Add background color in header of mobile app?

I’ve been researching (and downloading) iPhone apps for UX inspiration.
Most retailer and productivity apps I’ve downloaded have a header area with some search textbox and a few filters.
I’ve noticed that some of these apps have a backgrou…
share this post : )
Showing that dropdown filter has been applied?

An issue I’ve had with mobile apps with dropdowns is that when I change the dropdown selection, it’s not clear if the filter was applied. It usually happens when my phone has weak reception. I continue clicking on dropdowns but nothing hap…
share this post : )
Proper UX to combine dropdown and segmented control?

Is it good UX to combine dropdown and segmented control?
Something like this:
share this post : )
Why use borders around dropdowns in a mobile app?

I’m working on a mobile app with a GUI similar to the Gasbuddy mobile app.
The first screenshot is what Gasbuddy looks like now. The 2nd screenshot is the same thing but without the borders around the dropdowns.
I may be overthinking, but …