// 创建图片选择器

            UIImagePickerController *picker = [[UIImagePickerController alloc] init];

            picker.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;

            picker.allowsEditing = YES;

            picker.delegate = self;

//设置导航栏背景颜色

picker.navigationBar.barTintColor = HexRGB(0x4294FE);

//设置右侧取消按钮的字体颜色

picker.navigationBar.tintColor = [UIColor whiteColor]; // 以富文本方式更改[picker.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor], NSFontAttributeName:[UIFont boldSystemFontOfSize:18]}];

           [self presentViewController:picker animated:YES completion:nil];

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated

{

    [viewController.navigationItem.rightBarButtonItem setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor], NSFontAttributeName:[UIFont systemFontOfSize:]} forState:UIControlStateNormal];

    [viewController.navigationItem.leftBarButtonItem setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor], NSFontAttributeName:[UIFont systemFontOfSize:]} forState:UIControlStateNormal];

}