isKindOfClass和isMemberOfClass 的區別

判斷對象類型

-(BOOL) isKindOfClass: classObj判斷是否是這個類或者這個類的子類的實例

-(BOOL) isMemberOfClass: classObj 判斷是否是這個類的實例

測試實例:

新建Person類繼承NSObject,新建Teacher類繼承Person

 新建Person類:

#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類

#import "Person.h"  
  
@interface Teacher : Person  
  
-(void)teach;  
  
@end 

#import "Teacher.h"  
  
@implementation Teacher  
-(void)teach  
{  
    NSLog(@"我教數學");  
}  
@end

我們先試驗isMemberOfClass方法:

Person *person = [[Person alloc] init];  
   Teacher *teacher = [[Teacher alloc] init];  
     
   //YES  
   if ([teacher isMemberOfClass:[Teacher class]]) {  
        NSLog(@"teacher Teacher類的成員");  
   }  
   //NO  
   if ([teacher isMemberOfClass:[Person class]]) {  
       NSLog(@"teacher Person類的成員");  
   }  
   //NO  
   if ([teacher isMemberOfClass:[NSObject class]]) {  
       NSLog(@"teacher NSObject類的成員");  
   }  

打印結果:

2017-05-26 11:13:07.965 ObjectiveCTest[2460:f803] teacher Teacher類的成員

只有第一個判斷打印出來，isMemberOfClass判斷是否是屬於這類的實例，是否跟父類有關系他不管。

 

isKindOfClass方法

Person *person = [[Person alloc] init];  
Teacher *teacher = [[Teacher alloc] init];  
  
//YES  
if ([teacher isKindOfClass:[Teacher class]]) {  
    NSLog(@"teacher 是 Teacher類或Teacher的子類");  
}  
//YES  
if ([teacher isKindOfClass:[Person class]]) {  
    NSLog(@"teacher 是 Person類或Person的子類");  
}  
//YES  
if ([teacher isKindOfClass:[NSObject class]]) {  
    NSLog(@"teacher 是 NSObject類或NSObject的子類");  
}  

打印結果:

2017-05-26 11:15:17.315 ObjectiveCTest[2595:f803] teacher 是 Teacher類或Teacher的子類
2017-05-26 11:15:17.316 ObjectiveCTest[2595:f803] teacher 是 Person類或Person的子類
2017-05-26 11:15:17.316 ObjectiveCTest[2595:f803] teacher 是 NSObject類或NSObject的子類
三個結果都打印出來了。