在类继承体系中查询类型信息

在类继承体系中查询类型信息
isMemberOfClass 能够判断出对象是否为某个特定类的实例
isKindOfClass 判定出对象是否为某类或其子类的实例

例子：

NSMutableDictionary *dict = [[NSMutableDictionary alloc]init]；
BOOL memberDictBool =  [dict isMemberOfClass:[NSDictionary class]];//NSLog :NO
BOOL memberMutDictBool  =  [dict isMemberOfClass:[NSMutableDictionary class]];

// 理论上是YES，在Xcode8.1打印是NO

BOOL  kindDictBool =  [dict isKindOfClass:[NSDictionary class]];//NSLog :YES
BOOL  kindMutDictBool = [dict isKindOfClass:[NSMutableDictionary class]];//NSLog :YES

BOOL kindArrayBool = [dict isKindOfClass:[NSArray class]];//NSLog :NO

DLog(@"MemberNSDictionary:%d---MemberNSMutableDictionary:%d---kindNSDictionary:%d---kindNSMutableDictionary:%d---kindNSArray:%d",memberDictBool,memberMutDictBool,kindDictBool,kindMutDictBool,kindArrayBool);