Swift static tableview with dynamic section - ios

Question

I have tableviewcontroller, with 2 sections.
First(static) section have 2 rows, and second section should be dynamic.
Storyboard:
Code:
class DocumentInventoryChangeTableViewController: UITableViewController {
var results: [String] = ["Dog", "Cat", "Snake", "Test"]
override func viewDidLoad() {
super.viewDidLoad()
tableView.registerNib(UINib(nibName: "DocumentInventoryCell", bundle: nil), forCellReuseIdentifier: "DocumentInventoryCell")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 2
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if section == 1 {
return results.count
}
return 2
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell: UITableViewCell!
if indexPath.section == 0 {
cell = super.tableView(tableView, cellForRowAtIndexPath: indexPath)
} else {
cell = tableView.dequeueReusableCellWithIdentifier("DocumentInventoryCell", forIndexPath: indexPath)
cell.textLabel?.text = results[indexPath.row]
}
return cell
}
}
But i'm getting this error:
Terminating app due to uncaught exception 'NSRangeException', reason:
'*** -[__NSArray0 objectAtIndex:]: index 0 beyond bounds for empty
NSArray'

Answer 1

In my experience, it was enough to override these methods in UITableViewController:
tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat
tableView(tableView: UITableView, indentationLevelForRowAtIndexPath indexPath: NSIndexPath) -> Int
If you want to have custom table view cell in your table view, you need to crate subclass of UITableViewCell also with nib, and register it to your table view.
My whole controller looks like this:
var data = ["Ahoj", "Hola", "Hello"]
override func viewDidLoad() {
super.viewDidLoad()
tableView.registerNib(UINib(nibName: "CustomCell", bundle: nil), forCellReuseIdentifier: "reuseIdentifier")
}
// MARK: - Table view data source
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if section == 1 {
return data.count
}
return super.tableView(tableView, numberOfRowsInSection: section)
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
if indexPath.section == 1 {
let cell = tableView.dequeueReusableCellWithIdentifier("reuseIdentifier", forIndexPath: indexPath) as! CustomCell
cell.titleLabel.text = data[indexPath.row]
return cell
}
return super.tableView(tableView, cellForRowAtIndexPath: indexPath)
}
override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return 44
}
override func tableView(tableView: UITableView, indentationLevelForRowAtIndexPath indexPath: NSIndexPath) -> Int {
return 0
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
tableView.deselectRowAtIndexPath(indexPath, animated: true)
if indexPath.section == 1 {
print(data[indexPath.row])
}
}
#IBAction func addItem() {
data.append("Item \(data.count)")
tableView.beginUpdates()
tableView.insertRowsAtIndexPaths([NSIndexPath(forRow: data.count - 1, inSection: 1)], withRowAnimation: .Left)
tableView.endUpdates()
}
#IBAction func removeItem() {
if data.count > 0 {
data.removeLast()
tableView.beginUpdates()
tableView.deleteRowsAtIndexPaths([NSIndexPath(forRow: data.count, inSection: 1)], withRowAnimation: .Left)
tableView.endUpdates()
}
}

Answer 2

The problem is that there is no such thing as a table view where the "First(static) section have 2 rows, and second section should be dynamic." Your table view needs to be entirely dynamic; that is, it should show a prototype cell, not static contents, in the storyboard, and its entire contents should be configured in code, including the first section — even though the first section never changes.