Delegate and IBAction

Question

They seem to do the same thing in Objective C. What can you do without the other?

Answer 1

For instance:

• Delegate methods can have return values.
• There can be several purposes for the same action, but usually only one delegate.
• The mechanism of the target action (semantically, but not strictly) is associated with predetermined control events, such as “change in value”, “touch”, etc. Delegation methods can be any.
• Delegate methods can have arbitrary arguments. Action methods always have the same arguments (sender and event, both optional).