如何使用 AVFoundation 獲取 iPhone 相機的焦距

Question

如何找到 iPhone 相機鏡頭的焦距。 我已經通過這個找到了鏡頭光圈值：- let aperture = currentcamera?.lensAperture
print("Aperture of camera is:-",aperture!)

Answer 1

為此，您需要首先從相機中獲取圖像，然后從返回的 Exif 數據中讀取其焦距屬性。 示例代碼在這里給出並復制如下以供參考：

// delegate method for the image picker
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

    let metadata = info[UIImagePickerControllerMediaMetadata] as? NSDictionary
    let exifdata = metadata!["{Exif}"] as! NSDictionary

    // focal length
    let focalLength = exifdata["FocalLength"] as! Double

    print("Focal length \(focalLength)")
}