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 […]
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 […]
In Xcode 4 there was an option that read “Icon already has gloss effect”. This was available in the Project Settings, as well as a Plist Option under Info. YES would remove the gloss effect. The above option still works in Xcode 5 unless you use an Asset Catalogue. If you do, here’s where the […]
To convert a file path into an NSURL: NSURL *localURL = [NSURL fileURLWithPath:localPath]; To create a local path from an NSURL: NSString *localPath = [localURL filePathURL]; NSURLs can also be created directly from an NSString: NSURL *yourURL = [[NSURL alloc]initWithString:@”http://wpguru.co.uk”]; // or NSURL *yourURL = [NSURL URLWithString:@”http://wpguru.co.uk”]; If you’re ever tried to pass a local […]
If Device A saves or changes a file in your app’s iCloud folder, Device B might want to know about this. So you’d imagine there should be an easy way to monitor those changes by way of a notification or a delegate. Sadly there isn’t. Like many things in Objective C, this is way more […]
Sometimes it can be difficult to find which of your own apps are installed on a device, especially when you’ve made so many over the years and also have installed countless ones from the app store. Here’s how to list “your apps” in Xcode 5: connect the device head over to Window – Organizer – […]
