Check if something responds to a certain selector, searching up until a certain class

gistfile1.txt

#import <UIKit/UIKit.h>
#import <objc/runtime.h>

@interface NSObject (MJGResponds)
+ (BOOL)mjg_hasImplementationForSelector:(SEL)selector searchUntilClass:(Class)cls;
@end

@implementation NSObject (MJGResponds)

+ (BOOL)mjg_hasImplementationForSelector:(SEL)selector searchUntilClass:(Class)cls {
  Class currentClass = self;
	
	BOOL found = NO;
	
	while (currentClass && currentClass != cls) {
		int unsigned numberOfMethods;
		Method *methods = class_copyMethodList(currentClass, &numberOfMethods);
		for (int i = 0; i < numberOfMethods; i++) {
			if (selector == method_getName(methods[i])) {
				found = YES;
				break;
			}
		}
		
		currentClass = class_getSuperclass(currentClass);
	}
	
	if (found) return YES;
	
	return NO;
}

@end


@interface MyView : UIView @end

@implementation MyView
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {}
@end

@interface MyView2 : MyView @end
@implementation MyView2 @end


int main(int argc, char *argv[]) {
	@autoreleasepool {
		BOOL has = [MyView2 mjg_hasImplementationForSelector:@selector(touchesBegan:withEvent:) searchUntilClass:[UIView class]];
		NSLog(@"has = %i", has);
	}
}