Myujth

I have a struct that conforms to the Codable protocol. I make an URLSession request and receive an JSON response. I encode the response into my custom struct that looks something like this.

struct Weather: Codable 
 let time: Date
 let location: String
 let timeEvents: [TimeEvents]
 

struct TimeEvents: Codable 
 let validTime: Date
 let parameters: [Parameters]


struct Parameters: Codable 
 let name: String
 let unit: String
 let values: [Double]

I get a single object Weather. However, inside the object Weather I want to populate the validTime, i.e. 01/01/2018 12:00, with the corresponding name matching "temperature" and corresponding values, i.e. 10.5 C.

So the rows will look something like:

[01/01/2018 12:00 : 10.5C]
[01/01/2018 13:00 : 11.5C]
[01/01/2018 14:00 : 11.6C]
.
.
.
[02/01/2018 00:00 : 3.1C]
[02/01/2018 01:00 : 3.1C]

In my controller I have something like:

var testWeatherObject : [Weather] = 

I only want a single header at the top displaying a single location i.e. New York.

override func numberOfSections(in tableView: UITableView) -> Int 
 return 1


override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 return testWeatherObject[section].timeEvents.count

The above crashes my app. I'm not sure how to get the correct row counts.

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
 let cell = tableView.dequeueReusableCell(withIdentifier: "WeatherDataCell", for: indexPath)

 return cell

You may access an empty array so

return testWeatherObject.first?.timeEvents.count ?? 0

If you don't have sections you don't need to implement numberOfSections(in tableView: UITableView)

If you're only working with a single Weather object why not change the definition of testWeatherObject to

var testWeatherObject = [TimeEvents]

and your numberOfRowsInSection would then become

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 return testWeatherObject.count

If you want to have just single section, you don't have to set this. Delete these lines of code:

override func numberOfSections(in tableView: UITableView) -> Int 
 return 1

And now if you want to have single table view cell for each timeEvent you should create your weather object

var testWeatherObject = // your Weather object

and in data source method numberOfRowInSection just say I want as many cells as testWeatherObject has timeEvents

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 return testWeatherObject.timeEvents.count

However I recommend not to use your Weather object as variable. Instead you should create array of TimeEvents

var timeEvents = [/* your TimeEvents objects*/]

and in table view data source method use just this

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
 return timeEvents.count

It’s crashing because you’re trying to access a nested array that is empty.

I would check to see if testWeatherObjects.count is 0 first. If not then you can go ahead and use testWeatherObject[section].timeEvents.count

Does the identifier of cell defined in storyboard or xib match "WeatherDataCell"?

I made a simple tableview app sample.
https://github.com/y-okudera/TableViewDemoApp

I hope to be helpful.