Sub-Class multiple Cells - ios

In my UITableView I have Four cell. Each cell has its own class. But I can only return one of the cells. Here is my code
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let firstCell = tableView.dequeueReusableCellWithIdentifier("FirstCell", forIndexPath: indexPath) as! FirstTableViewCell
let secondCell = tableView.dequeueReusableCellWithIdentifier("SecondCell", forIndexPath: indexPath) as! SecondTableViewCell
let thirdCelll = tableView.dequeueReusableCellWithIdentifier("ThirdCell", forIndexPath: indexPath) as! ThirdTableViewCell
let fourthCell = tableView.dequeueReusableCellWithIdentifier("FourthCell", forIndexPath: indexPath) as! FourthTableViewCell
return firstCell
}
How do I Correctly sub class and return them


func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
if indexPath.row == 0 // or your custom condition
{ let firstCell = tableView.dequeueReusableCellWithIdentifier("FirstCell", forIndexPath: indexPath) as! FirstTableViewCell
return firstCell
}
else if indexPath.row == 1{
let secondCell = tableView.dequeueReusableCellWithIdentifier("SecondCell", forIndexPath: indexPath) as! SecondTableViewCell
return secondCell
}
indexPath.row == 2{
let thirdCelll = tableView.dequeueReusableCellWithIdentifier("ThirdCell", forIndexPath: indexPath) as! ThirdTableViewCell
return thirdCelll
}
else{
let fourthCell = tableView.dequeueReusableCellWithIdentifier("FourthCell", forIndexPath: indexPath) as! FourthTableViewCell
return fourthCell
}
}


This function is called multiple times. The indexPath.row would be used to determine which cell to return. You should check the value of this and only return the requested cell.
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell
switch indexPath.row {
case 0:
cell = tableView.dequeueReusableCellWithIdentifier("FirstCell", forIndexPath: indexPath) as! FirstTableViewCell
case 1:
cell = tableView.dequeueReusableCellWithIdentifier("SecondCell", forIndexPath: indexPath) as! SecondTableViewCell
case 2:
cell = tableView.dequeueReusableCellWithIdentifier("ThirdCell", forIndexPath: indexPath) as! ThirdTableViewCell
case 3:
cell = tableView.dequeueReusableCellWithIdentifier("FourthCell", forIndexPath: indexPath) as! FourthTableViewCell
}
return cell;
}

Related

Value of type 'UICollectionViewCell?' has no member 'contentImage'

I have two custom UICollectionViewCells(AddImageCollectionViewCell, ItemCollectionViewCell) which I am loading depending on indexpath. Here is my code for the cellForItemAtIndexpath-
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
var cell :UICollectionViewCell!
if indexPath.row == 0{
cell = collectionView.dequeueReusableCell(withReuseIdentifier: "addImageCell", for: indexPath) as! AddImageCollectionViewCell
}
else{
cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ItemCell", for: indexPath) as! ItemCollectionViewCell
cell.contentImage = self.droppedItemList[indexPath.row] //error here
}
return cell
}
I am getting the error as "Value of type 'UICollectionViewCell?' has no member 'contentImage'". Why is my cell in the else clause is not cast to "ItemCollectionViewCell" type.
I know, I must be doing something very foolish. I would be really grateful if someone can point me to the right direction.

You are declaring cell as basic type UICollectionViewCell, that's the reason. Return the cells separately
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if indexPath.row == 0 {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "addImageCell", for: indexPath) as! AddImageCollectionViewCell
return cell
} else {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ItemCell", for: indexPath) as! ItemCollectionViewCell
cell.contentImage = self.droppedItemList[indexPath.row]
return cell
}
}

Multiple uitableview in a viewcontroller give an error

i have a problem with the following code that manage two uitableview in a viewcontroller. When insert the data in a modal controller in the 'directionTableView' give a follow error:
Thread 1: signal SIGABRT
'Could not cast value of type 'UITableViewCell' (0x1059e7560) to 'FoodTime.DirectionRecipeTableViewCell' (0x101388bf0). 2018-05-23 21:50:12.160281+0200 FoodTime[4577:360265] Could not cast value of type 'UITableViewCell' (0x1059e7560) to 'FoodTime.DirectionRecipeTableViewCell' (0x101388bf0).'
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
var cell = UITableViewCell()
if (tableView == self.ingredientTableView)
{
let cell = tableView.dequeueReusableCell(withIdentifier: "newIngredientCell", for: indexPath) as! IngredientRecipeTableViewCell
let ingredientCell = ingredients[indexPath.row]
cell.textLabel?.text = ingredientCell.titleIngredientRecipe
cell.detailTextLabel?.text = ingredientCell.subtitleIngredientRecipe
}
else if (tableView == self.directionTableView)
{
//Thread 1: signal SIGABRT on next line
let cell = tableView.dequeueReusableCell(withIdentifier: "newDirectionCell", for: indexPath) as! DirectionRecipeTableViewCell
let directionCell = directions[indexPath.row]
cell.textLabel?.text = directionCell.directionSection
cell.detailTextLabel?.text = directionCell.directionText
}
return cell
}

Away from the problem the first line
var cell = UITableViewCell()
is actually what is being returned cells inside the if statements are local variables
So try this
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
if (tableView == self.ingredientTableView)
{
let cell = tableView.dequeueReusableCell(withIdentifier: "newIngredientCell", for: indexPath) as! IngredientRecipeTableViewCell
let ingredientCell = ingredients[indexPath.row]
cell.textLabel?.text = ingredientCell.titleIngredientRecipe
cell.detailTextLabel?.text = ingredientCell.subtitleIngredientRecipe
return cell
}
else
{
let cell = tableView.dequeueReusableCell(withIdentifier: "newDirectionCell", for: indexPath) as! DirectionRecipeTableViewCell //Thread 1: signal SIGABRT
let directionCell = directions[indexPath.row]
cell.textLabel?.text = directionCell.directionSection
cell.detailTextLabel?.text = directionCell.directionText
return cell
}
}
Also make sure that you register every tableview with the corresponding cell

error i so easy
you declare this
var cell = UITableViewCell()
then you create new one
let cell = tableView.dequeueReusableCell(withIdentifier: "newIngredientCell", for: indexPath) as! IngredientRecipeTableViewCell
just remove let
Also
In interface builder make sure that cell with newDirectionCell is DirectionRecipeTableViewCell and same for another cell
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
var cell = UITableViewCell()
if (tableView == self.ingredientTableView)
{
cell = tableView.dequeueReusableCell(withIdentifier: "newIngredientCell", for: indexPath) as! IngredientRecipeTableViewCell
let ingredientCell = ingredients[indexPath.row]
cell.textLabel?.text = ingredientCell.titleIngredientRecipe
cell.detailTextLabel?.text = ingredientCell.subtitleIngredientRecipe
}
else if (tableView == self.directionTableView)
{
//Thread 1: signal SIGABRT on next line
cell = tableView.dequeueReusableCell(withIdentifier: "newDirectionCell", for: indexPath) as! DirectionRecipeTableViewCell
let directionCell = directions[indexPath.row]
cell.textLabel?.text = directionCell.directionSection
cell.detailTextLabel?.text = directionCell.directionText
}
return cell
}

Swift: unable to dequeue a cell with identifier in tables with sections

In my iOS app I have a table with 4 sections. I created a subtitle cell for each section and each cell has got its own identifier as you can see from the screenshot:
The problem is that when I need to insert a cell in that section by creating it with its identifier, I get am exception saying 'unable to dequeue a cell with identifier ... '
Here's my method:
override func tableView(tableView: UITableView,
cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell:UITableViewCell?
var selectedStatus:String
switch indexPath.section {
case 0:
let cell = tableView.dequeueReusableCellWithIdentifier("OpenTasks",
forIndexPath: indexPath) as! UITableViewCell
selectedStatus = "Aperti"
break
case 1:
let cell = tableView.dequeueReusableCellWithIdentifier("ClosedTasks",
forIndexPath: indexPath) as! UITableViewCell
selectedStatus = "Chiusi"
break
case 2:
let cell = tableView.dequeueReusableCellWithIdentifier("ExpiredTasks",
forIndexPath: indexPath) as! UITableViewCell
selectedStatus = "Scaduti"
break
case 3:
let cell = tableView.dequeueReusableCellWithIdentifier("SuspendedTasks",
forIndexPath: indexPath) as! UITableViewCell
selectedStatus = "Sospesi"
break
default:
let cell = tableView.dequeueReusableCellWithIdentifier("",
forIndexPath: indexPath) as! UITableViewCell
selectedStatus = ""
break
}
let task = self.organizedTasks.items[selectedStatus]![indexPath.row]
cell?.textLabel?.text = task.titolo
cell?.detailTextLabel?.text = task.priorita
return cell!
}
I don't know what I am missing...
Can you help?

You are making mistake in you code by using let to every cell variable.
This is right way to do it:
override func tableView(tableView: UITableView,
cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell:UITableViewCell?
var selectedStatus:String
switch indexPath.section {
case 0:
cell = tableView.dequeueReusableCellWithIdentifier("OpenTasks",
forIndexPath: indexPath) as! UITableViewCell
selectedStatus = "Aperti"
break
case 1:
cell = tableView.dequeueReusableCellWithIdentifier("ClosedTasks",
forIndexPath: indexPath) as! UITableViewCell
selectedStatus = "Chiusi"
break
case 2:
cell = tableView.dequeueReusableCellWithIdentifier("ExpiredTasks",
forIndexPath: indexPath) as! UITableViewCell
selectedStatus = "Scaduti"
break
case 3:
cell = tableView.dequeueReusableCellWithIdentifier("SuspendedTasks",
forIndexPath: indexPath) as! UITableViewCell
selectedStatus = "Sospesi"
break
default:
cell = tableView.dequeueReusableCellWithIdentifier("",
forIndexPath: indexPath) as! UITableViewCell
selectedStatus = ""
break
}
let task = self.organizedTasks.items[selectedStatus]![indexPath.row]
cell?.textLabel?.text = task.titolo
cell?.detailTextLabel?.text = task.priorita
return cell!
}

Well first of all, This looks like a disaster of an approach to using a tableview.
Secondly, your first identifier in the screenshot is OpenTask (singular), but your code is looking for OpenTasks (plural).
Hope this helps

Poor Performance with multiple UICollectionViewCells in one CollectionVIew

I have a CollectionView with multiple cell types. When scrolling between different cell types performance can get very laggy. I'm not exactly sure how to fix it. Here's my cellForItemAtIndexPath:
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
if cellType == "imageCell" {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("iCell", forIndexPath: indexPath) as! ImageCell
//do things for cell
return cell
}else if cellType == "mapCell" {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("mCell", forIndexPath: indexPath) as! MapCollectionViewCell
//do things for cell
return cell
}else if cellType == "pCell" {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("pCell", forIndexPath: indexPath) as! PCell
//do things for cell
return cell
}else if cellType == "detailCell" {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("fCell", forIndexPath: indexPath) as! DetailCell
//do things for cell
return cell
}else{
return UICollectionViewCell()
}}

DisclosureIndicator not shown

i've created a UITableView and used the standard UITableViewCell and added a accessoryType, but whatever i do it does not seem to appear. How come is that? here is my code:
func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
switch indexPath.row
{
case 0:
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as UITableViewCell
cell.textLabel?.text = "Kontakt os"
cell.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator
return cell
case 1:
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as UITableViewCell
cell.textLabel?.text = "Privatpolitik"
cell.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator
return cell
case 2:
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as UITableViewCell
cell.textLabel?.text = "Vilkår"
cell.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator
return cell
default:
println()
}
return nil
}

Resources