呈现 ImagePickerView 导致崩溃答案

【问题标题】：Present ImagePickerView causing crash呈现 ImagePickerView 导致崩溃
【发布时间】：2016-10-08 03:00:11
【问题描述】：

这是我的代码，一个简单的类，在故事板中创建了一个视图，其中包含一个用于呈现 imagePickerView 的按钮。 imagePickerView 被呈现，然后应用程序崩溃并显示libc++abi.dylib: terminating with uncaught exception of type NSException

import Foundation
import UIKit


class ImageSelectionView: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {


override func viewDidLoad(){
    super.viewDidLoad()
}

@IBAction func backButtonTapped(_ sender: AnyObject) {
    self.navigationController?.dismiss(animated: true, completion: nil)
}


@IBAction func openPhotoLibrary(_ sender: AnyObject) {
    if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.photoLibrary) {
        let imagePicker = UIImagePickerController()
        imagePicker.delegate = self
        imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary;
        imagePicker.allowsEditing = true
        present(imagePicker, animated: true, completion: nil)
        self.present(imagePicker, animated: true, completion: nil)
    }
}


func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {
    self.dismiss(animated: true, completion: nil);
}




}

不知道哪里出了问题，任何帮助都会很棒，谢谢！

【问题讨论】：

您是否要求获得照片的许可？
@MikeG 试试我的答案，让我知道它是否有效？
检查我的答案。

标签： ios swift nsexception photolibrary

【解决方案1】：

要访问照片库，您需要将Privacy - Photo Library Usage Description 放入应用程序的.plist 文件中并附上一些描述，

如图所示

特别是在您的代码中，您已经编写了代码来两次显示相同的 imagePicker，如下所示。

    present(imagePicker, animated: true, completion: nil)
    self.present(imagePicker, animated: true, completion:

因此我建议保留一个，可能是
present(imagePicker, animated: true, completion: nil)

或

self.present(imagePicker, animated: true, completion:nil)

希望对你有帮助。

编码愉快...

【讨论】：

问题是两次调用present(view)，我完全忽略了这一点，感谢您指出。
我接受了答案，点赞的目的是什么？
@MIke，赞成票是为了让其他人知道这是合适的答案，同时接受更多赞成票，让其他用户有信心使用该答案。
有道理，我同意

【解决方案2】：

当你调用imagepicker委托方法时你的语法是错误的，然后一个viewcontroller被预设来选择图像所以替换

present(imagePicker, animated: true, completion: nil)
self.present(imagePicker, animated: true, completion: nil)

有

self.presentViewController(imagePicker, animated: true, completion: nil)

在你的图像视图中没有显示图像

func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {
    "YOUR IMAGEVIEW".image = info[UIImagePickerControllerOriginalImage] as? UIImage
    self.dismiss(animated: true, completion: nil);
}

【讨论】：

【解决方案3】：

试试我的代码，你的问题会很容易解决。

@IBAction func openPhotoLibrary(_ sender: AnyObject) {
        let takePictureAction: UIAlertAction = UIAlertAction(title: "Take Picture", style: .Default) { action -> Void in
        if(  UIImagePickerController.isSourceTypeAvailable(.Camera))
        {
              let myPickerController = UIImagePickerController()
              myPickerController.delegate = self
              myPickerController.sourceType = .Camera
              self.presentViewController(myPickerController, animated: true, completion: nil)
        }else
        {
              let actionController: UIAlertController = UIAlertController(title: "Camera is not available",message: "", preferredStyle: .Alert)
              let cancelAction: UIAlertAction = UIAlertAction(title: "OK", style: .Cancel) { action -> Void in
                    //Just dismiss the action sheet
              }
              actionController.addAction(cancelAction)
              self.presentViewController(actionController, animated: true, completion: nil)

            }
        }

        actionSheetController.addAction(takePictureAction)
        //Create and add a second option action
        let choosePictureAction: UIAlertAction = UIAlertAction(title: "Choose From Camera Roll", style: .Default) { action -> Void in
            let myPickerController = UIImagePickerController()
            myPickerController.delegate = self;
            myPickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
            self.presentViewController(myPickerController, animated: true, completion: nil)
        }
        actionSheetController.addAction(choosePictureAction)

        //Present the AlertController
        self.presentViewController(actionSheetController, animated: true, completion: nil)
}

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

        "YOURIMAGEVIEW".image = info[UIImagePickerControllerOriginalImage] as? UIImage

        self.dismissViewControllerAnimated(true, completion: nil)
}

【讨论】：