ios - 获取保存到相册的图片文件名

Question

在现代 iOS (2017) 中，

这实际上是我知道的唯一方法将图像保存到 iOS 照片系统，并获取文件名/路径。

import UIKit
import Photos

func saveTheImage... () {

    UIImageWriteToSavedPhotosAlbum(yourUIImage, self,
        #selector(Images.image(_:didFinishSavingWithError:contextInfo:)),
        nil)
}

func image(_ image: UIImage, didFinishSavingWithError error: NSError?, contextInfo: UnsafeRawPointer) {
    guard error == nil else {
        print("Couldn't save the image!")
        return
    }
    doGetFileName()
}

func doGetFileName() {
    let fo: PHFetchOptions = PHFetchOptions()
    fo.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
    let r = PHAsset.fetchAssets(with: PHAssetMediaType.image, options: fo)
    if let mostRecentThingy = r.firstObject {

        PHImageManager.default().requestImageData(
            for: mostRecentThingy,
            options: PHImageRequestOptions(),
            resultHandler: { (imagedata, dataUTI, orientation, info) in

                if info!.keys.contains("PHImageFileURLKey") {
                    let path = info!["PHImageFileURLKey"] as! NSURL

                    print("Holy cow. The path is \(path)")
                }
                else { print("bizarre problem") }
            })

    }
    else { print("unimaginable catastrophe") }
}

问题在于它无法在赛道条件下运行。

这非常笨拙，而且在很多方面似乎都令人担忧。

今天真的是这样吗？

Answer 1

extension PHPhotoLibrary {

    func save(imageData: Data, withLocation location: CLLocation?) -> Promise<PHAsset> {
        var placeholder: PHObjectPlaceholder!
        return Promise { fullfil, reject in
            performChanges({
                let request = PHAssetCreationRequest.forAsset()
                request.addResource(with: .photo, data: imageData, options: .none)
                request.location = location
                placeholder = request.placeholderForCreatedAsset
            }, completionHandler: { (success, error) -> Void in
                if let error = error {
                    reject(error)
                    return
                }

                guard let asset = PHAsset.fetchAssets(withLocalIdentifiers: [placeholder.localIdentifier], options: .none).firstObject else {
                    reject(NSError())
                    return
                }

                fullfil(asset)
            })
        }
    }
}

我认为您可以使用 PHPhotoLibrary 和 PHObjectPlaceholder 来做到这一点。