设置 UISearchBar 输入字体颜色 和 默认字体颜色

UISearchBar *searchBar = [[UISearchBaralloc] initWithFrame:CGRectMake(0,0, 210, 44)];

 // Get the instance of the UITextField of the search bar

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

   // Change search bar text color

    searchField.textColor = [UIColorblackColor];

   // Change the search bar placeholder text color

    [searchFieldsetValue:[UIColorblackColor]forKeyPath:@"_placeholderLabel.textColor"];