iOS - Simulate on-device memory warnings using volume button press

gistfile1.m

#if DEBUG
#import <MediaPlayer/MediaPlayer.h>
#endif


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

#if DEBUG
    
    // Debug code that lets us simulate memory warnings by pressing the device's volume buttons.
    // Don't ever ship this code, as it will be rejected by Apple.
    
    MPVolumeView *volume = [[MPVolumeView alloc] initWithFrame:CGRectZero];
    [self.window addSubview:volume];
    
    // Register to receive the button-press notifications
    
    __block id volumeObserver;
    
    volumeObserver = [[NSNotificationCenter defaultCenter] addObserverForName:@"AVSystemController_SystemVolumeDidChangeNotification" object:nil queue:nil usingBlock:^(NSNotification *note) {
        NSLog(@"Manually simulating a memory warning.");
        [[UIApplication sharedApplication] performSelector:@selector(_performMemoryWarning)];
    }];
    
#endif

}