CODEWITHSUNDEEP
iosswift
Walter West
Walter West

Reputation: 859

Can't get cell by cellForRowAtIndexPath

I need enable edit textfield when edit mode for UITableView enabled. It works fine:

override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) ->
    Bool {
        if (self.tableView.editing)
        {
                let cell = tableView.cellForRowAtIndexPath(indexPath) as TestTableViewCell
                cell.testTextField.enabled=true
                cell.showsReorderControl = true
                return true
        }
        else{
            return false
        }
    }

When edit mode off, textfield steel editable. I add code to else for fix it:

 else{
    let cell2 = self.tableView.cellForRowAtIndexPath(indexPath) as TestTableViewCell
                cell2.testTextField.enabled=false
            return false
        }

But I get error "fatal error: unexpectedly found nil while unwrapping an Optional value" on this line

let cell2 = self.tableView.cellForRowAtIndexPath(indexPath) as TestTableViewCell

Upvotes: 3

Views: 1103

Answers (2)

Hail Zhang
Hail Zhang

Reputation: 239

From what error Xcode given, you need to check the data type. 

else{
let cell2 = self.tableView.cellForRowAtIndexPath(indexPath) as? TestTableViewCell
            cell2?.testTextField.enabled=false
        return false
    }

Add '?' after 'as' will have a condition check, and add another '?' to set attribute only when it is not nil.

This is a very common problem when programming with Optional value. Hope this can help.

Upvotes: 1

Wain
Wain

Reputation: 119031

cellForRowAtIndexPath will only return a cell if it is actually loaded, i.e. actually visible. Any rows that aren't visible don't have loaded cells.

So, you should check visibility and check the editing status in the cell creation / appearance / disappearance delegate methods so that you can set the appropriate state onto the cells.

Upvotes: 3

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