CODEWITHSUNDEEP
iosswiftuitableviewuibuttonuicontrolstate
Gama
Gama

Reputation: 384

UITableViewCell does not hold the state of custom button

I have read through similar questions but I haven't been able to solve it. I have a tableview which has a custom cell with a button to add and remove a class. I created a custom delegate to save and remove the class, and to change the state of the button. Changing the state of the button works fine, but when I'm scrolling the buttons don't hold the state (I'm guessing is because I'm dequeuing the cells)

in my cell for row at index path i tried checking to change the state of the button:

let isInSchedule = self.isClassScheduled(classAttend, from: self.classesInSchedule!)
    if isInSchedule == true {
        cell.addRemoveButton.selected = true

    } else {
        cell.addRemoveButton.selected = false
    }

and here is my delegate method where I save or remove the class

 func indexOfClassSelectedWithButton(index: NSIndexPath, tableView:UITableView, and button: AddRemoveClass) {
    if let currentlySavedClasses = ManagedObjectsController.sharedInstance.getAllScheduledClasses() as? [ClassScheduled] {
    let classSelected = self.classes[index.section]
    switch button.selected {
    case true:
            for classItem in currentlySavedClasses {
                if classSelected.presentation?.title == classItem.presentation?.valueForKey("title") as? String {
                    ManagedObjectsController.sharedInstance.deleteScheduledClass(classItem)
                    button.selected = false
                }
            }
        break
    default:
        if let classSelectedBreakout = classSelected.breakout?.valueForKey("breakoutID") as? String {
            let canSave = self.isBreakoutAvailable(classSelectedBreakout, allClasses: currentlySavedClasses)
            if canSave {
                ManagedObjectsController.sharedInstance.createScheduledClass(from: classSelected)
                button.selected = true
            } else {
                NSNotificationCenter.defaultCenter().postNotificationName(timeConlictNotication, object: nil)
            }
        }
      break
    }
    }
}

it changes the button state but when I start scrolling up or down the buttons don't hold the state (I'm aware is probably because I'm revising my cell so it is taking any cell that it is available. Any help is greatly appreciated.

Also, I have my cell within my view controller in story board. Why is is that if i do cell = PresentationCell() all of the views in my cell are nil? Im just trying to not reuse the cell as my last solution.

Upvotes: 1

Views: 2419

Answers (3)

Gama
Gama

Reputation: 384

The solution came from @Michael " any state you need must be maintained outside of the cell" since the tableView reuses the cells that are already created I had to add a property to the class Im populating the tableview with (I used a bool but it can be anything) and based on that property I set the state of the button in the method cellForRowAtIndexPath.

Upvotes: 0

habs93
habs93

Reputation: 105

You should be doing two things

  1. Override "prepareForReuse" in your UITableViewCell subclass to reset the tableview cell to some default state
  2. in tableView:cellForRowAtIndexPath: will dequeu a re-usable cell. Since that cell is being re-used and may have already been associated with a different indexPath you have to re-configure it. In your case, you would set the state of the button to reflect the indexPath you are about to assign the cell to

Upvotes: 0

HSG
HSG

Reputation: 1224

Reusable table view cells do not keep the state so that to keep the button hold it's states you have to do an another check based on your condition when the cell will appear on the screen. My suggestion is implement 

func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {
if isInSchedule == true {
    cell.addRemoveButton.selected = true

} else {
    cell.addRemoveButton.selected = false
}

}

Another thing is remembering reset states of cell before using by implement "prepareForReuse" in your custom cell.

override func prepareForReuse() {

}

I hope this would be help.

Upvotes: 3

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