Tag Archives: Screencast

How to reset your iCloud Ubiquitous Container

In this screencast I’ll show you how to reset your iCloud Ubiquity Container from an iOS device. This will clear up anything you’ve saved in iCloud Documents and iCloud Core Data and also simulates “first installation”.

Sometimes when you test the same app over and over the container can get corrupted, error messages start flooding in and ultimately your app doesn’t behave as expected – making you doubt your sanity, alienating your friends and family and giving you more grey hair then you need.

If the above still doesn’t work, turn your devices off and on again, restart Xcode and reboot your Mac – a useful tip often forgotten with pesky bugs that don’t make sense (thanks to Eric for reminding me of this).

In a nutshell:

  • remove your app from all devices – this is important because running apps, or existing apps launched will assume there’s data in iCloud and they will try to communicate with your (defunct) container
  • remote all data from the container as described in the video (on iOS, head over to Settings – iCloud – Manage Storage – find your app and select it, hit edit and delete all data)
  • now re-deploy the app to each device via Xcode

For Core Data: the first app that’s launched checks to see if data exists in iCloud, and if not will create the iCloud store. Subsequent apps will see this has been done and read the changes from those mysterious log files.

Removing the container in code

You can also call a method on the NSPersistentStoreCoordinator class to remove the entire ubiquity container. Here’s how to do that:

- (void)deleteCloudContainer {
    // remove this store's iCloud Content
    NSPersistentStore *currentStore = self.managedObjectContext.persistentStoreCoordinator.persistentStores.lastObject;
    NSError *error = nil;
    [self.managedObjectContext reset];
    [self.managedObjectContext.persistentStoreCoordinator removePersistentStore:currentStore error:nil];
    if (![NSPersistentStoreCoordinator removeUbiquitousContentAndPersistentStoreAtURL:currentStore.URL options:currentStore.options error:&error]) {
        NSLog(@"Could not remove iCloud Container. Reason: %@", error.localizedFailureReason);

This does pretty much the same thing as the manual method, although it may take a moment. Works in iOS 7, but I’ve not had much luck in iOS 8 Beta 5 (in fact, I’ve not had much luck with anything in iOS 8 Beta 5).

Core Dara Nugget #1: How to speak Core Data

In this screencast I’ll talk you through the lingo of Core Data: those scary classes and expressions that you’ll frequently come across. In fact, this is the start of a new series:

Core Data Nuggets are bite-sized chunks about the framework. Dip in and out or watch them all in a row and learn how this super complicated framework works and what it has to offer.

Don’t get overwhelmed by Core Data: it wants to help – it’s just not designed with humans in mind.

As always, enjoy!

Creating an In-App Purchase in iOS 7 and Xcode 5.1

In this 7-part screencast series I’ll show you how to create an In-App Purchase in iOS 7 with Xcode 5.1.

The course will run you through everything from setting up your product in iTunes Connect, creating a custom shop class for easy re-use, making “first contact” with the App Store and how to deal with its responses. I’ll explain the overall concept in Part 1.

Parts 1+2 are free to watch. The rest is for members only. Sign up here for full access to see the whole course.

Part 2 describes how to setup your your app for use with In-App purchases. We’ll setup a new App ID in Member Center, and create a product in iTunes Connect.

This content is for members only.

I’m following my earlier two articles almost to the letter, here they are for reference:

How to use Popovers on iPad

In this series I’ll show you how to create Popovers on iPad. They’re fairly easy to create once you get the hang of the inner workings of the UIPopoverController.

I’ll show you how to create basic Popover in code and in your Storyboard, and we’ll discuss how you can retrieve data from a Popover when it’s dismissed. We’ll do this with a simple UIDatePicker. In the last video I’ll demonstrate how you can pick images from the camera roll using the UImagePickerController with a Popover – which is how you’re meant to do it on iPad.

The series contains three videos in total. The first one is “free to air”, and the other two are for members only.


This content is for members only.

How to convert your iPhone Storyboard into an iPad Storyboard

Sometimes it’s just easier to start from an existing Storyboard rather than build everything again from scratch. Especially so when you want to create an iPad version of your iPhone app.

When you change your deployment info to Universal, Xcode even offers to copy your existing storyboard for you. That’s really nice – but even though it behaves like an iPad storyboard, when you open it in Interface Builder it still looks like you’re creating an iPhone layout. This makes re-arranging things difficult.

Help it at hand with a simple tweak. Under the hood, a Storyboard is just an XML file and as such as a plethora of key/value pairs we can change by hand.

First, make sure you display your layouts in “3.5inch” mode. You can do that by clicking that little icon at the bottom of Interface Builder:

Screen Shot 2014-05-19 at 11.20.25

Next head over to the File Inspector and right-click your storyboard, then select “Open as Source Code”. This will display all that XML code.

Screen Shot 2014-05-19 at 11.08.32

In the second line of the document you’ll find a very long line – somewhere in it you’ll find something like this:


Simply change that line to


This will make Interface Builder display your storyboard with iPad characteristics. All we now have to do is to make it look like a Storyboard again rather than XML code – so head back and right-click on the file again, then select “Open as Interface Builder – iOS Storyboard”.

How to use iCloud in your iOS Apps

In this screencast series I’ll show you how to use iCloud in your iOS apps. We’ll discuss the whole picture, starting with how to setup Xcode and your app, including App ID and Provisioning Profiles and I’ll demonstrate how to use all three flavours of iCloud:

  • Key Value Storage
  • Document Storage
  • and iCloud with Core Data

The first two parts are free, and the remainder of this series is for members only.

Setup and Prep Work

In this part I’ll explain how to create an App ID, a Developer Provisioning Profile and how to import it into Xcode. We’ll also discuss what else needs to be setup in Xcode to make your app work with iCloud, no matter which flavour you want to use.

This content is for members only.

Demo Project

Here’s the demo project that I’m building in the last two videos. Don’t forget to change the Bundle ID and your Team ID to make it work on your devices:

Enjoy creating some rad iCloud apps 😉

Further Reading: