seniorObjective-C
How does iOS event handling flow work (touch system)?
Updated May 17, 2026
Short answer
Touch events flow from UIApplication → UIWindow → UIView hierarchy using responder chain.
Deep explanation
When a touch occurs, UIKit creates a UIEvent and sends it to UIApplication, which passes it to the correct UIWindow. The hit-testing system determines which UIView should receive the event, and then responder chain methods like touchesBegan: are triggered.
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