在不加载资源的情况下获取 PHAsset 的文件大小？

Question

有没有办法在不执行 requestImageDataForAsset 或将其转换为 ALAsset 的情况下获取 PHAsset 磁盘上的文件大小？我正在加载用户照片库的预览 - 可能有数千个 - 并且我的应用程序必须在导入之前知道它们的大小。

Answer 1

您可以获取 PHAsset 的 fileSize 并将其转换为人类可读的形式，如下所示：

      let resources = PHAssetResource.assetResources(for: yourAsset) // your PHAsset

      var sizeOnDisk: Int64? = 0

      if let resource = resources.first {
        let unsignedInt64 = resource.value(forKey: "fileSize") as? CLong
        sizeOnDisk = Int64(bitPattern: UInt64(unsignedInt64!))
      }

然后使用您的 sizeOnDisk 变量并将其传递到这样的方法中...

func converByteToHumanReadable(_ bytes:Int64) -> String {
     let formatter:ByteCountFormatter = ByteCountFormatter()
     formatter.countStyle = .binary

     return formatter.string(fromByteCount: Int64(bytes))
 }

Answer 2

更安全的解决方案：

[asset requestContentEditingInputWithOptions:nil completionHandler:^(PHContentEditingInput * _Nullable contentEditingInput, NSDictionary * _Nonnull info) {
    NSNumber *fileSize = nil;
    NSError *error = nil;
    [contentEditingInput.fullSizeImageURL getResourceValue:&fileSize forKey:NSURLFileSizeKey error:&error];
    NSLog(@"file size: %@\nerror: %@", fileSize, error);
}];

Swift版本：

asset.requestContentEditingInput(with: nil) { (contentEditingInput, _) in
    do {
        let fileSize = try contentEditingInput?.fullSizeImageURL?.resourceValues(forKeys: [URLResourceKey.fileSizeKey]).fileSize
        print("file size: \(String(describing: fileSize))")
    } catch let error {
        fatalError("error: \(error)")
    }
}

灵感来自

Answer 3

请试试这个。

let resources = PHAssetResource.assetResources(for: YourAsset)
var sizeOnDisk: Int64 = 0

if let resource = resources.first {
   let unsignedInt64 = resource.value(forKey: "fileSize") as? CLong
   sizeOnDisk = Int64(bitPattern: UInt64(unsignedInt64!))

   totalSize.text = String(format: "%.2f", Double(sizeOnDisk) / (1024.0*1024.0))+" MB"
}

Answer 4

SWIFT 5.0 轻松简单：

private static let bcf = ByteCountFormatter()

func getSize(asset: PHAsset) -> String {
    let resources = PHAssetResource.assetResources(for: asset)

    guard let resource = resources.first,
          let unsignedInt64 = resource.value(forKey: "fileSize") as? CLong else {
              return "Unknown"
          }

    let sizeOnDisk = Int64(bitPattern: UInt64(unsignedInt64))
    Self.bcf.allowedUnits = [.useMB]
    Self.bcf.countStyle = .file
    return Self.bcf.string(fromByteCount: sizeOnDisk)
}

在不加载资源的情况下获取 PHAsset 的文件大小？

Get file size of PHAsset without loading in the resource?

image

photolibrary

swift

phasset