OBJECTIVE C summary

OBJECTIVE C summary

- Primitive

Basic C primitive type are available in objective C

char/bool/int/long int/float/double/

BOOL defines yes/true/1 and no/false/0

 

- Additional Class

NSInteger, NSUInteger, NSFloat, NSNumber

for 64bit and 32bit CPU, the size of long, int may different, objective has additional class for these problem

-Special

id: id is a pointer which points to a object derived from NSObject.îî

nil: nil == NULL in c. nil means a NSObject point to a null object/ nothing

Nil: null class

SEL: is type from selector, define a method name. 

NSString(@), BOOL (yes, no)

[OOP]

@interface: define the class, method declaration 

@implementation: detail the interface

uppercast/downcast

[Memery]

Stack

Heap

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