ios - UIApplicationDelegate but for each ViewController -


i want notified whenever new view controller shown, uiapplicationdelegate provides such way whole app, not each view controllers

is there delegate being called every time new view controller appears?

note

i totally aware of functions inside uiviewcontroller, asking delegate separated view controller itself, applicationdelegate

my attempts

i searched lot, solution comes mind extend viewcontroller, , let view controllers inherit new view controller, prefer if there way catch events without changing in view controllers

there 

- (void)navigationcontroller:(uinavigationcontroller *)navigationcontroller didshowviewcontroller:(uiviewcontroller *)viewcontroller animated:(bool)animated;

method in uinavigationcontrollerdelegate.

swift version:

func navigationcontroller(_ navigationcontroller: uinavigationcontroller, didshow viewcontroller: uiviewcontroller, animated: bool)

you can set uiapplicationdelegate delegate of uinavigationcontroller , events there.


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