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Objective C 2.0 ¼òÃ÷½Ì³Ì (5) ÊôÐÔ(Property)


Objective C 2.0 ¼òÃ÷½Ì³Ì (5) ÊôÐÔ(Property)





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ÖÜÁù, 2009Äê 03ÔÂ 28ÈÕ 07:47
Objective C 2.0 ΪÎÒÃÇÌṩÁËproperty¡£Ëü´ó´ó¼ò»¯ÁËÎÒÃÇ´´½¨Êý¾Ý³ÉÔ±¶Áдº¯ÊýµÄ¹ý³Ì£¬¸üΪ¹Ø¼üµÄÊÇËüÌṩÁËÒ»ÖÖ¸üΪ¼ò½à£¬Ò×ÓÚÀí½âµÄ·½Ê½À´·ÃÎÊÊý¾Ý³ÉÔ±¡£
ÎÒÃÇÏÈÀ´¿´Ò»ÏÂÔÚObjective C 1.xÏÂÎÒÃÇÉùÃ÷BookÀàµÄÍ·Îļþ£º
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//
// Book.h
 
#import <Cocoa/Cocoa.h>
 
 
@interface Book : NSObject {
NSString *title;
NSNumber* numofpages;
}
 
- (id)initWithTitle:(NSString*) booktitle andNumofpages:(NSNumber*) num;
 
- (NSString*) title;
- (void) setTitle:(NSString*)newtitle;
 
- (NSNumber*) numofpages;
- (void) setNumofpages:(NSNumber*)newnumofpages;
 
- (NSString*) summary;
 
@end
ÔÚObjective C 2.0Ï£¬ÎÒÃÇ¿ÉÒÔͨ¹ýÉùÃ÷ÓëÊý¾Ý³ÉԱͬÃûµÄpropertyÀ´Ê¡È¥¶Áдº¯ÊýµÄÉùÃ÷¡£´úÂëÈçÏÂËùʾ£º
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//
// Book.h
 
#import <Cocoa/Cocoa.h>
 
 
@interface Book : NSObject {
NSString *title;
NSNumber* numofpages;
}
 
- (id)initWithTitle:(NSString*) booktitle andNumofpages:(NSNumber*) num;
 
@property (retain) NSString* title;
@property (retain) NSNumber* numofpages;
 
@property (readonly) NSString* summary;
 
@end
ÎÒÃÇΪÿһ¸öÊý¾Ý³ÉÔ±ÉùÃ÷ÁËÒ»¸öproperty¡£¼´Ê¹BookÀàÖÐûÓÐsummaryÕâ¸öÊý¾Ý³ÉÔ±£¬ÎÒÃÇͬÑù¿ÉÒÔÉùÃ÷Ò»¸öÃûΪsummaryµÄproperty¡£ÉùÃ÷propertyµÄÓ﷨Ϊ£º
@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¯ÊýΪԭ×Ó²Ù×÷¡£
ÏÂÃæÎÒÃÇÀ´¿´Ò»ÏÂÔÚObjective C 1.x ÏÂimplementationÎļþ£º
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