调用系统的UIImagePickerController按钮颜色

为啥呢？？？

因为UIImagePickerController 本身继承 UINavigationController

NS_CLASS_AVAILABLE_IOS(2_0) __TVOS_PROHIBITED @interface UIImagePickerController : UINavigationController <NSCoding>

直接设置

    self.imagePickerController.navigationBar.tintColor = [UIColor whiteColor];

OK～