如何从UIImagePickerController快速获取UIImage元数据？就像“ .location”

问题描述

这是我尝试的代码

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： 我也尝试使用PHAsset，但始终返回nil。 还可以找到一些建议，但是所有建议都已弃用。

解决方法

您需要先将图像存储在PHAsset中，然后才能获得资产对象。

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)
            }
        }
    }
}

请让我知道是否有任何疑问。

,

您的代码很好。只需授予“相机”应用的位置权限
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)