If the interstitial is displaying now, then I don't need to show it again.
Inmobi has the function: if(inmobInterstitial.state==kIMInterstitialStateActive)
, how about admob and chartboost?
I have integrated admob,inmobi and chartboost in my app. If anyone is still loading or not ready, then I pop up anyone which is ready. When chartboost is displaying now, but the app don't know it, then pop up inmobi. It's the bug.