You also hit speed bumps you don’t really think of when you start out. Indeed, it’s one of my top crashers as of iOS 15, and I assume it’s because I use this old method of talking to every single view to update, and iOS uses a more efficient method under the hood. The result of this is that iOS rapidly asks your app to change its theme twice in a row (to the opposite theme, and then back to the normal), if you don’t do this quickly, you’re in trouble.
TWEETBOT 3 DARK MODE UPDATE
Because iOS is smart, when an app goes into the background, iOS quickly takes a screenshot of the app to show up in the app switcher, but it also quickly toggles the app to the opposite theme (so dark mode if the system is in light mode) and takes a screenshot of that as well, so if the system theme changes iOS can instantly update the screenshot in the app switcher. There’s other aspects to consider as well. Rather than just setting view.textColor = appTextColor in a single call and have it automatically switch between light and dark mode colors that you defined as needed, you have to set the color, register the view, have a separate theming function, and then go back and talk to that view whenever anything changes. So this works but has a lot of downsides.
TWEETBOT 3 DARK MODE CODE
The code defining, say, a custom blue accent/tint color for your app looks basically like: Heck, Apple even defines a bunch of built in ones, like “label” and “secondaryLabel”, so you likely don’t even have to define your own colors.
You set that on whatever you’re theming, and bam, iOS handles the rest, automatically switching when the iOS system theme changes. Each “color” basically has two colors: a light mode version and a dark mode version, and instead of calling it “whiteColor”, the color might be called “backgroundColor”, and have a lightish color for light mode and a darker color for dark mode. The current system is great for switching between light mode and dark mode. With iOS 12 Apple made that a lot nicer, and made switching between a light color scheme and a dark color scheme really easy. Dark mode didn’t exist at the iOS level, so it was up to apps to have two sets of colors to swap between individually. When you use the heck out of an app, it’s pretty nice to be able to tweak it in a way that suits you more.įor the longest time, by default, an app had one color scheme. It’s one of the core features of the new “Twitter Blue” subscription, Tweetbot and Twitterific have had it for awhile, my app Apollo has it (and a significant subset of users use it), and it’s basic table stakes in text editors. Theming apps (the ability to change up the color scheme for an app from say, a white background with blue links to a light green background with green links) is a pretty common feature across a lot of apps. Theming Apps on iOS is Hard February 7, 2022
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