Let's discuss the feedback interaction. Feedback helps people to know what an app is doing, discover what they can do next, and understand the results of actions. It's quite an important interaction element. Let's discuss just a couple guidelines for it. You should unobtrusively integrate status and other types of feedback into your interface. Ideally, users can get important information without taking action or being interrupted.

Man for example, subtly display status information in the toolbar. This information doesn't compete with the primary content on screen, but can be checked at any time with a quick glance. They can be different ways your app provides feedback, not just in the toolbar. Also, the responsiveness and feedback are achieved by displaying progress bar then immediately this And the action result on the screen. You could also provide feedback just on top of everything else for example, there isn't actually a lot of information about feedback from Apple. So you can use whichever you element you find useful for it.

Make sure it makes sense. No, also, that feedback can be accompanied by sound. For example, in Facebook, when you post a photo, there is a sound confirmation together with a photo appearing in the feed. avoid unnecessary alerts. And alert is a powerful feedback mechanism but should be used only to deliver important and ideally actionable information. If people see too many alerts that don't contain essential information, they quickly learn to ignore future alerts.