How to change search icon inside UISearchBar? - objective-c

Question

I am trying to change the search icon inside an UISearchBar in iOS7 and ok, I got it. But is this the best way?
[self.searchBar setImage:[UIImage imageNamed: #"searchIcon.png"]
forSearchBarIcon:UISearchBarIconSearch
state:UIControlStateNormal];
And the problem is that the image size is not great as the original, I would like to know the correct size to replace the image. I am using an image = 64x64 and an image#2x = 128x128, is it correctly? If so, why my search bar is like this:

Answer 1

You can achieve this by setting the leftView of the searchField
if let textFieldInsideSearchBar = self.searchBar.valueForKey("searchField") as? UITextField {
textFieldInsideSearchBar.leftView = imageView
}

Answer 2

to Replace the magnifying glass icon in an iPhone UISearchBar with a custom image use this code
#import <UIKit/UIKit.h>
#interface SearchBoxExperimentsViewController : UIViewController {
IBOutlet UISearchBar *searchBar;
}
#end
#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