NavigationController initWithRootViewController 使应用程序崩溃 iOS8

Question

我正在尝试使用以下代码在 UINavigationController 中呈现 UIImagePickerController：

UIImagePickerController * imagePicker = [[UIImagePickerController alloc] init];
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePicker.delegate = self;
imagePicker.showsCameraControls = NO;
imagePicker.modalPresentationStyle = UIModalPresentationOverCurrentContext;
self.tabBarController.tabBar.hidden = YES;

NSLog(@"HERES THE self.peresntingviewcontorller:: %@", self.presentingViewController);

//[self presentViewController:imagePicker animated:YES completion:^{}];
UINavigationController *cameraNavigationController = [[UINavigationController alloc] initWithRootViewController:imagePicker];  //ERROR HERE
[self presentViewController:cameraNavigationController animated:YES completion:nil];

但是我在添加注释“//ERROR HERE”时遇到错误，这是我尝试启动导航控制器的行，该控制器的根视图名为 UIImagePickerController 图像选择器。我不知道我做错了什么？有帮助吗？

错误是：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Pushing a navigation controller is not supported'

Answer 1

听起来您正试图将一个导航控制器推到另一个导航控制器上。您应该改为执行以下操作：

UIImagePickerController * imagePicker = [[UIImagePickerController alloc] init];
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
imagePicker.delegate = self;
imagePicker.showsCameraControls = NO;
imagePicker.modalPresentationStyle = UIModalPresentationOverCurrentContext;
self.tabBarController.tabBar.hidden = YES;

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

Answer 2

UIImagePickerController 派生自 UINavigationController，这就是为什么您不能将其推送到另一个 UINavigationController（或设置为根视图控制器）的原因。