永远不会调用Tableview方法

Question

I have an iOS app where I added a UITableView to my view in Interface Builder. Then I set up the tableview in the UIViewController like this:

tableView.rowHeight = UITableViewAutomaticDimension
tableView.estimatedRowHeight = 50
tableView.delegate = self
tableView.dataSource = self
tableView.contentInset = UIEdgeInsets(top: 25, left: 0, bottom: 0, right: 0)

And I also implemented the following methods:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    print("test table")
    let course = self.courses[indexPath.row]
    let cell = tableView.dequeueReusableCell(withIdentifier: CourseTableViewCell.identifier, for: indexPath) as! CourseTableViewCell

    cell.make(course, location: self.currentLocation)

    return cell
}

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

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

However, the methods are never called, the table view isn't being displayed and I get no errors in my console? Is there something I missed while trying to add this?

Thanks.

As per request in the comments:

• The courses array is not empty
• The courses array is being filled before reloadData()

Answer 1

Try this instead of your code :

@IBOutlet weak var tableView: UITableView!{
    didSet {
        self.tableView.delegate = self
        self.tableView.dataSource = self
    }
}

Make sure your controller is conforming to the two protocols: UITableViewDelegate and UITableViewDataSource

Then add this method to make sure that your cells do not have 0 pts height:

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return 80 // adjust height of row as needed 
}

Answer 2

just try to implements "heightForRowAtIndexPath" I think your table is properly reloaded but due to constraints in cell UITableViewAutomaticDimension is not working. 2 - make sure courses is properly allocated, use Debugger in numberOfRowsAtIndexPath to check items in courses

Answer 3

You should test if the delegate methods are executed by setting a breakpoint in a method like numberOfSections or numberOfRowsInSection.

When the breakpoint doesn't get hit the delegates are not set properly.