isMemberOfClass & isKindOfClass区别

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；（不过对NSMutableDictionary、NSString等并不适用）；
打印可以看出NSMutableDictionary的真身是__NSDictionaryM ；所以我们想要判断一个对象是否是NSMutableDictionary不能使用isMemberOfClass；不过自定义的类是可以使用isMemberOfClass来判断的。

    NSMutableDictionary *dict = [NSMutableDictionary new];    NSLog(@"%d",[dict isMemberOfClass:[NSDictionary class]]);    //0    BOOL ismember = [dict isMemberOfClass:[NSMutableDictionary class]];  //0    NSLog(@"--%d",ismember);    NSLog(@"%d",[dict isKindOfClass:[NSDictionary class]]);    //1    NSLog(@"%d",[dict isKindOfClass:[NSMutableDictionary class]]);    //1    NSLog(@"%d",[dict isKindOfClass:[NSArray class]]);    //    0    Person *person = [Person new];    NSLog(@"%d",[person isKindOfClass:[Person class]]);    //1    BOOL ismember1 = [person isMemberOfClass:[Person class]];    //1    NSLog(@"--%d",ismember1);

isKindOfClass：能够判断出对象是否为某类或者是其派生类的实例