Calling a method on the main thread?
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()}
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.
Here is a better way to do this in Swift:
runThisInMainThread { () -> Void in // Run your code self.doSomething()}func runThisInMainThread(block: dispatch_block_t) { dispatch_async(dispatch_get_main_queue(), block)}
Its included as a standard function in my repo, check it out: https://github.com/goktugyil/EZSwiftExtensions