Objective-C에서의 메세지 포워딩 순서

Objective-C에서의 메세지 포워딩 순서

resolveInstanceMethod - nono
forwardingTargetForSelector - nono
methodSignatureForSelector - nono
forwardInvocation - nono
doesNotRecognizeSelector - nono

위의 순서로 호출이 되므로 필요한 곳에서 프록시등이 호출되도록 해야함.

@interface TextObject : NSObject

@end

@implementation TextObject

+ (BOOL)resolveInstanceMethod:(SEL)sel
{
    NSLog(@"resolveInstanceMethod - %@", NSStringFromSelector(sel));

    return [super resolveInstanceMethod:sel];
}

+ (BOOL)resolveClassMethod:(SEL)sel
{
    NSLog(@"resolveClassMethod - %@", NSStringFromSelector(sel));

    return [super resolveClassMethod:sel];
}

- (id)forwardingTargetForSelector:(SEL)sel
{
    NSLog(@"forwardingTargetForSelector - %@", NSStringFromSelector(sel));

    return [super forwardingTargetForSelector:sel];
}

- (NSMethodSignature *)methodSignatureForSelector:(SEL)sel
{
    NSLog(@"methodSignatureForSelector - %@", NSStringFromSelector(sel));

    NSString *types = @"@@:";
    return [NSMethodSignature signatureWithObjCTypes:[types UTF8String]];
}

-(void)forwardInvocation:(NSInvocation *)invocation;
{
    SEL sel = [invocation selector];
    NSLog(@"forwardInvocation - %@", NSStringFromSelector(sel));

    return [super forwardInvocation:invocation];
}

- (void)doesNotRecognizeSelector:(SEL)sel
{
    NSLog(@"doesNotRecognizeSelector - %@", NSStringFromSelector(sel));
    [super doesNotRecognizeSelector:sel];
}

@end


@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    TextObject *to = [TextObject new];

    [to performSelector:NSSelectorFromString(@"nono")];


    return YES;
}

@end