Although we see similar designs, there are obvious differences. Even applications with millions of users like WhatsApp have preferred to use system default instead of custom design. There may be many reasons for this. But this is a good way to keep WhatsApp’s user habit.
As I said at the beginning, the biggest design factor that will allow you to understand that the phone is an iPhone is views. This is all about visuals. There are many examples of this section. With these examples, you will see how bars and controls are also used in views.
One of the factors that make the user feel they are in control while using an application is action sheets. This view element makes the user feel that the application is safe. When the user needs to take any action, it appears on the screen and directs the user.
Likewise, the alert bar, which is a views element, is used to inform the user. Similarly, it gives the user confidence and makes them feel in control. If an action is required, the user can take action.
When you share an image, you also benefit from views. You also use the views element, activity views, when you quickly post a photo or share a web page from Safari.
When you open a photo, read an article in Books, check your mails, every example you use is part of the views.