[objective C] .m 裡面的 @interface

ref : http://stackoverflow.com/questions/3967187/difference-between-interface-definition-in-h-and-m-file#_=_


一般來說, 在 objective C 宣告和實作應該會分別存放在 .h 和 .m 檔中,
然後用 @interface ... @end 和 @implementation ...@end 標開來,

但是有時候 @interface 也會出現在 .m 中 , 像這樣

Person.h:

@interface Person
{
    NSString *_name;
}

@property(readwrite, copy) NSString *name;
-(NSString*)makeSmallTalkWith:(Person*)person;
@end

Person.m:

@interface Person () //Not specifying a name for the category makes compiler checks that these methods are implemented.

-(void)startThinkOfWhatToHaveForDinner;
@end


@implementation Person

@synthesize name = _name;

-(NSString*)makeSmallTalkWith:(Person*)person
{
    [self startThinkOfWhatToHaveForDinner];
    return @"How's your day?";
}


-(void)startThinkOfWhatToHaveForDinner
{

}

@end

文中的解釋是說. 在 .m 檔的 @interface 中的宣告叫做 "class extension"(類別延伸?), 自動會變成 private ,







more info : http://macdevelopertips.com/objective-c/objective-c-categories.html