I have an AlertController with a text field and two button: CANCEL and SAVE. This is the code:
@IBAction func addTherapy(sender: AnyObject)
{
let addAlertView = UIAlertController(title: "New Prescription", message: "Insert a name for this prescription", preferredStyle: UIAlertControllerStyle.Alert)
addAlertView.addAction(UIAlertAction(title: "Cancel",
style: UIAlertActionStyle.Default,
handler: nil))
addAlertView.addAction(UIAlertAction(title: "Save",
style: UIAlertActionStyle.Default,
handler: nil))
addAlertView.addTextFieldWithConfigurationHandler({textField in textField.placeholder = "Title"})
self.presentViewController(addAlertView, animated: true, completion: nil)
}
What I want to do is implement a check on the textfield for disabling the SAVE button when the textfield is empty just like Pictures Application of iOS when you want create a NewAlbum. Please someone can explain me what to do?
There is a much simpler way without using notification center, in swift:
weak var actionToEnable : UIAlertAction?
func showAlert()
{
let titleStr = "title"
let messageStr = "message"
let alert = UIAlertController(title: titleStr, message: messageStr, preferredStyle: UIAlertControllerStyle.alert)
let placeholderStr = "placeholder"
alert.addTextField(configurationHandler: {(textField: UITextField) in
textField.placeholder = placeholderStr
textField.addTarget(self, action: #selector(self.textChanged(_:)), for: .editingChanged)
})
let cancel = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.cancel, handler: { (_) -> Void in
})
let action = UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: { (_) -> Void in
let textfield = alert.textFields!.first!
//Do what you want with the textfield!
})
alert.addAction(cancel)
alert.addAction(action)
self.actionToEnable = action
action.isEnabled = false
self.present(alert, animated: true, completion: nil)
}
func textChanged(_ sender:UITextField) {
self.actionToEnable?.isEnabled = (sender.text! == "Validation")
}