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Suppose I make a UIViewController a UIScrollViewDelegate.
Do I need to implement all methods for the delegate, or can I just implement the 1 I care about?
If you
cmd + clickin xcode where you have declared that you implement the protocolXcode will take you to the header file where the protocol is defined. Here you can see that all of the methods for
UIScrollViewDelegateare declared as@optionaltherefore you can just implement the ones you want.If you prefer the documentation then
Applemarks the required methods withrequired methodin theTaskssection.Additionally the compiler will show warnings if you say you conform to a protocol but do not implement required methods.