Very happy with my iPhone for street photography. So is Peter van der Steege:

https://www.fitbrand.nl/tag/straatfotografie/

Then my apps:

Camera+ – nice app and can enables raw images on my iPhone 8.

Snapseed for postprocessing.

Standards iPhone Camera app: quick swipe from start screen. I would like to replace the swipe function to my Camera+, but found no option so far. Can you reprogram the from screen functionality or is Apple keeping that closed to their own apps?