Can you tell me about the different modes of operation of RunLoop cycles and their purpose?

RunLoop in iOS is an event processing loop that manages event sources and timers. It operates in multiple modes, which determine which events are processed at any given time.

Main RunLoop modes:

• Default Mode (NSDefaultRunLoopMode) — the primary mode where RunLoop operates normally, processing standard events.
• UI Tracking Mode (UITrackingRunLoopMode) — used when the user interacts with the interface, such as scrolling a UIScrollView. In this mode, RunLoop handles tracking-related events to ensure smoothness.
• Common Modes (NSRunLoopCommonModes) — a set of modes that combines several modes (e.g., Default and UI Tracking), so that events registered in Common Modes are processed in multiple modes.

The purpose of modes is to isolate the processing of different types of events, so that, for example, during scrolling, other events that could slow down the interface are not processed.

Example: if you want a timer to work even during scrolling, you need to add it to Common Modes:

RunLoop.current.add(timer, forMode: .common)

Thus, RunLoop modes help manage priorities and types of events processed for optimal application performance.