NavigationController initWithRootViewController使應用程序iOS8崩潰

Question

我試圖用以下代碼在UINavigationController呈現一個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];

但是我在添加注釋“ // ERROR HERE”的地方遇到了錯誤，這是我嘗試使用名為imagePicker的 UIImagePickerController的根視圖啟動導航控制器的行 。 我不知道我在做什么錯？ 有什么幫助嗎？

錯誤是：

由於未捕獲的異常“ NSInvalidArgumentException”而終止應用程序，原因：“不支持按下導航控制器”

Answer 1

UIImagePickerController派生自UINavigationController，這就是為什么您不能將其推送到另一個UINavigationController（或設置為根視圖控制器）的原因。

Answer 2

聽起來您正在嘗試將導航控制器推到另一個導航控制器上。 您應該改為執行以下操作：

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];