如何使用照片框架在 iOS 9 中获取图像元数据

Question

我想在 Swift 中使用 UIImagePickerController 显示图像元数据。 其中图像是从图库中选择的，并将与 PixelHeight、PixelWidth、PixelXDimension、PixelYDimension、Coordinates、Size、Date Created 和 Imagename 等元数据一起显示在 imageView 中。

Answer 1

首先，您可以从 UIImagePickerController 获取 info[UIImagePickerControllerReferenceURL]。然后您可以执行以下操作：

let assetURL = info[UIImagePickerControllerReferenceURL] as! NSURL
let asset = PHAsset.fetchAssetsWithALAssetURLs([assetURL], options: nil)
guard let result = asset.firstObject where result is PHAsset else {
        return
    }

let imageManager = PHImageManager.defaultManager()
imageManager.requestImageDataForAsset(result as! PHAsset, options: nil, resultHandler:{
        (data, responseString, imageOriet, info) -> Void in
        let imageData: NSData = data!
        if let imageSource = CGImageSourceCreateWithData(imageData, nil) {
            let imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil)! as NSDictionary
            //now you have got meta data in imageProperties, you can display PixelHeight, PixelWidth, etc.
        }
    })