你是想提醒自己必須去重寫某個方法，免得忘記？
我用的是在該方法里加宏

#define MustOverride() @throw [NSException exceptionWithName:NSInvalidArgumentException reason:[NSString stringWithFormat:@"%s must be overridden in a subclass/category", __PRETTY_FUNCTION__] userInfo:nil]

例如 [super init];

@interface ClassA : NSObject
- (void)method;
@end

@implementation ClassA

- (void)method{
    NSLog("ClassA method");
}
@end

@interface ClassB : ClassA

@end

@implementation ClassB
- (void)method{
    //[super methodA];  
    NSLog("ClassB method");
}
@end