BLE Peripheral disconnects when navigating to different ViewController

Question

I am working on BLE iOS (Swift) application which has multiple ViewControllers. The main ViewController has a button which navigates to TableViewController which has detected BLE devices to connect with. But when I return back to main or another view the peripheral device disconnects. I tried to pass peripheral from TableViewController to main ViewController but still, it disconnects.

MainViewController:

var bleManager: BLEManager!
var peripheral: CBPeripheral!

override func viewDidLoad() {
    bleManager = BLEManager()
    super.viewDidLoad()
}

override func viewWillAppear(_ animated: Bool) {
    if let peripheral = self.peripheral {
        do {
            print("Value from display = \(peripheral.state)")
        }
    }
}

func setPeripheral(sent: CBPeripheral) {
    self.peripheral = sent
}


@IBAction func manageDevice(sender: UIButton)
{
    // 1. Instantiate TableViewController
    let tableViewController = self.storyboard?.instantiateViewController(withIdentifier: "TableViewController") as! TableViewController

    // 2. Set self as a value to delegate
    tableViewController.delegate = self

    // 3. Push SecondViewController
    self.navigationController?.pushViewController(tableViewController, animated: true)
}

How to continue BLE activities onto next view controller

Answer 1

1. You need to supply Axis=1 to apply the function to each row. 2.x in your function would be a row (not a cell).
2. You can convert x, the row, to a list.
3. Count how many times each value is in the list, and multiply it by its value.
4. Sum, and output the result.

Answer 2

Make your life easy by choosing Python over pandas.

score_dict = {'Green': 1, 'Yellow': 0.5, 'Red': 0}

df = pd.DataFrame(data)
df["total_score"] = 0.0

for index, row in df.iterrows():
   df.at[index, "total_score"] = score_dict[row["Index1"]] + score_dict[row["Index2"]]

print(df)

Answer 3

Came up with this solution.

scores = []
for index in range(len(df.index)):
    scoreTotal = 0
    for column in df.columns:
        color = df[column][index]
        scoreTotal += color_to_score(color)

    scores.append(scoreTotal)

df["Score"] = scores