This document provides an overview of Objective-C and compares its terminology and syntax to C#, Java, and C++. It discusses how Objective-C is a thin layer on top of C that adds object-oriented programming features like messaging. It also notes that Objective-C is dynamically typed and linked for flexibility. The document then compares class and method declaration syntax between Objective-C and C#, and discusses topics like properties, strings, comments, and interfaces/protocols in Objective-C.

1. Objective‐C
with respect to
C# and Java
C# and Java
Presented by
Presented by
Babul Mirdha

2. Babul Mirdha
Founder at
েসcা.Net (www.seccha.net)
Organizer at
Organizer at
Having more than 5 years of
working experiences with
g
p
iOS, Android, Windows
Phone, Web & Desktop
(.Net) app development, I
have worked with various
languages, technologies &
tools
in
different
environment.
iOS Developers Meetup
Senior Software Engineer at
LeadSoft Bangladesh Limited

3. Overview
• Objective‐C
Objective C
– A thin layer on top of C and a strict superset of C;
–Object‐Oriented Programming language
b
d
l
–follows ANSI C style coding
–that adds Smalltalk‐style messaging
that adds Smalltalk style messaging

4. Dynamic Language
Dynamic Language
• There is no formal written standard
– Relies mostly on libraries written by others
• Flexible almost everything is done at runtime
Flexible almost everything is done at runtime.
– Dynamic Binding
– Dynamic Typing
– Dynamic Linking
• This allows for greater flexibility
• Minimizes RAM and CPU usage

5. C++/C#/Java VS Objective‐C
Terminology Comparison
T
i l
C
i

6. Class Declaration
Class Declaration
.NET C#
Objective‐C
cass AClass : Object
{
int aValue;
void doNothing();
g()
String returnString();
}
@interface AClass : NSObject
{
int aValue;
}
‐ (void)doNothing();
+ (NSString)returnString();
@
@end

7. Method Declaration
• Two type of Method:
– Class Method
– Instance method
• A class method
– indicated by a plus (+) character.
– associated with the class type.
• An instance method
– indicated by a minus (‐) character
indicated by a minus (‐) character.
– associated with an instance object associated with the
class.

9. How to pass parameters to method.
How to pass parameters to method.

10. Valid Mathod
Valid Mathod

11. Properties

12. Strings

13. Immutable vs Mutable String
Immutable vs Mutable String

14. Interfaces and Protocols

16. Comments

17. Demo
Hello World!

18. Q & A

19. Thank You All