IOS 自定义UISearchBar的背景图

- (void)layoutSubviews {
UITextField *searchField;
NSUInteger numViews = [self.subviews count];
for(int i = 0; i < numViews; i++) {
if([[self.subviews objectAtIndex:i] isKindOfClass:[UITextField class]]) {
searchField = [self.subviews objectAtIndex:i];
}
}
if(!(searchField == nil)) {
searchField.textColor = [UIColor whiteColor];
[searchField.leftView setHidden:YES];
[searchField setBackground: [UIImage imageNamed:@"SearchBarBackground.png"] ];
[searchField setBorderStyle:UITextBorderStyleNone];
}

[super layoutSubviews];