如何使用Photos框架在iOS 9中获取图像元数据

Question

我希望能够使用Swift中的UIImagePickerController显示图像元数据。从相册中选择图像后，将在imageView中显示图像以及元数据，如PixelHeight，PixelWidth，PixelXDimension，PixelYDimension，Coordinates，Size，Date Created和Imagename。

- vishal aanuj

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可能是通过UIImagepickerController在Swift中获取元数据的重复问题。 - Scriptable

Answer 1

首先，您可以从UIImagePickerController获取info [UIImagePickerControllerReferenceURL]中的信息。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.
        }
    })

- SuperBi