Question

我想在Swift中使用UIImagePickerController显示图像元数据。从图库中选择图像，并在图像视图中显示元素数据，如PixelHeight，PixelWidth，PixelXDimension，PixelYDimension，坐标，大小，创建日期和图像名称。

Answer 1

首先，您可以从UIImagePickerController获取信息[UIImagePickerControllerReferenceURL]。然后你可以做以下事情：

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.
        }
    })

如何使用Photos Framework在iOS 9中获取图像元数据

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