Showing property in tablecell

Question

Created Jun ’19

Replies 32

Boosts 0

Views 3.9k

Participants 4

I am following a course and am trying so test myself.
I have a model and I give values to properties from a json-file.
(If Im showing code wrong please tell me how I shoud do it)

This works:

func updateUIWithWeatherData() {

cityLabel.text = weatherDataModel.city

temperatureLabel.text = String(weatherDataModel.temperature)

weatherIcon.image = UIImage(named: weatherDataModel.weatherIconName)

}

But here it doesn't. Test shows but not the city.

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

let cell = UITableViewCell(style: .default, reuseIdentifier: "Cell")

cell.textLabel?.text = weatherDataModel.city

//cell.textLabel?.text = "test"

return cell

}

Answer 1

OOPer OP

Jul ’19

When you get Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value, the first thing you need to do is finding on which line this runtime-error has occurred.

Something is nil, that should not be nil included in the line.

For example, if you get that error on this line:

tableView.delegate = self

Then `tableView` is nil, that should not be nil. This happens when you do not connect the IBOutlet properly.

So, on which line that is happening?

Answer 2

net777 OP

Jul ’19

Yes, it is at the line

tableView.delegate = self

That the error fist occurs.

But I can show a value set in

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

But not the value from the model.
So I can do

cell.textLabel?.text = "test"

But not

cell.textLabel?.text = self.weatherDataModel.city

But I know that the value is set in function

updateWeatherData

Answer 3

Claude31 OP

Jul ’19

Key question: have you checked that tableView IBOutlet is effectively connected to the UITableView in IB ?

Answer 4

net777 OP

Jul ’19

Not sure.
I connected the outlet to source and delegate.
If this was working I'm not sure.
How can I check this?

Answer 5

OOPer OP

Jul ’19

Accepted Answer

But I can show a value set in

That has nothing to do with IBOutlet connection.

You need to open the storyboard editor and connect your Table View in design canvas to the IBOutlet `tableView` in the code.

Answer 6

Claude31 OP

Jul ’19

When you look at the code, you have a white circle on the left of

@IBOutlet weak var tableView: UITableView!

If the circle is empty, you are not connected.

If black you are connected to something. If you hover the mouse over the dot, whist having the storyboards opened in other pane, you should see the tableView being hilited.

If not:

- drag from the circle to the tableView in storyboard

- release when tableView gets hilited.

Answer 7

net777 OP

Jul ’19

It worked!

Thank you both!
I'm sorry that I couldn't mark both as correct answers.
Clearly I have to learn more about the basics.
One question: Could I have made this connection completely in code?

Question two: I want to display two values in one cell. The staition from the API on the left and the time on the right.

Without explaining everything, could you give me a hint to the right solution?