Replace the magnifying glass icon in an iPhone UISearchBar with a custom image.

SearchBoxExperimentsViewController.h

#import <UIKit/UIKit.h>

@interface SearchBoxExperimentsViewController : UIViewController {
  IBOutlet UISearchBar *searchBar;
}

@end

SearchBoxExperimentsViewController.m

#import "SearchBoxExperimentsViewController.h"

@interface SearchBoxExperimentsViewController (Private)
- (void)setSearchIconToFavicon;
@end


@implementation SearchBoxExperimentsViewController

- (void)viewDidLoad {
  [self setSearchIconToFavicon];
  [super viewDidLoad];
}

#pragma mark Private

- (void)setSearchIconToFavicon {
  // Really a UISearchBarTextField, but the header is private.
  UITextField *searchField = nil;
  for (UIView *subview in searchBar.subviews) {
    if ([subview isKindOfClass:[UITextField class]]) {
      searchField = (UITextField *)subview;
      break;
    }
  }
  
  if (searchField) {  
    UIImage *image = [UIImage imageNamed: @"favicon.png"];
    UIImageView *iView = [[UIImageView alloc] initWithImage:image];
    searchField.leftView = iView;
    [iView release];
  }  
}

@end