How to support preferred content size part 4 — Read part 3: Scale custom fonts Not all the UI elements need to rescale their fonts or icons when you are supporting preferred content size in your app. Elements like the status bar, navigation bar, tab bar, or toolbar would take up too much space leaving less for the real…

How to support preferred content size part 3 — Read part 2: Support text scaling Since iOS 11 the class UIFontMetrics is available. To support dynamic type with custom fonts, you create instances of this class and pass in one of the text styles. Each text style scales differently from one another. You can see in the table below…

How to support preferred content size part 2 — Read part 1: Change text size To support text scaling, you need to configure your labels to use the preferred content size category set by the user. Instead of applying a fixed font size to a label, you apply a text style. Use text styles Since iOS 7, Apple provides eleven different text…

How to support preferred content size part 1 — One in every three app users in the Netherlands has set their text size to a different size set as the default size. 13% of the users set this to a smaller font, and 20% to a larger font. In particular, elderly people who have worse vision and people with…

Formatters take data like numbers, dates, times and more and convert it into a localized and user-presentable string. Because formatters are backed by quite a bit configuration data, a common pattern was to cache and reuse them: class Meeting { private static let dateFormatter: DateFormatter =…

How to develop accessible iOS apps — When a user navigates your app with an assistive technology, the interface is not the same as the one visible on the screen. They navigate a modified version that iOS creates, called the accessibility tree or Accessibility UI (AUI). The difference between SwiftUI and UIKit is how iOS creates the…

How to develop accessible iOS apps — An important aspect of making your app accessible is to localize your app. Localization is the process of adapting a product or content to a specific locale or market. This includes translating, but also adapting graphics, content, and layout to suit the tastes and consumption habits of the target markets…

As many of you might know UITextField has a delegate protocol to notify you if the text of the textfield changes. But the only method that does that is textField(_:shouldChangeCharactersIn:replacementString:). …

Almost in every project I need a view or a button that has rounded corners and sometimes even a bit of shadow at the same time. It can be a bit hard when you start to apply both to the same view. This is a base class you can use…