How to test Dynamic Type (larger font sizes) in iOS Simulator

Question

Changing Dynamic Type settings in iOS can be done manually (Settings > General > Accessibility > Larger Text).

But this does not appear to work in the current Simula

Answer 1

Although (to my knowledge) not documented, a launch argument can be used to define the initial Dynamic Type setting.

Key: UIPreferredContentSizeCategoryName

Value: One of the below

• UICTContentSizeCategoryXS
• UICTContentSizeCategoryS
• UICTContentSizeCategoryM
• UICTContentSizeCategoryL
• UICTContentSizeCategoryXL
• UICTContentSizeCategoryXXL
• UICTContentSizeCategoryXXXL
• UICTContentSizeCategoryAccessibilityM
• UICTContentSizeCategoryAccessibilityL
• UICTContentSizeCategoryAccessibilityXL
• UICTContentSizeCategoryAccessibilityXXL
• UICTContentSizeCategoryAccessibilityXXXL

Source of this undocumented key/values: GitHub.

A convenient way to do so is to add a launch argument to an Xcode scheme (add for example -UIPreferredContentSizeCategoryName UICTContentSizeCategoryXL under Arguments Passed On Launch), and this setting will apply when you run the app in Xcode. You can create multiple schemes with different Dynamic Type settings to switch between them.

If the purpose is creating screenshots using Fastlane Snapshot, the equivalent code is as follows:

app.launchArguments += [ "-UIPreferredContentSizeCategoryName", "UICTContentSizeCategoryXL" ]
app.launch()