Video Tutorial: Objective-C Memory Management (Manual)

Before ARC, memory management in Objective-C was manual. Even with ARC it’s still important to understand how it works. By Ray Wenderlich.

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Video Tutorial: Objective-C Memory Management (Manual)

1 min


Your challenge is to add a new “Closet” class to the demo project, using manual memory management, so that this code works:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    Person *ray = [[Person alloc] initWithName:@"Ray"];
    Person *vicki = [[Person alloc] initWithName:@"Vicki"];
    Closet *closet = [[Closet alloc] init];
    ray.sweater = closet.graySweaterSlot;
    closet.graySweaterSlot = nil;
    vicki.sweater = closet.blueSweaterSlot;
    closet.blueSweaterSlot = nil;

    closet.blueSweaterSlot = vicki.sweater;
    vicki.sweater = ray.sweater;
    ray.sweater = nil;

    [ray release];
    [vicki release];
    [closet release];
    return YES;

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  • Around 8:28, I said “you always have to call super dealloc first”. This is a bit confusing, because actually it’s best practice to put the call to [super dealloc] at the end of the method, as shown in the video. It would have been more clear if I had said “you always have to call super dealloc at the end of dealloc if you are not using ARC”.
  • Audio was cut off around the 15:00 mark – it should have said “when you call init, by convention, it returns an object with retain count of 1”.


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