如何快速从 UIImagePickerController 获取 UIImage 元数据？像“.location”

Posted 2023-02-23

【中文标题】如何快速从 UIImagePickerController 获取 UIImage 元数据？像“.location”

【英文标题】：How to get UIImage metadata from UIImagePickerController in swift ? like ".location"

【发布时间】：2020-10-22 05:48:02

【问题描述】：

这是我尝试过的代码

public func imagePickerController(_ picker: UIImagePickerController,
                                  didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) 
    guard let image = info[.editedImage] as? UIImage else 
        return self.pickerController(picker, didSelect: nil)
    
    if let asset: PHAsset = info[UIImagePickerController.InfoKey.phAsset] as? PHAsset 
        print("Asset: \(asset)")
        print("Creation Data \(String(describing: asset.creationDate))")
        print("Location: \(String(describing: asset.location))")
        print("burstIdentifier: \(String(describing: asset.burstIdentifier))")
        print("burstSelectionTypes: \(String(describing: asset.burstSelectionTypes))")
        print("duration: \(String(describing: asset.duration))")
        print("mediaSubtypes: \(String(describing: asset.mediaSubtypes))")
        print("mediaType: \(String(describing: asset.mediaType))")
        print("pixelHeight: \(String(describing: asset.pixelHeight))")
        print("pixelWidth: \(String(describing: asset.pixelWidth))")
        print("sourceType: \(String(describing: asset.sourceType))")
     else 
        print("Asset: nil")
    
    self.pickerController(picker, didSelect: image)

注意： 我也尝试过使用 PHAsset，但它总是返回 nil。 还可以找到一些建议，但都已弃用。

【参考方案1】：

您需要先将图像存储在 PHAsset 中，然后您将获得资产对象。

if let originalImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage 
        self.getAssetAfterStoreImage(image: originalImage)  (assetInstance) in
            //asset
            print(assetInstance)
        
    


func getAssetAfterStoreImage(image:UIImage,completion:@escaping (PHAsset) -> Void)
    
    phphotoLibrary.shared().performChanges(
        
        PHAssetChangeRequest.creationRequestForAsset(from: image)
    )  saved, error in
        
        if saved 
            let fetchOptions = PHFetchOptions()
            fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: true)]
            
            // After uploading we fetch the PHAsset for most recent video and then get its current location url
            if let fetchResult = PHAsset.fetchAssets(with:.image, options: fetchOptions).lastObject
                completion(fetchResult)
            
        
    

如有任何疑问，请告诉我。

【参考方案2】：

您的代码很好。只需为相机应用授予位置权限 这是授予权限的步骤。 设置应用 -> 隐私 -> 定位服务（第一个选项） -> 相机 -> 选择选项使用应用时

您的代码输出

Asset: <PHAsset: 0x114d25100> BE7D9140-3D8D-4EAC-8D1F-F97991A9E1EF/L0/001 mediaType=1/0, sourceType=1, (2448x3264), creationDate=2020-10-22 06:26:50 +0000, location=1, hidden=0, favorite=0 
Creation Data Optional(2020-10-22 06:26:50 +0000)
Location: Optional(<+23.043114450,+72.6401118833> +/- 0.00m (speed 0.00 mps / course 95.04) @ 01/01/01, 5:30:00 AM India Standard Time)
burstIdentifier: nil
burstSelectionTypes: PHAssetBurstSelectionType(rawValue: 0)
duration: 0.0
mediaSubtypes: PHAssetMediaSubtype(rawValue: 0)
mediaType: PHAssetMediaType
pixelHeight: 3264
pixelWidth: 2448
sourceType: PHAssetSourceType(rawValue: 1)

【讨论】：

是的@iParesh，对，但我们还需要在应用程序中设置权限，而不是获得位置。