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            隨筆 - 42  文章 - 3  trackbacks - 0
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            閱讀排行榜

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            All objects that inherit from NSObject know these three methods:
            isKindOfClass: returns whether an object is that kind of class (inheritance included)
            isMemberOfClass: returns whether an object is that kind of class (no inheritance)
            respondsToSelector: returns whether an object responds to a given method

            Class testing methods take a Class
            You get a Class by sending the class method class to a class :)
            if ([obj isKindOfClass:[NSString class]]) {
            NSString *s = [(NSString *)obj stringByAppendingString:@”xyzzy”];
            }

            Method testing methods take a selector (SEL)
            Special @selector() directive turns the name of a method into a selector
            if ([obj respondsToSelector:@selector(shoot)]) {
            [obj shoot];
            } else if ([obj respondsToSelector:@selector(shootAt:)]) {
            [obj shootAt:target];
            }
            SEL is the Objective-C “type” for a selector
            SEL shootSelector = @selector(shoot);
            SEL shootAtSelector = @selector(shootAt:);
            SEL moveToSelector = @selector(moveTo:withPenColor:);
            posted on 2012-06-04 19:43 鷹擊長空 閱讀(140) 評論(0)  編輯 收藏 引用
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