OBJECTIVE C summary
攀升发表于 2015-02-01 18:18:00
- 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