The document compares C# and Objective-C, demonstrating how to define and call methods in Objective-C. It shows an example of inserting an object into an array at a specific index. It also discusses using nested messages to avoid temporary variables, defining and accessing properties, and differences between pointer syntax and namespaces for classes like NSxxx and CGxxxx in Objective-C versus C#.

1. C# => Objective C primer
Nov 2011

2. Demonstrate example for using
header file: method definition

4. Object type
Demonstrate example for using adhoc
object

5. Method & Messaging
C#
void InsertObject(object anObject, int index)

6. Method & Messaging
Objective-C vs C#
+ static (class method)
- (normal public instance method)

7. Calling a method
C#
myArray.InsertObject(anObject, 0);

8. Nested messages
To avoid declaring numerous local variables to store temporary
results, Objective-C lets you nest messages.
C# C#
myAppObject.theArray() myAppObject.objectToInsert()
return A return B
[A insertObject:B atIndex:0]
object method parameter parameter

9. Use accessor methods (Properties)
using dot

10. Properties
Declare – in .h file
Define – in .m file

11. Pointer: *

12. NSxxx, CGxxxx
NextStep CoreGraphics

13. cocos2D objects and methods

14. Actions