What is use of performSelector in iOS

Question

What is the role of performSelector?

Comparing:

[self btnClicked];

and

[self performSelector:@selector(btn         


        

Answer 1

PerformSelector basically allows you to decide what message to pass during runtime (late binding), as opposed to languages like plain C. If you know the name to a method in an objective C class, you can use

NSSelectorFromString()

To convert a string into a selector, and have your class call that selector using performSelector. In this way, you can choose different functions to call during runtime. You can even select which function to call using a config file.