening the Twitter App is pretty much the same as opening the Facebook App discussed earlier, just the URL scheme is different. This is how we open Twitter so people can follow the user (me in this case, versluis). If the call is unsuccessful, we’ll try to open the Twitter page in Safari. And if […]
Thanks to Custom URL Schemes, iOS Apps can register themselves and be “woken up” by another app (such as yours). Many can even accept parameters if you do. Opening another app happens via the UIApplication class, and an NSURL as parameter. Here’s how we open the Facebook App and direct it to open my Pinkstone […]
Adding a Facebook Like button to a website in HTML is extremely easy, thanks to Facebook’s Developer API. But it’s not as straightforward to implement it in an iOS App. Thanks to UIWebViews we can create a small web view, perhaps 80 pixels tall, and load the Facebook Like button into it. Here’s how: – […]
You can create an NSNumber with a BOOL like this: BOOL myBool = YES; NSNumber *boolNumber = [NSNumber numberWithBool:myBool]; NSLog(@”boolNumber is %@”, boolNumber); // gives 1 for YES and 0 for NO It is technically the equivalent of creating an NSNumber with a literal @1 or @0. To turn the NSNumber back into a BOOL […]
The NSDictionary class doesn’t have a length property that can tell us how much memory is being used for storing the whole lot. Usually we don’t really care how big our variables grow – but if you’re storing that dictionary somewhere with potentially limited space (such as iCloud Key/Value storage), it may well be of […]
Tab Bar Controllers are setup with an array of view controllers. We’ll create those first, then we simply give said array to our tab bar controller. In this example, this is a subclass of UITabBarController: – (void)viewDidLoad { [super viewDidLoad]; // let’s create several View Controllers with different colours each ViewController *vc1 = [self createViewcontrollerWithColor:[UIColor […]
When users add a bookmark of your website to their iOS Home screen, the device takes a rather ugly screenshot and uses it as an icon. It doesn’t really look like an app when viewed among many other apps on the Springboard. But there is a simple way to add your own App Icon to … Read more
You can switch out the NSPersistentStore file in your running Core Data app by first adding your new store file, then removing the previous one. Once done you must execute your fetch request again so that the new data is available. Hot-swapping stores assumes both NSPersistentStore files are based on the same model. It’s like […]
