Question

My app consumes memory around 70 Mb. So i need to flush it out when i’ve low memory warning level 1 or 2.

Answer 1

In your controller this function will invokes once you have low memory warning:

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc. that aren't in use.
}