Custom UITableViewCell in Swift programmatically

Question

I'm looking to programmatically create a UITableView and corresponding custom UITableViewCell in Swift. The table view is working great, but it doesn't seem like the cell labels are instantiating - they come back as nil.

I also don't know how to refer to the content view size when sizing elements.

UITableViewCell

import UIKit

class BusUITableViewCell: UITableViewCell {

    var routeNumber: UILabel!
    var routeName: UILabel!

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    override init(style: UITableViewCellStyle, reuseIdentifier: String!) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
    }


    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
        routeName = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 50)) // not sure how to refer to the cell size here

        contentView.addSubview(routeNumber)
        contentView.addSubview(routeName)
    }

    override func setSelected(selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }

}

UITableView delegate and source

import Foundation
import UIKit

class BusUITableView: NSObject, UITableViewDelegate, UITableViewDataSource {

    var routeService: RouteService = RouteService()

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

        var busRoutes: [Route] = routeService.retrieve()
        return busRoutes.count
    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

        var cell:BusUITableViewCell = tableView.dequeueReusableCellWithIdentifier("cell") as BusUITableViewCell

        var busRoutes: [Route] = routeService.retrieve()

        cell.routeName.text = "test"  // test string doesn't work, returns nil
        return cell
    }

    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {


    }

}

View Controller

    mainTableView.registerClass(BusUITableViewCell.self, forCellReuseIdentifier: "cell")

Dom Bryan · Accepted Answer · 2018-04-08 00:49:17Z

5

If you aren't linking to a prototype cell in a storyboard then you need to register the class for your cell against your tableView using registerClass(_ cellClass: AnyClass, forCellReuseIdentifier identifier: String)

In your case you would use something like this

  tableview.register(BusUITableViewCell.self, forCellReuseIdentifier:"cell")

Also, without a NIB file, awakeFromNib won't be invoked.

Edit: .registerClass() has been renamed to .register()

edited Apr 8, 2018 at 0:49

Dom Bryan

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answered Jan 2, 2015 at 23:01

Paulw11

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4 Comments

Robert Hirsch Over a year ago

Sorry...already had that line in my view controller. Still doesn't work.

Paulw11 Over a year ago

I don't see where you actually instantiate the UILabel instance for routeName

Paulw11 Over a year ago

Have you set a breakpoint in awakeFromNib? Does it actually get called without a nib file?

Robert Hirsch Over a year ago

Ah...seems as though awakeFromNib isn't called if there is no nib file. I instantiated the routeName in the init block and it worked!

BonanzaDriver · Accepted Answer · 2018-04-08 01:02:24Z

1

Considering you are doing this "programmatically" (no nib file), you're awakeFromNib() will never invoke. You can create a nib, and link it to this backing file, and still create and use the cell programmatically. Or ... choose a different place (like the initializer) to create and add subviews to the cell.

answered Apr 8, 2018 at 1:02

BonanzaDriver

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