iOS 18 lets you replace Apple's camera app with Halide or Obscura on the lock screen: Here's how | TechCrunch
Briefly

With iOS 18, users can now replace the default camera app on the lock screen with third-party options like Halide or Obscura, enhancing customization.
To swap the default camera icon, users need to enter lock screen customization, delete the original icon, and select alternatives from a menu.
Once installed, tapping the new shortcut launches Obscura or Halide's capture screen, offering a seamless photography experience, albeit a tad slower than Apple's app.
Although accessing the photo library from third-party apps isn’t possible directly, users can still swipe to quickly access Apple's camera if needed.
Read at TechCrunch
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