ios – Swift访问EXIF字典

概述信息：使用 Swift和CGImageSourceCreateWithURL函数. 我正在尝试从URL加载文件,然后编辑包含该特定照片中所有数据的字典. 这是.swift文件中的代码. let url = NSURL(string: "http://jwphotographic.co.uk/Images/1.jpg") let imageSource = CGImageSourceCrea 信息：使用 Swift和CGImageSourceCreateWithURL函数.

我正在尝试从URL加载文件,然后编辑包含该特定照片中所有数据的字典.

这是.swift文件中的代码.

let url = NSURL(string: "http://jwphotographic.co.uk/Images/1.jpg")    let imageSource = CGImageSourceCreateWithURL(url,nil)    let imagePropertIEs = CGImageSourcecopyPropertIEsAtIndex(imageSource,nil) as Dictionary    println(imagePropertIEs)    //this is an example    let aperture = imagePropertIEs[kCGImagePropertyGPSLatitude] as! NSNumber!    /*    //these are all being defined as nil    //Load the ones from the exif data of the file    let lensUsed = imagePropertIEs[kCGImagePropertyExifFocalLength]    let aperture = imagePropertIEs[kCGImagePropertyExifApertureValue] as!    let isoSpeed = imagePropertIEs[kCGImagePropertyExifISOSpeedratings] as! NSNumber    let latitude = imagePropertIEs[kCGImagePropertyGPSLatitude] as! NSNumber    let longitude = imagePropertIEs[kCGImagePropertyGPSLongitude] as! NSNumber    let shutterSpeed = imagePropertIEs[kCGImagePropertyExifShutterSpeedValue] as! NSNumber    let cameraname = imagePropertIEs[kCGImagePropertyExifBodySerialNumber] as! NSNumber    */    println(aperture)

尽管图像属性打印的所有数据都是预期的,但无论我从imagePropertIEs字典中提取的是什么,它总是返回为null – 例如示例中的’aperture’. imagePropertIEs打印为;

[{TIFF}: {     Artist = JOHN;     copyright = "[email protected]";     DateTime = "2015:07:31 21:07:05";     Make = Canon;     Model = "Canon EOS 7D Mark II";     ResolutionUnit = 2;     Software = "Adobe Photoshop lightroom 6.0 (Macintosh)";     XResolution = 72;     YResolution = 72;},{IPTC}: {     Byline =     (       JOHN     );     copyrightNotice = etc.. etc..

我已经做了很多研究和测试,我根本无法解决我在访问这本词典中的元素时所做的错误 – 有人能举例说明如何将变量设置为字典中的“Model”元素？

解决方法 在Swift 3.0中,我找到了以下解决方案

let url = NSURL(string: "http://jwphotographic.co.uk/Images/1.jpg")let imageSource = CGImageSourceCreateWithURL(url,nil)let imagePropertIEs = CGImageSourcecopyPropertIEsAtIndex(imageSource,nil) as Dictionary?let exifDict = imagePropertIEs?[kCGImagePropertyExifDictionary]

现在您可以通过例如访问exif-Tags

let dateTimeOriginal = exifDict?[kCGImagePropertyExifDateTimeOriginal]Swift.print("dateTimeOriginal: \(dateTimeOriginal)")

您将获得可选值,如果有值或零,则必须进行测试.有关可用属性常量的列表,请查看apple documentation.

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