Creating a simple class in Objective-C @techytube

Uploaded September 2012 | Updated September 2026, 2 weeks ago

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By Pavel@Techytube

Objective-C provides many pre-defined classes to us. But sometimes we
need our own classes.

Every class has 2 files: a "ClassName.h" file and "ClassName.m" file.
The first one is called the interface or the declaration file, and the
other one is named the implementation or the definition file. In the
.h file we declare what our class IS, and what it DOES, and in the .m
file we specify HOW the class does those specific functionality.

Classes can have member variables and public methods. Member variables
are declared inside the interface files between curly braces. The
public methods are declared in the interface file, after the closing
curly brace, and implemented in the implementation file.

Usually, for every member variable there are 2 methods: a getter and a setter.

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$Blocks in Objective-C Subscribe to our channel here for notifications on new video trainings. For more videos on technology, visit our website at http://www.techytube.com. By pavel@techytube, for more from this author visit: http://www.techytube.com/author/pavel Block objects provide a way for you to create an ad hoc function body as an expression in C, and C-derived languages such as Objective-C and C++. In other languages and environments, a block object is sometimes also called a closure. Here, they are typically referred as blocks, unless there is scope for confusion with the standard C term for a block of code. You use the ^ operator to declare a block variable and to indicate the beginning of a block literal. The body of the block itself is contained within {}, as shown in this example (as usual with C, ; indicates the end of the statement): int multiplier = 7; int (^myBlock)(int) = ^(int num) { return num * multiplier; }; Notice that the block is able to make use of variables from the same scope in which it was defined. If you declare a block as a variable, you can then use it just as you would a function: int multiplier = 5; int (^myBlock)(int) = ^(int num) { return num * multiplier; }; int result = myBlock(4); NSLog(@result = %d, result); // will output result = 20 You can find more about blocks on the following web page: http://developer.apple.com/library/ios/#documentation/cocoa/Conceptual/Blocks/Articles/00_Introduction.html$

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