Im trying to implement a tapjoy intertistial in swift language. Need an example

Im trying to implement a tapjoy intertistial in swift language... I know how to implement most of ad networks using objective-c but i could not find any tutorial in the internet. I would like just to use an intertistial ad in my swift game using tapjoy...does anyone have an simple example or tutorial to share on how to implement an intertistial ad using tapjoy? My code is simple, no cocos2d or any other framework. Thank you.