Instance Methods and Class Methods in Objective-C @techytube

Uploaded September 2012 | Updated September 2026, 2 weeks ago

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Instance Methods and Class Methods in Objective-C is very similar to the same concepts implemented in other object oriented programming languages.

Instance methods are the usual methods, and we always need some object(s) to call those specific methods. When we declare and implement them, we always start with the "-" (minus sign). The syntax for calling an instance method is:

[objectName instanceMethodName];

For class methods we do not need any object created in our program in order to call them.
They always start with the "+" (plus sign). The syntax for calling a class method is:

[ClassName classMethodName];

Instance Methods and Class Methods in Objective-C

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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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