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Objective-C return self; If things go badly and the init method fails, you will return nil instead of the new object. super Often when you are overriding a method in a subclass, you want to do some special subclass stuff and then invoke the implementation of the method as it was defined in the superclass. To make this possible, there is a compiler directive in Objective-C called super: - (void)someMethod { [self doSomeSpecialStuff]; [super someMethod]; } How does super work? Usually when you send a message to an object, the search for a method of that name starts in the object’s class.

Objective-C a pointer to it in the variable arrayInstance. When you have a pointer to an instance, you can send messages to it. The first message you always send to a newly allocated instance is an initialization message. [arrayInstance init]; Although sending the alloc message to a class creates an instance, the object isn’t valid until it has been initialized. Since an object must be allocated and initialized before it can be used, we always combine these two messages in one line. ” Both alloc and init return a pointer to the newly created object so that you have a reference to it.

2. Anatomy of a message Each argument has a label, and each label ends with a colon. One thing that confuses Objective-C beginners is that the name of the message is all of the labels in a selector. For example, addObject: has one label (addObject:) for its one argument. The message replaceObjectsInRange:withObjectsFromArray:r ange: has three arguments, so it has three labels. replaceObjectsInRangeWithObjectsFromArrayRange(aRange, anotherArray, anotherRange); In these languages, it isn’t completely obvious what each of the arguments sent to this function are.

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