getting value from uitextfield in uitableview - ios

Question

i have a lot of uitableviewcells with uitextfields inside. And i am catching the editing of the user with the delegate of the textField. That works fine as long as i don't use sections. Because i use the tag of the textField to save the indexPath.row of the cell. The problem is that i have to use sections now and with the sections i would have to save the indexPath.row and .section somehow.
Here is some Code.
func textFieldDidEndEditing(textField: UITextField) {
let indexPath = NSIndexPath(forRow: textField.tag, inSection: 0)
let cell : UITableViewCell? = self.tableView.cellForRowAtIndexPath(indexPath) as UITableViewCell?
if data[(cell?.contentView.viewWithTag(textField.tag + 10000) as! UILabel).text!] != textField.text {
newData[fields[indexPath.row].ID] = textField.text
}
print((cell?.contentView.viewWithTag(textField.tag + 10000) as! UILabel).text)
print(textField.text)
}
Is there a better way to catch the edit of the textfields? Or how could i save both informations in the tag of the textfield?
greetings Adarkas.

Answer 1

Lets take a different approach.
Instead of using tag, you could convert your textfield location and get the index path of its cell superview.
func textFieldDidEndEditing(textField: UITextField) {
let origin: CGPoint = textField.frame.origin
let point: CGPoint = textField.convertPoint(origin, toView: self.tableView)
let indexPath = self.tableView.indexPathForRowAtPoint(point)
let cell : UITableViewCell? = self.tableView.cellForRowAtIndexPath(indexPath) as UITableViewCell?
if data[(cell?.contentView.viewWithTag(textField.tag + 10000) as! UILabel).text!] != textField.text {
newData[fields[indexPath.row].ID] = textField.text
}
print((cell?.contentView.viewWithTag(textField.tag + 10000) as! UILabel).text)
print(textField.text)
}

Answer 2

I don't remember where on SO I saw this to give proper credit, but here's what I'm using in my app. You get the indexPath based on the textField's superview.
let textField = sender as! UITextField
let view = textField.superview!.superview!
let currentCell = view.superview as! UITableViewCell // Or substitute your custom cell class name
let indexPath = tableView.indexPathForCell(currentCell)

Answer 3

I have resolved my problem like follows.
I have created a unique ID for my Datasource and i use that to determine with cell has been updated.
var row = 0
var section = 0
for var k = 0; k < fieldsWSections.count; k++ {
for var kk = 0; kk < fieldsWSections[k].count; kk++ {
if fieldsWSections[k][kk].ID == String(textField.tag) {
section = k
row = kk
}
}
}
if data[fieldsWSections[section][row].name] != textField.text {
newData[fieldsWSections[section][row].ID] = textField.text
}
So i don't need to know the indexPath anymore.

Answer 4

Using tags is a bad idea for reusable code, but the other answers rely upon a precise structure of the hierarchy.
This helper function only expects that the UITextField is a child of the UITableViewCell and that the UITableViewCell is a child of the their UITableView, which should always be true when the UITextFieldDelegate is called. If either is not true, this returns nil.
func indexPath(for view: UIView) -> IndexPath? {
// find the cell
var sv = view.superview
while !(sv is UITableViewCell) {
guard sv != nil else { return nil }
sv = sv?.superview
}
let cell = sv as! UITableViewCell
// find the owning tableView
while !(sv is UITableView) {
guard sv != nil else { return nil }
sv = sv?.superview
}
let tableView = sv as! UITableView
// locate and return the indexPath for the cell in this table
return tableView.indexPath(for: cell)
}