CODE EXAMPLE FOR SWIFT

swift get file size from url

extension URL {
    func fileSizeInMB() -> Double {
        var fileSize: Double = 0.0
        var fileSizeValue = 0.0
        try? fileSizeValue = (self.resourceValues(forKeys: [URLResourceKey.fileSizeKey]).allValues.first?.value as! Double?)!
        if fileSizeValue > 0.0 {
            fileSize = (Double(fileSizeValue) / (1024 * 1024))
        }
        return fileSize
    }
}