不管怎么操作就是 没有办法改变里面的白色区域

UISearchBar *searchBar = [[UISearchBaralloc] initWithFrame: CGRectMake(15.0f, 30.0f, 145.0f, 45.0f)];  

    searchBar.placeholder = @"Enter Name";

    searchBar.delegate = self;

    searchBar.showsCancelButton = NO;

searchBar.showsScopeBar = NO;

searchBar.barStyle = UIBarStyleBlackTranslucent;

searchBar.inputView.backgroundColor = [UIColorclearColor];

searchBar.alpha = 1.0f;

searchBar.backgroundColor = [UIColorclearColor];

for (UIView *subview in searchBar.subviews) 

{

if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground")])

{

[subview removeFromSuperview];  

break;

} 

}

[[[searchBar subviews] lastObject] setBackgroundColor:[UIColorcolorWithRed:0.118fgreen:0.118fblue:0.118falpha:1.0f]];

searchBar.keyboardType = UIKeyboardTypeDefault;

[self addSubview:searchBar];

self._searchBar = searchBar;

[searchBar release];