The fastest way for testing Dynamic Type while developing, and to quickly see how your app's UI flows, is by using the "option + cmd + plus/minus" to increase/decrease the text size in your simulator.
Day 169
Bump text size fast in Simulator
3 Nov 2022
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You may also find interesting...
Ever wondered what the ideal width is for labels so the text is readable? Well, it depends. But readableContentGuide has you covered. You can configure the optimal width independently of Dynamic Type size or Size Classes. https://developer.apple.com/documentation/uikit/uiview/readablecontentguide
I wish the adjustsFontForContentSizeCategory was true by default. Instead, you need to configure it that way so elements adjust their font size as the content size category (dynamic type) changes when a preferred font is used for a given style.
For other UI elements that could also benefit from being scaled when using Dynamic Type, you can use UIFontMetrics's scaledValue(for:). Some good examples are progress bar components, which tend to be quite slim. https://developer.apple.com/documentation/uikit/uifontmetrics/scaledvalue(for:)
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