iOS8 Day-by-Day :: Day 4 :: Custom Fonts in Interface Builder

Written by Sam Davies

Updated 9 Apr 2015: This post has been updated to Swift 1.2

This post is part of a daily series of posts introducing the most exciting new parts of iOS8 for developers – #iOS8DayByDay. To see the posts you’ve missed check out the index page, but have a read through the rest of this post first!

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It is not unreasonable to want to use custom fonts in your apps, and it has been possible to do so for a while on iOS. However, it has always been troublesome designing the UI in Interface Builder, since you have to build your interface with the system font. This resulted in building and running your app repeatedly to get the desired result.

Well, Xcode 6 finally changes this! Now, any custom fonts present in your app’s bundle will be available in Interface Builder, and will render as they would look in your running. This will be a noticeable jump in productivity, and you’ll learn how easy it is to use in today’s day-by-day article.

There isn’t really any source code associated with today’s post, but there is a project which demonstrates the functionality. The code is available on github at

Font availability within Interface Builder

Interface Builder is able to pick up any fonts that are part of your app’s bundle, and the easiest way to ensure this is to drag your ttf or otf file from the finder into the app:

Font Installation

Then, you’ll be able to select this font using the attributes inspector in Xcode, when editing a xib or storyboard file:

Font Selection

This will then update the appearance of the view appropriately in Interface Builder:

Font Appearing in IB

This is great, but if you run your app up now, then you’ll very quickly realise that it’s not a completely happy story:

Font not working

Declaring fonts for use within your app

The reason that your font isn’t being picked up at runtime, is because although Interface Builder is able to pick up any fonts in the bundle, you still have to declare them in the plist (as before) in order to use them.

This is as simple as opening up the app’s Info.plist file, either directly from the project navigator, or using the Info tab of the target’s settings page, and adding the font:

Adding font to PList

You can run your app up again now, and this time you’ll see it working!

Font working


Today’s was quite a short post, but it represents a fix in Interface Builder which has been niggling at developers for a long time. I think that the little bits and pieces like this that Apple has been working on within the developer toolset demonstrates their commitment to making the process much more friendly.

As ever, the demo project is available on github at If you have any questions, comments, or just want to say hi, I’m @iwantmyrealname on twitter.