What is @selector() in swift?
Swift itself doesn’t use selectors — several design patterns that in Objective-C make use of selectors work differently in Swift. (For example, use optional chaining on protocol types or
as tests instead of
respondsToSelector:, and use closures wherever you can instead of
performSelector: for better type/memory safety.)
But there are still a number of important ObjC-based APIs that use selectors, including timers and the target/action pattern. Swift provides the
Selector type for working with these. (Swift automatically uses this in place of ObjC's