Objective C 2.0 ÊôÐÔ(Property)
ÔÌûÒ»£ºhttp://blog.csdn.net/dotphoenix/archive/2009/05/20/4203075.aspx
ÔÌù¶þ£ºhttp://www.cocoachina.com/bbs/read.php?tid-8008.html
@property (²ÎÊý) ÀàÐÍ Ãû×Ö;
ÕâÀïµÄ²ÎÊýÖ÷Òª·ÖΪÈýÀࣺ¶ÁдÊôÐÔ£¨readwrite/readonly£©£¬setterÓïÒ⣨assign/retain/copy£©ÒÔ¼°atomicity£¨nonatomic£©¡£
assign/retain/copy¾ö¶¨ÁËÒÔºÎÖÖ·½Ê½¶ÔÊý¾Ý³ÉÔ±¸³ÓèÐÂÖµ¡£ÎÒÃÇÔÚÉùÃ÷summary properyʱʹÓÃÁËreadonly£¬ËµÃ÷¿Í»§¶ËÖ»ÄܶԸÃproperty½øÐжÁÈ¡¡£atomicityµÄĬÈÏÖµÊÇatomic£¬¶ÁÈ¡º¯ÊýΪÔ×Ó²Ù×÷¡£
ÔÚobjective c 2.0Ï£¬ÓÉÓÚÎÒÃÇÉùÃ÷ÁËproperty£¬implementationÎļþ¿ÉÒÔ¸ü¸ÄÈçÏ£º
¿ÉÒÔ¿´µ½Êý¾Ý³ÉÔ±titleºÍnumofpagesµÄ¶Áдº¯ÊýÒѾ²»¸´´æÔÚ£¬È¡¶ø´úÖ®µÄÊÇÁ½ÐÐ@synthesize£¬
¼ûÏÂÁÐʾÀý´úÂ룺
//test.h
@interface MyTest : NSObject {
int myArray[5];
}
@end
Èç¹û²ÉÓÃ
@property int myArray[5];
¿Ï¶¨»á³ö´í¡£
ÒòΪ@propertyµÄÉùÃ÷ָʾ±àÒëÆ÷ĬÈϵظømyArrayÌí¼ÓÁËmyArrayÒÔ¼°setMyArrayµÄÕâÑùÒ»¶ÔgetterºÍsetter·½·¨¡£ÓÉÓÚobjective-CÖз½·¨µÄ·µ»ØÀàÐͲ»ÄÜÊÇÊý×飬ËùÒÔÉÏÊöÉùÃ÷propertyµÄ·½Ê½ÊÇͨ²»¹ý±àÒëµÄ¡£
ÕýÈ·µÄ·½Ê½ÊÇ£º
//test.h
@interface MyTest : NSObject {
int myArray[5];
}
- (void)outPutValues;
@property int* myArray;
@end
¼´£¬Ê¹ÓÃÖ¸ÕëÀ´±íʾ·µ»ØÀàÐͲ¢×÷Ϊ²ÎÊýÉèÖÃÀàÐÍ¡£
²»¹ýÕâÑùÒ»À´¾ÍÎÞ·¨ÔÚ.mÎļþµÄʵÏÖÖÐʹÓÃ@synthesize£¬¶øÊÇÐèÒªÏÔʽµØÊµÏÖÕâ¶Ô·½·¨£º
#import <Foundation/Foundation.h>
#import "test.h"
#include <stdio.h>
@implementation MyTest
- (int*)myArray
{
return myArray;
}
- (void)setMyArray:(int*)anArray
{
if(anArray != NULL)
{
for(int i=0; i<5; i++)
myArray[i] = anArray[i];
}
}
ÕâÑùÒ»À´¶ÔÓÚÊý×éÐͱäÁ¿³ÉÔ±¾ÍÎÞ·¨Ê¹Óõ㣨.£©²Ù×÷·ûÀ´³éÏóµô¶ÔsetterºÍgetterµÄµ÷Óã¨Ê¹Óõã²Ù×÷·û·ÃÎʶÔÏóµÄ³ÉÔ±Êý¾Ý·Ç³£·½±ã£¬
¸ù¾ÝË÷Òª·ÃÎʵÄÊý¾Ý³ÉÔ±´¦ÓÚ×óÖµ»¹ÊÇÓÒÖµ¶øÓɱàÒëÆ÷×Ô¶¯Åж¨µ÷ÓÃsetter»¹ÊÇgetter£©¡£
Ïà¹ØÎĵµ£º
int arr[]={6,7,8,9,10};
int *ptr=arr;
*(ptr++)+=123;
printf("%d,%d",*ptr,*(++ptr));
´ËÌâ×îºóµÄ½á¹ûÊÇ8£¬8.
Õ§¿´½á¹ûÓ¦¸ÃÊÇ7ºÍ8¡£
ÔÀí£º
ÒòΪËüÃÇ×÷ΪprintfµÄ²ÎÊý£¬º¯Êýprintf´Ó×óÍùÓÒ¶ÁÈ¡£¬È»ºó½«ÏȶÁÈ¡·Åµ½Õ»µ×£¬×îºó¶ÁÈ¡µÄ·ÅÔÚÕ»¶¥£¬´¦ÀíʱºòÊÇ´ÓÕ»¶¥¿ªÊ¼µÄ£¬ËùÓÐÎÒÃÇ¿´¼ûµÄ½á¹ûÊÇ£¬´ÓÓұ߿ªÊ¼´¦ÀíµÄ¡£ ......
ÄÚÈÝÕªÒª£º±¾ÎÄÏêϸϵͳµØ½éÉÜÁËuC/OS-IIÔÚ51µ¥Æ¬»úÉϵÄÒÆÖ²¡¢ÖØÈëʵÏÖ·½·¨¡¢Ó²¼þ·ÂÕæ¡¢¹Ì»¯¡¢ÈË»ú½çÃæµÈ¹Ø¼üÄÚÈÝ¡£
¹Ø¼ü´Ê£ºÇ¶Èëʽʵʱ¶àÈÎÎñ²Ù×÷ϵͳ¡¢uC/OS-II¡¢C51
ÒýÑÔ£º
Ëæ×Ÿ÷ÖÖÓ¦Óõç×ÓϵͳµÄ¸´ÔÓ»¯ºÍϵͳʵʱÐÔÐèÇóµÄÌá¸ß£¬²¢°éËæÓ¦ÓÃÈí¼þ³¯×Åϵͳ»¯·½Ïò·¢Õ¹µÄ¼ÓËÙ£¬ÔÚ16λ/32λµ¥Æ¬»úÖÐ¹ã·ºÊ¹Ó ......
±¾ÎĽéÉÜÔÚGNU/Linux»·¾³ÏÂÒ»¸öC³ÌÐòÓÉÔ´´úÂëµ½³ÌÐò£¬µ½¼ÓÔØÔËÐУ¬×îºóÖÕÖ¹µÄ¹ý³Ì¡£Í¬Ê±ÒԴ˹ý³ÌÎªÔØÌ壬½éÉÜGNU/Linuxƽ̨ÏÂÈí¼þ¿ª·¢¹¤¾ßµÄʹÓá£
±¾ÎÄÒÔÎÒÃÇ×î³£¼ûµÄhello, world!ΪÀý£º
#include <stdio.h>
main ()
{
printf(“hello, world!\n” ......
ÏÂÃæÕâ¶Î´úÂëÓÐɶ´íÎó£¿
#if ULONG_MAX == 0xFFFFFFFF
inline unsigned long byte_swap(unsigned long x) { return __builtin_bswap32(x); }
inline long byte_swap(long x) { return __builtin_bswap32(x); }
#else
inline unsigned long byte_swap(unsigned long x) { return __builtin_bswap64(x); }
inline long ......