By Stephen G. Kochan
Programming in Objective-C, 6th Edition
Updated for OS X 10.9 Mavericks, iOS 7, and Xcode 5
Programming in Objective-C is a concise, conscientiously written instructional at the fundamentals of Objective-C and object-oriented programming for Apples iOS and OS X structures.
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Extra info for Programming in Objective C 6th Edition
When you ask a class Instances and Methods or an instance to perform some action, you say that you are sending it a message; the recipient of that message is called the receiver. So another way to look at the general format described previously is as follows: [ receiver message ]; Let’s go back to the previous list and write everything in this new syntax. Before you do that, though, you need to get your new car. Go to the factory for that, like so: yourCar = [Car new]; get a new car You send a new message to the Car class (the receiver of the message) asking it to give you a new car.
Double) retrieveDoubleValue; A value is returned from a method using the Objective-C return statement, similar to the way in which we returned a value from main in previous program examples. If the method returns no value, you indicate that using the type void, as in the following: –(void) print; This declares an instance method called print that returns no value. In such a case, you do not need to execute a return statement at the end of your method. 2: –(void) setNumerator: (int) n; –(void) setDenominator: (int) d; These are both instance methods that return no value.
The first argument to the NSLog routine is always the character string to be displayed. However, along with the display of the character 23 24 Chapter 2 Programming in Objective-C string, you often want to have the value of certain program variables displayed as well. In this case, you want to have the value of the variable sum displayed after these characters are displayed: The sum of 50 and 25 is The percent character inside the first argument is a special character recognized by the NSLog function.