I've been trying to get an alert message to pop up when a user touches "Start" to start a timer when any or all of the 3 required textfields are empty. No alert message pops up in the simulator.
@IBAction func start(_ sender: Any) {
//the following code produces an alert if any of the specified text fields are blank when the "start" button is pressed
if medName.text == nil || dose.text == nil || freq.text == nil {
let alertController = UIAlertController(title: "Field(s) must be filled in!", message: "Please complete all fields.", preferredStyle: UIAlertControllerStyle.alert)
alertController.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action)
in
self.dismiss(animated: true, completion: nil)}))
self.present(alertController, animated: true, completion: nil)
} else {
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(SecondViewController.decreaseTimer), userInfo: nil, repeats: true)
let itemsObject = UserDefaults.standard.object(forKey: "cellContent")
var cellContent:[String]
if let tempItems = itemsObject as? [String] {
cellContent = tempItems
cellContent.append(medName.text!)
} else {
cellContent = [medName.text!]
}
UserDefaults.standard.set(cellContent, forKey: "cellContent")
//the following code clears the text within each of the specified text fields when start is pressed
medName.text = ""
dose.text = ""
freq.text = ""
}
}
A text field is not nil when it´s empty and has no text, that´s why you don´t enter the if-statement. Do this check instead where you check if your text is "":
if medName.text == "" || dose.text == "" || freq.text == ""
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments