flushCache
Removes all objects from the cache.
The SDK has a built-in FIFO persistent cache that caches all possible advertising resources, such as banners on the device. Each renderer, even custom ones, can cache advertising images and other resources. The ad cache stores files locally to improve the performance of ads.
You can use this method to completely clear the cache. This can be useful, for example, when a user has logged out of your app or changed account.
Note: Please note that your AdService must be successfully configured before calling this method. Otherwise, you will receive an AdError.Configuration error.
Return
The result of the cache clearing.