UIImagePickerControllerOriginalImage 在 ios 11.2.1 中不起作用答案

【问题标题】：UIImagePickerControllerOriginalImage is not working in ios 11.2.1UIImagePickerControllerOriginalImage 在 ios 11.2.1 中不起作用
【发布时间】：2018-06-07 02:07:45
【问题描述】：

在什么情况下我会难过？如果我将allowEditing 设置为 false。

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let selectedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
        // I am happy :)
    } else {
        // I am sad :(
    }
    dismiss(animated: true, completion: nil)
}

（我在 iOS 11.2.1 iPhone SE（根据 Crashlytics）中遇到了崩溃，如果存在可能失败的合法条件或者这只是一个 iOS 错误，我会感到困惑。）

【问题讨论】：

你在plist中设置权限描述了吗？
@RichieRich，是的，它适用于我的大多数用户。

标签： ios swift uiimage uiimagepickercontroller ios11.2

【解决方案1】：

在 IOS 12 中发生了变化

  image.image = info[UIImagePickerController.InfoKey.originalImage] as? UIImage

【讨论】：

【解决方案2】：

我在 Apple 开发者论坛线程中读到，如果 iOS 11 上的图像尺寸较大（大于 2048 X 2048）UIImagePickerControllerOriginalImage 将返回 nil。作为解决方法，该帖子建议使用Photos framework 来获取挑选的图像。该帖子中提供的解决方案如下：

目标 C：

__block UIImage *image = (UIImage *) [info objectForKey:UIImagePickerControllerOriginalImage];  
if (@available(iOS 11.0, *))  
{   
    PHAsset * asset = (PHAsset*)[info objectForKey:UIImagePickerControllerPHAsset];  
    PHImageManager *manager = [PHImageManager defaultManager];  
    PHImageRequestOptions *requestOptions = [[PHImageRequestOptions alloc] init];  
    requestOptions.resizeMode = PHImageRequestOptionsResizeModeExact;  
    requestOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;  
    requestOptions.synchronous = true;  
    [manager requestImageForAsset:asset targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeDefault options:requestOptions resultHandler:^void(UIImage *img, NSDictionary *info) {  
       if(img != nil)  
       {  
          image = img;  
       }  
    }];  
}

参考：iOS 11 does not return the original image for large images with UIImagePickerControllerOriginalImage

斯威夫特：

var image = info[UIImagePickerControllerOriginalImage]
if #available(iOS 11.0, *)
{
    let asset                    = info[UIImagePickerControllerPHAsset] as! PHAsset
    let manager                  = PHImageManager.default()
    let requestOptions           = PHImageRequestOptions()
    requestOptions.resizeMode    = PHImageRequestOptionsResizeMode.exact
    requestOptions.deliveryMode  = PHImageRequestOptionsDeliveryMode.highQualityFormat
    requestOptions.isSynchronous = true
    manager.requestImage(for: asset, targetSize: PHImageManagerMaximumSize, contentMode: PHImageContentMode.default, options: requestOptions, resultHandler: { (img, info) in
        if img != nil
        {
            image = img
        }
    })
}

【讨论】：

@Midhun 获得img==nil 的可能情况是什么？
@CamiloAguilar：一种情况是，您已保存资产 url 并删除了图像，然后使用已删除的 url 请求图像。在这种情况下，图像将为零。
我的原始图像为零。这对我有用。

【解决方案3】：

方法签名改变如下：

  func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

    guard let selectedImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage else {
        fatalError("Expected a dictionary containing an image, but was provided the following: \(info)")
    }

    // Set photoImageView to display the selected image.
    photoImageView.image = selectedImage

    // Dismiss the picker.
    dismiss(animated: true, completion: nil)
}

注意第二个参数：

didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]

它不是前面方法签名中的字符串数组。

【讨论】：

【解决方案4】：

我最终使用了这个：

import Photos

extension UIImage {
    static func from(info: [String : Any]) -> UIImage? {
        if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
            return image
        }

        var imageToBeReturned: UIImage?
        if let url = info[UIImagePickerControllerReferenceURL] as? URL,
            let asset = PHAsset.fetchAssets(withALAssetURLs: [url], options: nil).firstObject {
            let manager = PHImageManager.default()
            let option = PHImageRequestOptions()
            option.isSynchronous = true
            manager.requestImage(for: asset, targetSize: CGSize(width: 1000, height: 1000), contentMode: .aspectFit, options: option, resultHandler: {(image: UIImage?, info: [AnyHashable : Any]?) in
                imageToBeReturned = image
            })
        }
        return imageToBeReturned
    }
}

这样-

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let selectedImage = UIImage.from(info: info) {
        // I am happy :)
    } else {
        // I am sad :(
    }
    dismiss(animated: true, completion: nil)
}

这对我有用，请提出任何改进建议:)

【讨论】：