iOS dynamic type Iskindofclass, Ismemberofclass

The ability of an object to acquire its type at run time is called introspection. Introspection can be accomplished in a number of ways.

Judging object Types

-(BOOL) Iskindofclass:classobj to determine if this class or subclass of this class is an instance of

-(BOOL) ismemberofclass:classobj to determine if it is an instance of this class

Let's try the use of these two methods.

1. New Person class inherits NSObject, new teacher class inherits person
1.1. New Person class
1. #import <Foundation/Foundation.h>
2.
[email protected] Person:nsobject
6.9
5. NSString *name;
6.}
7.-(void) SetName: (nsstring*) n; 8.
[email protected]

 
1. #import "Person.h" &NBSP;&NBSP;&NBSP;
2.  
[email protected]  person  
4.-(void) SetName: (NSString *) n  5. {  
6.    name = n;  
7.}   
8.  
[email  Protected]  

1.2 New Teacher Class
1. #import "Person.h"
2.
[email protected] Teacher:person
4.
5.-(void) teach; 6.
[email protected]

1. #import "Teacher.h"
2.
[email protected] Teacher
4.-(void) Teach 5. {
6. NSLog (@ "I teach maths"); 9.3
[email protected]

1.3 We first experiment with the Ismemberofclass method.
1.NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
2. Person *person = [[Person alloc] init];
3. Teacher *teacher = [[Teacher alloc] init];
4.
5.//yes 6.        if ([Teacher Ismemberofclass:[teacher class]]) {7.  NSLog (@ "Member of teacher Teacher Class"); 8.}
9.//no 10.       if ([Teacher Ismemberofclass:[person class]]) {11.  NSLog (@ "Member of teacher Person class"); 12.}
//no 14.       if ([Teacher Ismemberofclass:[nsobject class]]) {15.  NSLog (@ "Member of Teacher NSObject class"); 16.}
[Person release];
[Teacher release];
[Pool release];

Printing results:

2012-07-04 14:23:07.965 objectivectest[2460:f803] Teacher Teacher class members

Only the first judgment is printed, and Ismemberofclass determines whether it belongs to an instance of this class, whether it is related to the parent class or not.

1.4 Ismemberofclass Method
1.NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
2.Person *person = [[Person alloc] init];
3.Teacher *teacher = [[Teacher alloc] init];
4.
5.//yes 6.if ([Teacher Iskindofclass:[teacher class]]) {7.  NSLog (@ "Teacher is a subclass of teacher class or teacher"); 8.}
9.//yes 10.if ([Teacher Iskindofclass:[person class]]) {11.  NSLog (@ "Teacher is a subclass of person class or person"); 12.}
13.//yes 14.if ([Teacher Iskindofclass:[nsobject class]]) {15.  NSLog (@ "Teacher is a subclass of NSObject class or nsobject"); 16.}
17.[person release];
18.[teacher release];
19.[pool release];

2012-07-04 14:34:17.315 objectivectest[2595:f803] teacher is a subclass of teacher class or teacher

2012-07-04 14:34:17.316 objectivectest[2595:f803] teacher is a subclass of the person class or person

2012-07-04 14:34:17.316 objectivectest[2595:f803] teacher is a subclass of NSObject class or NSObject

The three results are printed out.

iOS dynamic type Iskindofclass, Ismemberofclass