iPhoneアプリでdidReceiveMemoryWarningとかをテストした時のメモ。

Memory Warningを発生させる

シミュレータ

iOS Simulatorのメニューにて

Hardware -> Simulate Memory Warning

で再現できます。
ショートカットは[command]+[shift]+M。

実機

下記のprivate APIが使えます。

someFile.m

[[UIApplication sharedApplication] performSelector:@selector(_performMemoryWarning)];

Memory Warningをキャッチ

Memory Warningはそれぞれ

AppDelegate
ViewController
UIApplicationDidReceiveMemoryWarningNotification
でキャッチできます。

AppDelegate.m

- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application
{
    NSLog(@"applicationDidReceiveMemoryWarning");
}

ViewController.m

- (void)didReceiveMemoryWarning 
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
    NSLog(@"didReceiveMemoryWarning");
}

someFile.m

- (void)someFunction 
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleMemoryWarning:) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
}

- (void) handleMemoryWarning:(NSNotification *)notification
{
    NSLog(@"handleMemoryWarning");
}

以上