ios - UIImagePickerController : is it possible to set overlay view only in editing mode after capture?

Question

我将 AllowEditing 设置为 true，并且在捕获图像后，我想在编辑屏幕中提供额外的说明以裁剪图像的一部分。那可能吗？

Answer 1

UIImagePickerViewController实际上是 UINavigationController .这使您能够跟踪您在 UINavigationViewController 中的哪个步骤，因此您只能在到达第二个 View Controller 时设置覆盖 View 。

简单来说:
- UIImagePickerController.delegate = self
- 使自己符合 UINavigationControllerDelegate 协议(protocol)
- 实现下一个方法:

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if ([navigationController.viewControllers indexOfObject:viewController] == 1)
    {
        // If second UIViewController, set your overlay.
    }
}