How to write the method to execute after completion of two methods (ios)

Question

I have 2 methods to be executed on a button click event say method1: and method2: .Both have network calls and so cannot be sure which one will fin

Answer 1

Neat little method I got from Googles iOS Framework they rely on pretty heavily:

- (void)runSigninThenInvokeSelector:(SEL)signInDoneSel {


    if (signInDoneSel) {
        [self performSelector:signInDoneSel];
    }

}