Does anyone have an official answer as to why some tableview cell lines disappear on scroll? Is this a glitch? I've seen some answers on how to remove them but what is causing this problem to begin with?
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.section == 0 {
let cell = tableView.dequeueReusableCell(withIdentifier: "DisplayHeader") as! DisplayTVC
return cell
} else {
let cell = tableView.dequeueReusableCell(withIdentifier: "PictureDisplay") as! PictureTVC
cell.collectionView.reloadData()
return cell
}
}
Related
I have tableview datasource func to build a cell from a factory method function.
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
return OWTableViewOrganizer.instance.configureCell(at: indexPath)!
}
The factory method is here:
func configureCell(at indexPath: IndexPath) -> UITableViewCell? {
var cell = UITableViewCell()
switch indexPath.section {
case thisWorkoutSections.barbel.sectionNumber():
cell = barebellCell(indexPath: indexPath)
break
case thisWorkoutSections.lastWorkout.sectionNumber():
cell = lastWorkoutCell(indexPath: indexPath)
break
case thisWorkoutSections.personalRecord.sectionNumber():
cell = personalRecordCell(indexPath: indexPath)
break
case thisWorkoutSections.notes.sectionNumber():
break
default:
break
}
return cell
}
I have this code to build the cell:
func lastWorkoutCell(indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: WorkoutSetTableViewCell.cellIdentifier(), for: indexPath) as! WorkoutSetTableViewCell
if OWTableViewOrganizer.instance.lastWorkoutExerciseSets.count > 0 {
if indexPath.row < OWTableViewOrganizer.instance.lastWorkoutExerciseSets.count {
let logExerciseSet = OWTableViewOrganizer.instance.lastWorkoutExerciseSets[indexPath.row]
let setNumber = indexPath.row + 1
if let weight = logExerciseSet.weight?.doubleValue, let reps = logExerciseSet.reps?.intValue {
cell.setupCellWithData(setNumber: setNumber, weight: weight, reps: reps)
}
} else {
cell.setupCellWithData(setNumber: -1, weight: 0, reps: 0)
}
} else {
cell.setupCellWithData(setNumber: -1, weight: 0, reps: 0)
}
return cell
}
But time to time this line crashes for me:
let cell = tableView.dequeueReusableCell(withIdentifier: WorkoutSetTableViewCell.cellIdentifier(), for: indexPath) as! WorkoutSetTableViewCell
With error:
Attempted to dequeue multiple cells for the same index path, which is not allowed. If you really need to dequeue more cells than the table view is requesting, use the -dequeueReusableCellWithIdentifier: method (without an index path)
I know code style and design is not ideal here, please skip this if you have comments.
I don't know where to look, I tried simply remove indexPath, but it looks does not help or bring even more issues:
let cell = tableView.dequeueReusableCell(withIdentifier: WorkoutSetTableViewCell.cellIdentifier()) as! WorkoutSetTableViewCell
I have one controller which presents another one at the top of it (like in Apple music) and I can swipe down to show bottom controller and swipe up to bring back top controller. I noticed in log that I have some presentation alert, not sure if this something I need to deal with to resolve the issue above but JFY info.
It seems like there are two table view trigger
tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath)
and you only dequeue cell from 1 table view at
let cell = tableView.dequeueReusableCell(withIdentifier: WorkoutSetTableViewCell.cellIdentifier(), for: indexPath) as! WorkoutSetTableViewCell
You should try to pass tableView from
tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath)
to
lastWorkoutCell(indexPath: IndexPath)
(which will become lastWorkoutCell(indexPath: IndexPath, tableView: UITableView)) and dequeue cell from tableView
When it comes to creating a dynamic type table view in a storyboard, it automatically fills up the table with rows.
How would i disable the red lined section (unused rows yet) of the image?
Use tableView(_:cellForRowAt:) method from UITableViewDataSource, like so
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CellId", for: indexPath)
if indexPath.section == DISABLED_SECTION_INDEX {
cell.isUserInteractionEnabled = false
} else {
cell.isUserInteractionEnabled = true
}
}
Or without if statement
cell.isUserInteractionEnabled = indexPath.section != DISABLED_SECTION_INDEX
I populated a tableView with an array of dictionaries Now How can I save the cell contents to Core Data and retrieve it in another tableView ?
I loaded an array of dictionaries to a tableView:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! SourceTableViewCell
cell.titleLabel.text = sourceFeeds[indexPath.row]["title"]
cell.linkLabel.text = sourceFeeds[indexPath.row]["link"]
return cell
}
Now I want to save those link and title to core data in cell selection
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.tableView.deselectRow(at: indexPath, animated: true)
let cell = self.tableView.cellForRow(at: indexPath) as! SourceTableViewCell
if self.tableView.cellForRow(at: indexPath)?.accessoryType == UITableViewCellAccessoryType.none {
self.tableView.cellForRow(at: indexPath)?.accessoryType = UITableViewCellAccessoryType.checkmark
} else {
self.tableView.cellForRow(at: indexPath)?.accessoryType = UITableViewCellAccessoryType.none
}
}
I want to mention that "sourceFeeds" array has loaded from plist!
I found the solution of my problem finally!
I'm trying to show checkmark on tableview cell, but the checkmark appears only sometimes and it disappears when I scroll.
Below the code:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCellWithIdentifier("vvxxx12", forIndexPath: indexPath)
// Configure the cell...
cell.textLabel?.text = self.dataArray[indexPath.row] as? String //in dataArray values are stored
if dataArray.containsObject(indexPath)
{
cell.accessoryType = .Checkmark
}
else {
cell.accessoryType = .None
}
return cell
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
if let cell = tableView.cellForRowAtIndexPath(indexPath) {
if cell.accessoryType == .Checkmark {
cell.accessoryType = .None
} else {
cell.accessoryType = .Checkmark
}
}
}
Just do following changes in your code to maintain checkmark into tableview while you are scrolling tableview
Result :
Its work fine now, Any problem let me know i will definitely help you to out.Enjoy..
For Swift 3 following worked for me to
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
yourtableView.cellForRow(at: indexPath as IndexPath)?.accessoryType = .checkmark
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
yourtableView.cellForRow(at: indexPath as IndexPath)?.accessoryType = .none
}
cell.textLabel?.text = self.dataArray[indexPath.row] as? String
This suggests that dataArray contains strings.
if dataArray.containsObject(indexPath)
This suggests that dataArray contains index paths. Both of these should not be true. One array for data makes sense, and another one for selected rows or rows to be checked also makes sense, but not the same array for both.
What's probably happening is:
Row selected - cell is then updated to have the checkmark accessory
Table scrolled and cellForRowAtIndexPath is called - at no point will dataArray contain an index path, so the accessory is always cleared.
You need to be updating your model when a row is selected, to store the index path of the selected row, or update a selected flag on your model objects.
I have a tableView with two different custom cell. One cell have a switch and other a image, I have Two separated custom class for the cells, identifiers.. but I can't see this. i don't know if I need change the configuration in story board to dynamic or other thing.. Can I show two different custom cells
Thanks!
Check the criteria for showing each specific custom cell, then cast to that cell as needed:
override func tableView(tableView: UITableView?, cellForRowAtIndexPath indexPath: NSIndexPath?) -> UITableViewCell? {
if (criteria for cell 1) {
let cell = tableView!.dequeueReusableCellWithIdentifier("cell1", forIndexPath: indexPath) as? Cell1
return (cell)
}
else {
let cell = tableView!.dequeueReusableCellWithIdentifier("cell2", forIndexPath: indexPath) as? Cell2
return (cell)
}
}
Swift 3
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath -> UITableViewCell {
if (criteria for cell 1) {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell1", for: indexPath) as! Cell1
return cell
}
else {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell2", for: indexPath) as! Cell2
return cell
}
}
override func tableView(tableView: UITableView?,cellForRowAtIndexPath indexPath: NSIndexPath?) -> UITableViewCell? {
if (...) {
let cell : Mycell1 = tableView!.dequeueReusableCellWithIdentifier("Mycell1", forIndexPath: indexPath) as? Mycell1
return cell
}
else {
let cell : Mycell2 = tableView!.dequeueReusableCellWithIdentifier("Mycell2", forIndexPath: indexPath) as? Mycell2
return cell
}
}