Default Protocol Method Implementation in Objective-C

gistfile1.m

// SomeProtocol.h
@protocol SomeProtocol <NSObject>

- (void) protocolMethod;

@end


// NSObject+SomeProtocolDefaultImplementation.h
@interface NSObject(SomeProtocolDefaultImplementation)

- (void) protocolMethod;

@end


// NSObject+SomeProtocolDefaultImplementation.m
@implementation NSObject(SomeProtocolDefaultImplementation)

- (void) protocolMethod
{
    if (![self conformsToProtocol:@protocol(SomeProtocol)])
    {
        @throw [NSException exceptionWithName:NSInternalInconsistencyException reason:[NSString stringWithFormat:@"You must conform to protocol SomeProtocol to access this method.", NSStringFromSelector(_cmd)] userInfo:nil];
    }
    
    // method implementation
}

thanks for this paul lol