OBJECTIVE C Kurt Ladendorf

General Knowledge  Super set of C  Smalltalk  Mainly used for iOS and other Apple development

Data types  int, double, float, char, BOOL (YES, NO)  id  long, long long, short  Signed/unsigned  Nil

Control structures  If  Switch  For  Do while  Try catch finally

Methods  Method template:  -(void) setScore : (int) score andTime : (int) time;  Method call  [objectName setScore: 12 andTime: 47];

Arrays  Immutable  Derived from NSArray  Mutable  Derived from NSMutableArray

Array Example

Classes  Base classes normally are children of NSObject  Instance methods  Denoted by a -  Class methods  Denoted by a +

Inheritance  Single inheritance  Overriding a function  Use same function prototype and return type ChildClass : ParentClass

Instantiating Objects  Create a pointer and then call the object’s allocate and initialize methods  ClassName *foo = [[ClassName alloc] init];

Categories  Used to customize a class  Naming conflicts can arise!  Cannot add instance variables  Declaring a category ClassName (CategoryName)  Has section

Point.h Point.m

Links!  C_2.0_Essentials C_2.0_Essentials   