Calling a method on the main thread?

Question

First of all I am writing code for iphone. I need to be able to call a method on the main thread without using performSelectorOnMainThread. The reason that I don't want to use performSelectorOnMainThread is that it causes problem when I am trying to create a mock for unit testing.

[self performSelectorOnMainThread:@Selector(doSomething) withObject:nil]; 

The problem is that my mock knows how to call doSomething but it doesn't know how to call performSelectorOnMainThread.

So Any solution?

Answer 1

Objective-C

dispatch_async(dispatch_get_main_queue(), ^{     [self doSomething]; }); 

Swift

DispatchQueue.main.async {     self.doSomething() } 

Legacy Swift

dispatch_async(dispatch_get_main_queue()) {     self.doSomething() } 

Answer 2

There's a saying in software that adding a layer of indirection will fix almost anything.

Have the doSomething method be an indirection shell that only does a performSelectorOnMainThread to call the really_doSomething method to do the actual Something work. Or, if you don't want to change your doSomething method, have the mock test unit call a doSomething_redirect_shell method to do something similar.