iphone - How to flush memory during low memory warning level 1 or 2 or 3 in ios -

My app consumes around 70 MB of memory so I need to flush it when I have low memory warning Level 1 or 2 is. Administrator, this function will attack when you have low memory warning:

- (zero) did Risive Memorianising {// Vision to see if there is no supervisor in it [Super Dareceywamari Warning]; // Use any cached data, pictures, etc. which are not in use. }