isKindOf,isMemberOf,isSubclassOf用法及区别

• isKindOfClass

Returns a Boolean value that indicates whether the receiver is an instance of given class or an instance of any class that inherits from that class.

// 调用该方法的对象是aClass或其子类的一个对象，则返回YES；否则返回NO；
- (BOOL)isKindOfClass:(Class)aClass;

• isMemberOfClass

Returns a Boolean value that indicates whether the receiver is an instance of a given class.

// 调用该方法的对象是参数类的一个对象，就返回YES，否则返回NO
- (BOOL)isMemberOfClass:(Class)aClass;

• isSubclassOfClass

Returns a Boolean value that indicates whether the receiving class is a subclass of, or identical to, a given class.

// 调用该方法的类是aClass的子类或与aClass相同，则为YES，否则为NO。
+ (BOOL)isSubclassOfClass:(Class)aClass;