Creating an abstract class in Objective-C

Question

I\'m originally a Java programmer who now works with Objective-C. I\'d like to create an abstract class, but that doesn\'t appear to be possible in Objective-C. Is this poss

Answer 1

In fact, Objective-C doesn't have abstract classes, but you can use Protocols to achieve the same effect. Here is the sample:

CustomProtocol.h

#import 

@protocol CustomProtocol 
@required
- (void)methodA;
@optional
- (void)methodB;
@end

TestProtocol.h

#import 
#import "CustomProtocol.h"

@interface TestProtocol : NSObject 

@end

TestProtocol.m

#import "TestProtocol.h"

@implementation TestProtocol

- (void)methodA
{
  NSLog(@"methodA...");
}

- (void)methodB
{
  NSLog(@"methodB...");
}
@end