UIImagePickerControllerOriginalImage在ios 11.2.1中不起作用

Question

在什么情况下我会伤心？如果我将allowEditing设为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崩溃了（根据Crashlytics），如果有合法的条件可能会失败或者只是一个iOS错误，那就很困惑。）

Answer 1

在IOS 12中改变了

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

Answer 2

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
    }
}

通过这种方式-

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，请建议任何改进:)

Answer 3

我在Apple开发者论坛帖子中看到它，如果iOS 11上的图像大小（2048 X 2048以上），UIImagePickerControllerOriginalImage会返回nil。作为一个解决方案，该帖子建议使用Photos framework来获取所选图像。该帖子提供的解决方案如下：

Objective 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

Swift:

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
        }
    })
}