iOS UISearchBar改变搜索框的颜色

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//搜索框  

- (UISearchBar *)searchBar{  

    if (_searchBar == nil) {  

        _searchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(0, 27, KScreenWidth, 30)];  

        _searchBar.placeholder = @"请输入搜索内容";  

        _searchBar.backgroundImage = [[UIImage alloc] init];  

        _searchBar.delegate = self;  

        _searchBar.tintColor =  LHColor(196, 196, 196);  

        //取出textfield  

          

        UITextField *searchField=[_searchBar valueForKey:@"_searchField"];  

          

//        searchField.backgroundColor = [UIColor grayColor];  

//        searchField.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageWithContentsOfFile:@"ic_map_topbar_search"]];  

//        searchField.background = [UIImage imageNamed:@"ic_map_topbar_search"];  

        //改变searcher的textcolor  

        searchField.borderStyle = UITextBorderStyleNone;  

//        searchField.background = [UIImage imageNamed:@"ic_top"];  

        searchField.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.3];  

        searchField.layer.cornerRadius = 4.0;  

        searchField.leftViewMode=UITextFieldViewModeNever;  

        searchField.textColor=[UIColor whiteColor];  

        //改变placeholder的颜色  

          

        [searchField setValue:[UIColor whiteColor]forKeyPath:@"_placeholderLabel.textColor"];  

    }  

    return _searchBar;  

}