为什么不能将UIImagePickerController推入导航堆栈? [英] Why can’t UIImagePickerController be pushed into navigation stack?

问题描述

使用pushViewController推动UIImagePickerController时:

[self.navigationController pushViewController:pvc animated:YES];

将发生错误，例如:

不支持按导航控制器

Pushing a navigation controller is not supported

正确的解决方案是使用presentModalViewController:

The right solution is to use presentModalViewController:

[self presentModalViewController:pvc animated:YES];

有人可以解释为什么这是必要的吗? UIViewController中隐藏了什么?

Can someone explain why this is necessary? What‘s hidden in UIViewController?

谢谢！

推荐答案

Apple不允许堆叠导航栏.由于图像选择器具有自己的导航栏，因此无法将其放置在导航堆栈中.由于会有两个栏，两组导航项，两个标题等，因此结果会引起用户混乱.

Apple does not allow stacking of navigation bars. Since the image picker has its own navigation bar, it cannot be placed in a navigation stack. The result would cause user confusion since there would be two bars, two sets of navigation items, two titles, etc.

这篇关于为什么不能将UIImagePickerController推入导航堆栈?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！