????????iOS?????????λ???????????????????????“??·”??????????????Щ????????????Objective-C??????????????????????????????????????????????????????
????1. Object??c??????????????????????????????Category????????д?????????ü?к??????????????
????Object-c????????????У???????????????????????????????C++??????У?Category????????????÷???????Category???д?????????????Category??Ч???????????????????????????
????2.#import ??#include ????????@class??? ??import<> ?? #import”"????????
????#import ??Objective-C???????????????#include??C/C++??????????????????#import????????????????Σ?????????? ??????#include??#pragma once??@class?????????????????????????????????????????????????????????????????#import<>????????? ?????????#import””?????????????????
????3. ????readwrite??readonly??assign??retain??copy??nonatomic ?????????????????????????
????readwrite ??????д????????????getter??????setter?????
????readonly ?????????  ???????getter???? ????????setter???? ;?????????????????
????assign ?????????setter???????????????????????????????????????
????retain ????????????setter??????????????????????????????????retaincount??+1;
????copy ???????????setter?????????????????????????????μ???????
????nonatomic ?????????????????????????setter getter?????????????atomic??????????????????nonatomic
????4.д???setter???????????@property ??nonatomic??retain??NSString *name??д???setter???????????@property??nonatomic??copy??NSString *name
- (void) setName:(NSString*) str    {
[str retain];
[name release];
name = str;
}
- (void)setName:(NSString *)str
{
id t = [str copy];
[name release];
name = t;
}
????5.???????NSString*obj = [[NSData alloc] init]; obj???????????????????????????
???????????NSString??????????????NSData????????
????6.??????object-c??????????????Щ?? ??C??????????????????????磺NSInteger??int
????object-c????????????NSString??NSNumber??NSArray??NSMutableArray??NSData??????Щ????class????????????????C????????????????int????????????????????????????NSInteger????????????????????NSNumber??????????????NSObject??????NSInteger?????????????Int????Long???????NSInteger?????typedef long NSInteger?????????????????NSInteger?????????32λ????64λ?????????????int????Long??
????7.id ??????????????????
????Id ??????????????????????????????????????????objcetive-c?????
????8.Objective-C??ζ??????????????????????????
????Objective-C???????????????????ARC???????????????????????????????