Objective C 2.0 ¼òÃ÷½Ì³Ì (5) ÊôÐÔ(Property)
Objective C 2.0 ¼òÃ÷½Ì³Ì (5) ÊôÐÔ(Property)
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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
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@property (²ÎÊý) ÀàÐÍ Ãû×Ö;
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assign/retain/copy¾ö¶¨ÁËÒÔºÎÖÖ·½Ê½¶ÔÊý¾Ý³ÉÔ±¸³ÓèÐÂÖµ¡£ÎÒÃÇÔÚÉùÃ÷summary properyʱʹÓÃÁËreadonly£¬ËµÃ÷¿Í»§¶ËÖ»ÄܶԸÃproperty½øÐжÁÈ¡¡£atomicityµÄĬÈÏÖµÊÇatomic£¬¶ÁÈ¡º¯ÊýΪÔ×Ó²Ù×÷¡£
ÏÂÃæÎÒÃÇÀ´¿´Ò»ÏÂÔÚObjective C 1.x ÏÂimplementationÎļþ£º
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