Enable search button on keyboard with empty value on UISearchBar
@implementation UISearchBar (UISearchBar_EnableEmptySearch)
- (void)enableEmptySearch {
	
	UITextField *searchBarTextField = nil;
	for (UIView *subView in self.subviews){
		for (UIView *secondLeveSubView in subView.subviews){
			if ([secondLeveSubView isKindOfClass:[UITextField class]])
			{
				searchBarTextField = (UITextField *)secondLeveSubView;
				break;
			}
		}
	}
	
	searchBarTextField.enablesReturnKeyAutomatically = NO;
}
#import <UIKit/UIKit.h>
@interface UISearchBar (UISearchBar_EnableEmptySearch)
- (void)enableEmptySearch;
@end