Saving image to document directory
func saveImage(name:String,image:UIImage){
if let data = UIImageJPEGRepresentation(image, 0.4) {
let filename = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first?.appendingPathComponent("\(name).png")
do {
try data.write(to: filename!)
} catch {
print(error)
}
}
}