CODEWITHSUNDEEP
iosswiftuitableview
user2167323
user2167323

Reputation: 159

Showing a blank UITableView

I am populating a UITableView with the following code in swift. Unfortunately it is show a blank tableview not sure what I am doing wrong.

class MasterTableViewController: UITableViewController
{

    var cities: [City]?

    override func awakeFromNib() {
        super.awakeFromNib()
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        let london = City(name: "London", coordinates: (51.50722, -0.12750))
        let melbourne = City(name: "Melbourne", coordinates: (-37.8136, 144.9631))
        let singapore = City(name: "Singapore", coordinates: (-23.5475000,-46.6361100))
        let saopaulo = City(name: "Sao Paulo", coordinates: (49.3297,8.57428))
        let nurbergring = City(name: "Nurbergring", coordinates: (45.58005,9.27246))
        cities?.append(london)
        cities?.append(melbourne)
        cities?.append(singapore)
        cities?.append(saopaulo)
        cities?.append(nurbergring)
        // Do any additional setup after loading the view, typically from a nib.

    }

Upvotes: 0

Views: 135

Answers (3)

Steve Trombley
Steve Trombley

Reputation: 71

Have you checked that the cell reuse identifier is correctly named on the storyboard?

Upvotes: 0

ifau
ifau

Reputation: 2120

var cities: [City]?

This line means that you declare cities as optional array, that is, it can be nil value. Because cities is only declared and not initialized at this point, its value is nil.

After that, in viewDidLoad, you create an City object and try to add it to cities array, but it will not be added, because cities has a nil value. You need initialize it first:

override func viewDidLoad()
{
    super.viewDidLoad()
    cities = [] // initialize as an empty array
    let london = City(name: "London", coordinates: (51.50722, -0.12750))
    // ...
    cities?.append(london)
    // ...
}

Upvotes: 1

Dhruv Ramani
Dhruv Ramani

Reputation: 2643

You need to implement the UITableView delegate methods. Here's what you should do :

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return cities.count
}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    var cell=tableView.dequeueReusableCellWithIdentifier("reuseIdentifier", forIndexPath: indexPath) as UITableViewCell
    cell.textLabel.text= cities[indexPath.row].name //Or add others here
    return cell
}

Here are some tutorials you should check out, which will brush up your iOS skills. And also note that the first method is optional, but it's a good practice to implement it.

Upvotes: 0

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