CODEWITHSUNDEEP
iosarraysswiftuitableviewtableview
PedroMeira
PedroMeira

Reputation: 97

Why is the numberOfRowsInSection being called multiple times for only one section?

// Variable and ViewDidLoad

var auxRow = 0
var auxSection = 0   

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

//Number Of Sections, only one section

 override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        auxSection += 1
        print("times section: ", auxSection)
        return 1
    }

//Number Of Rows

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    auxRow += 1
    print("times row: ", auxRow)
    return 2
}

// TableView Configure the cell

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let textCellIdentifier = "cellText"
    let cell = tableView.dequeueReusableCellWithIdentifier(textCellIdentifier, forIndexPath: indexPath)
    let variable : String = indexPath.row.description
    cell.textLabel?.text = variable
    return cell

}

Output:

    times section:  1
    times row:  1
    times section:  2
    times row:  2
    times section:  3
    times row:  3
    times section:  4
    times row:  4

The method numberOfRowsInSection is being called 4 times. Why is that happening?

Upvotes: 2

Views: 4033

Answers (2)

Will M.
Will M.

Reputation: 1854

You can set a breakpoint inside your numberOfRowsInSection method to see what it is being used for internally. There is no reason why it shouldn't be called multiple times, as it is called any time the tableview internally needs to know how many rows it has. It is called 4 times because Apple's tableview code needs to know, at 4 different times, how many rows are in your one section.

Upvotes: 2

Price Ringo
Price Ringo

Reputation: 3440

Apple makes no guarantees how often UIKit may call one of your delegate methods. They own the framework. We can expect them to cache that value but nothing requires them to do that.

Upvotes: 6

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