iOS
9
An example is shown below.
-(void)calculateAreaForRectangleWithLength:(CGfloat)length
andBreadth:(CGfloat)breadth;
You might be wondering what the andBreadth string is for; actually it’s an
optional string, which helps us read and understand the method easily,
especially at the time of calling. To call this method in the same class, we use
the following statement:
[self calculateAreaForRectangleWithLength:30 andBreadth:20];
As said above, the use of andBreadth helps us understand that breadth is 20.
Self is used to specify that it's a class method.
Class Methods
Class methods can be accessed directly without creating objects for the class.
They don't have any variables and objects associated with it. An example is
shown below.
+(void)simpleClassMethod;
It can be accessed by using the class name (let's assume the class name as
MyClass) as follows:
[MyClass simpleClassMethod];
Instance Methods
Instance methods can be accessed only after creating an object for the class.
Memory is allocated to the instance variables. An example instance method is
shown below.
-(void)simpleInstanceMethod;
It can be accessed after creating an object for the class as follows:
MyClass *objectName = [[MyClass alloc]init] ;
[objectName simpleInstanceMethod];
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