What is the thing that rotates around with the app?

An allei that rotates around with the app...Is it used when specifying the date and time with a "calendar", or when you decide the time, minutes, and seconds with a "clock" timer?It is called, but there is no fixed name.However, here, it is unified with drum rolls due to the story.

Drum rolls are used in other smartphones/personal computers apps, not the monopoly for iOS apps.It is one of the UI (user interface) used when the user wants to choose something, and is used for apps running on the web browser.It can be called a general term.

The iOS app has many such "UIs that are often used but are not well known."In addition to the drum rolls, let me introduce some typical ones.

For example, a bar -shaped UI with a knob for adjusting the brightness and volume of the screen is called a "slider".The stick graph -shaped "Progress Bar" that stretches and contracts according to the progress of the work, and the "tab bar" area where the tab switching buttons at the bottom of the application are also familiar are also familiar.

Where it is not well known, there is a "segment control control" that summarizes buttons to switch views.It is the area just above the tab bar, which switches all photos by changing the year, month, daily, with photo apps."Page control", which is located directly above the dock on the home screen, and expresses the page position with ◯ and ●, seems to be a UI that is not known for its view.

The name of these UI parts is often mentioned in the work app development/design site.If you are interested, why not start developing apps?