UITableView单元格重复

Question

I created a tableview with a custom cell showing data. The display works fine. But the cells are repeating so there are more cells being displayed then items in the array.

 override func numberOfSectionsInTableView(tableView: UITableView) -> Int {    
    // when searchcontroller is active, return the number of search results. If inactive simply return the count of the full AED list.
        return self.AEDItems.count
    }

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

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cellIdentifier = "Cell"
        let cell:CustomTableViewCell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as! CustomTableViewCell

        // Check if controller is active. If user is doing a search retrieve the aeds from the search result rather than the AED array.
        let aed = self.AEDItems[indexPath.row]
        cell.addressLabel?.text = aed.owner
        cell.objectLabel?.text = aed.street

        return cell
    }

Why is this happening? I guess it has something to do with the cell reuseage. But does the count of items does not solve it?

Answer 1

The problem is this method:

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {    
// when searchcontroller is active, return the number of search results. If inactive simply return the count of the full AED list.
    return self.AEDItems.count
}

This method is asking for the number of sections. You should return simply 1 from this method.

Instead, you have as many sections as you do objects in your AEDItems array. And then in your other methods, you're not putting any section specific logic. So every section is identical to each other. But we actually only want one section with many rows.

So, we actually want simply:

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {    
// when searchcontroller is active, return the number of search results. If inactive simply return the count of the full AED list.
    return 1
}

Or, as @johnpatrickmorgan clarifies in the comments, we can omit this optional protocol method entirely, as UITableView assumes only a single section if its datasource has omitted this method.

For more reading, check out the UITableView Data Source protocol documentation regarding numberOfSectionsInTableView: .

Answer 2

You need to have only section. If it is one then Make it one only. If you have multiple sections and data for each section then use that data for each section

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {    
// when searchcontroller is active, return the number of search results. If inactive simply return the count of the full AED list.
    return 1 
    //return self.AEDItems.count
}

To experience Section, use below methods of UITableView

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

return "Section"
}

func tableView (tableView:UITableView , heightForHeaderInSection section:Int)->Float 
{
    return 20.0
}

I would suggest you to check this tutorial Customizing Header and Footer of Table View in iOS8 with Swift

Answer 3

You are returning array's count for section that's why it is happening so please return 1 section .

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {    
    // when searchcontroller is active, return the number of search results. If inactive simply return the count of the full AED list.
        return 1
    }