Swift -> Get size of image in MB

Call a simple function passing url of the image you want the size of. Size can be calculated in KB, MB or GB.       

func getImageSizeInMB(url: URL?) -> Double {
    guard let filePath = url?.path else {
        return 0.0
    }
    do {
       let attribute = try FileManager.default.attributesOfItem(atPath: filePath)
       if let size = attribute[FileAttributeKey.size] as? NSNumber {        
           return size.doubleValue / 1000000.0 // This is for MB
       }
    } catch {
       print("Error")
    }
    return 0.0
}

If you want the size in KB then divide it by 1000. If in GB divide it by 1000000000 (1e+9).

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