我是Objective-C的新手，我有一个问题。我创建了一个自定义类并尝试为初始化创建重载:-(id)init{if(self=[superinit]){[selfsetIsCurrentCar:NO];}returnself;}-(id)initWithID:(NSInteger)id{if(self=[selfinit]){[selfsetID:id];}returnself;}-(id)initWithID:(NSInteger)idCarYear:(NSString*)year{if(self=[selfinitWithID:id]){[selfsetCarYear:year]