Dot notation and using square bracket.

[android45]

I would like to know what is the difference between dot notation and using square bracket.

[ChrisPadgham]

Nothing really it is just a matter of personal taste, you can use either as you wish.

[geojia]

There are certain situiations where message call are perferred over dot notation.

When using custom getters (same for setters) [obj getPropertyA] is more usefull than obj.propertyA because the formor is searchable. While you can search for "propertyA", you would find both getters and setters.

[mptheapple11]

Convention for getters and setters in ObjC encourages getter method be called the variable name and the setter be called the variable name preceeded by set.

getter: [obj myVar] or obj.myVar
setter: [obj setMyVar:value] or obj.myVar = value

This kind of negates the example given above. Dot notation and bracket notation are interchangeable and are largely left to the developers style and personal preference.