isKindOfClass和isMemberOfClass之间的区别

转载于：http://blog.youkuaiyun.com/onlyou930/article/details/7306148

1，

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.

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

isKindOfClass和isMemberOfClass之间的区别是：

我们可以使用isKindOfClass来确定一个对象是否是一个类的实例，或者是该类祖先类的实例。
isMemberOfClass只能用来判断前者，不能用来判断后者。

可以说：isMemberOfClass不能检测任何的类都是基于NSObject类这一事实，而isKindOfClass可以。

以下为自己总结：

[Kitty class] ---用来获取对象的类

@interface SonKitty : Kitty

@property (nonatomic, assign) int age;

@end

...

//子类的对象调用子类方法的实现

    SonKitty *son = [[SonKitty alloc] init];

    [son print];

    

    UIView *v = [[UIView alloc] init];

    NSLog(@"%@", v);

...

//isKindOfClass匹配子类和父类的对象

//isMemberOfClass严格匹配类型

    if (![v isKindOfClass:[Kitty class]]) {

        NSLog(@"v is not a kind of Kitty");

    }

    else {

        NSLog(@"v is a kind of Kitty");

    }

    

    if (![v isMemberOfClass:[Kitty class]]) {

        NSLog(@"v is not a member of Kitty");

    }

    else {

        NSLog(@"v is a member of Kitty");

    }

    

    if (![son isKindOfClass:[Kitty class]]) {

        NSLog(@"son is not a kind of Kitty");

    }

    else {

        NSLog(@"son is a kind of Kitty");

    }

    

    if (![son isMemberOfClass:[Kitty class]]) {

        NSLog(@"son is not a member of Kitty");

    }

    else {

        NSLog(@"son is a member of Kitty");

    }

输出结果：

2014-08-04 22:22:28.929 NSObjectApp2[35028:1575681] v is not a kind of Kitty

2014-08-04 22:22:28.930 NSObjectApp2[35028:1575681] v is not a member of Kitty

2014-08-04 22:22:28.930 NSObjectApp2[35028:1575681] son is a kind of Kitty

2014-08-04 22:22:28.931 NSObjectApp2[35028:1575681] son is not a member of Kitty

2，

//本质上，用%@打印对象的时候，打印的是该对象调用description方法所返回的字符串

    NSLog(@"%@:%@", [son description], son);

2014-08-04 22:22:28.927 NSObjectApp2[35028:1575681] <SonKitty: 0xae0af60> 这里是SonKitty: 0!:<SonKitty: 0xae0af60> 这里是SonKitty: 0!

可以看出输出结果是一样的。