isKindOfClass和isMemberOfClass 的区别

判断对象类型

-(BOOL) isKindOfClass: classObj判断是否是这个类或者这个类的子类的实例

-(BOOL) isMemberOfClass: classObj 判断是否是这个类的实例

测试实例:

新建Person类继承NSObject,新建Teacher类继承Person

新建Person类:

#import <Foundation/Foundation.h>  

@interface Person : NSObject

{

    NSString *name;

}

-(void)setName:(NSString*)n;  

@end

#import "Person.h"  

@implementation Person

-(void)setName:(NSString *)n

{

    name = n;

}  

@end

新建Teacher类

#import "Person.h"  

@interface Teacher : Person  

-(void)teach;  

@end

#import "Teacher.h"  

@implementation Teacher

-(void)teach

{

    NSLog(@"我教数学");

}

@end

我们先试验isMemberOfClass方法:

Person *person = [[Person alloc] init];

   Teacher *teacher = [[Teacher alloc] init];  

   //YES

   if ([teacher isMemberOfClass:[Teacher class]]) {

        NSLog(@"teacher Teacher类的成员");

   }

   //NO

   if ([teacher isMemberOfClass:[Person class]]) {

       NSLog(@"teacher Person类的成员");

   }

   //NO

   if ([teacher isMemberOfClass:[NSObject class]]) {

       NSLog(@"teacher NSObject类的成员");

   }

打印结果:

-- ::07.965 ObjectiveCTest[:f803] teacher Teacher类的成员

只有第一个判断打印出来，isMemberOfClass判断是否是属于这类的实例，是否跟父类有关系他不管。

isKindOfClass方法

Person *person = [[Person alloc] init];

Teacher *teacher = [[Teacher alloc] init];  

//YES

if ([teacher isKindOfClass:[Teacher class]]) {

    NSLog(@"teacher 是 Teacher类或Teacher的子类");

}

//YES

if ([teacher isKindOfClass:[Person class]]) {

    NSLog(@"teacher 是 Person类或Person的子类");

}

//YES

if ([teacher isKindOfClass:[NSObject class]]) {

    NSLog(@"teacher 是 NSObject类或NSObject的子类");

}

打印结果:

2017-05-26 11:15:17.315 ObjectiveCTest[2595:f803] teacher 是 Teacher类或Teacher的子类

2017-05-26 11:15:17.316 ObjectiveCTest[2595:f803] teacher 是 Person类或Person的子类

2017-05-26 11:15:17.316 ObjectiveCTest[2595:f803] teacher 是 NSObject类或NSObject的子类

三个结果都打印出来了。

巴特西

isKindOfClass和isMemberOfClass 的区别

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