Runloop for IOS

Runloop

The Runloop object of the main thread is automatically opened, and UIApplication turns on a dead loop (message loop)

Each thread has its own Runloop object

Runloop 1.> Input Source Inputs resource: (Asynchronous messages, processing other threads) processing other threads back to the main thread to do things

Performselector:onthread (communication between threads)

2.> Timer Source Timer Resource:(synchronous message--processing the main thread) handles the main thread UI refresh, event handling, timer (there is no UI refresh, scrolling on the timed resolution interface)

Runloop for IOS