I second bgmadclown,
Ad is definitely loaded, i have a game which i have tested in both android and ios, which has exact same code base.
and it works as expected in android, the checkloaded returns true as expected.
Where as in ios though there is an ad loaded but it still returns false.
Please checkout the example posted by bgmadclown.
im really looking forward for the fix.
Infact i was earlier using vungle which was working fine, but moved to fuse since it was more tightly integrated and had lot of features and moreover fuse is parent company of corona (not anymore, i backed the wrong horse).