CryptLib decryption returns wrong value - swift

Question

I am using Cross-Platform-AES for my AES encryption/decryption within my swift app. My encryption is working fine. But when I try to decrypt the service returns value it doesn't give me the correct result. Here how I am doing decryption.
public func decryptStrings(text:String)->String{
let hashKey=cryptoLib.sha256(key, length: 31)
let decryptedData = cryptoLib.decrypt(text.data(using: String.Encoding.utf8), key: hashKey, iv: iv)
let decryptedString=decryptedData?.base64EncodedString()
print("decryptedString \(decryptedString! as String)")
return decryptedString!
}
Please explain me how can I decrypt this in correct way.
Thanks
ENCRYPTION
public func base64Convertion (secretcode:String)->String
{
let hashKey=cryptoLib.sha256(key, length: 31)
let encryptedData=cryptoLib.encrypt(secretcode.data(using: String.Encoding.utf8), key: hashKey, iv: iv)
let encryptedString=encryptedData?.base64EncodedString()
print("encryptedString \(encryptedString! as String)")
return encryptedString!
}

Answer 1

I solved the problem by changing the Decryption method in this way
public func decryptStrings(text:String)->String{
let hashKey=cryptoLib.sha256(key, length: 31)
let decodedData = Data(base64Encoded: text, options: Data.Base64DecodingOptions())
let decryptedData = cryptoLib.decrypt(decodedData, key: hashKey, iv: iv)
let decryptedString=String(data: decryptedData!,encoding:String.Encoding.utf8)
print("decryptedString \(decryptedString!)")
return decryptedString!
}