I'm quite new to Swift and couldn't find any good explanation for this. I want the user to select a duration (h:m:s) when clicking on a UITextField in an alert and display the value in the textField.
Can someone please give me a hint or an explanation.
UITextField has delegate protocol called UITextFieldDelegate
in your viewController:
func viewDidLoad() {
super.viewDidLoad()
yourTextField.delegate = self
}
Conform your viewController to this delegate. There is a textFieldShouldBeginEditing method, it is called when the user taps into the textfield. You return false here, so the textField won't became first responder and the keyboard will not open and you can present your picker.
extension viewController: UITextFieldDelegate {
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
//open your alert here
openPicker()
return false
}
}
You can use UIPickerView to present to the user. You can read about that here and even create it based on the example:
explanation and example of UIPickerView
Related
I'm learning Swift by making a times tables app, which simply creates random times tables and asks the user to type the answer in a UITextField.
I'd like the user to be able to tap the return key and have the text field clear their previous answer and have the keyboard remain in view. I've already set up the other behaviour I want, it's just I can't seem to find any similar questions to figure out how to clear, and do all this when there return key is tapped.
Here's the code I have so far, which works when dismissing the keyboard, and doesn't clear the field.
Many thanks!
#IBAction func answerTyped(_ sender: UITextField) {
/* Clear the text field*/
questionNumber += 1
attempted += 1
markQuestion(answer: answer)
newQuestion(awardLevel: currentLevel, questionNumber: questionNumber)
}
If you want the textField to be cleared on tapping return button you can use the textFieldShouldReturn delegate.
func textFieldShouldReturn(_ textField: UITextField) -> Bool { //delegate method
textField.text = "" // Clears text
//Do other things that you want to do when user taps return button
return true
}
Note that this wont dismiss the textField like how you asked and usually users are used to dismissing their textField using return. So if you ask me this is not good UX. And you need to have a mechanism for the user to dismiss the keyboard if needed like tap outside to dismiss or something. So i hope you have that sorted out.
Your viewController should have implemented the UITextFieldDelegate for this method work.
class YourViewController: UITextFieldDelegate {
var textField: UITextField! //Using IBOutlet or whatever
func viewDidLoad() {
super.viewDidLoad()
textField.delegate = self
}
}
you will need to make something, likely your view controller containing this text field into a uitextfieldelegate, then add the necessary delegate functions.
I think the function you want is TextField:DidEndEditing:Reason https://developer.apple.com/documentation/uikit/uitextfielddelegate/2352220-textfielddidendediting
Or you can just use
func textFieldShouldReturn(_ textField: UITextField) -> Bool { //delegate method
textField.resignFirstResponder()
return true
}
which is called every time user hits the return key. You would need to add your logic to clear the contents before the returns.
This question already has answers here:
Disable UITextField keyboard?
(10 answers)
Closed 4 years ago.
I am developing an app in which I want to open a view when the user clicks on a text field but I don't want to open the keyboard. How can I achieve this?
You can easily achieve it by setting an empty custom input view to the textField:
textField.inputView = UIView(frame: CGRect.zero)
Then the textField can become first responder normally, but this view (with zero frame) will be presented instead of the keyboard.
Set your ViewController as your TextFields delegate using
self.yourTextfield.delegate = self
and now implement the UITextFieldDelegate as shown below
extension ViewController : UITextFieldDelegate {
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
//Load your VC here
return false
}
}
Thats all :) Hope it helps
You can use below textField Delegate Method
func textFieldDidBeginEditing(_ textField: UITextField) {
yourTextField.resignFirstResponder()
//code for show view
}
Hope it will help!
You can simply add a tap gesture recognizer to the text field.
let tapGestRec = UITapGestureRecognizer(target: self, action: #selector(textFieldTapped))
textField.addGestureRecognizer(tapGestRec)
I'm trying to modify the text rendered in the UITextField based on certain events such as Touch Down or Touch Down Repeat. I want the UITextField to be responsive only to events but prevent users from modifying the actual value in the UITextField.
I have tried unchecking the Enabled state of the UITextField but that causes it to not respond to touch events either.
How do I prevent users from changing the contents of the UITextField without affecting the response to touch events, specifically using Swift 3?
So, I was finally able to get this working in the expected manner. What I did was -
1 - Extend the UITextFieldDelegate in the ViewController class
class ViewController: UIViewController, UITextFieldDelegate {
2 - Inside the function viewDidLoad(), assign the textfield delegate to the controller
override func viewDidLoad() {
super.viewDidLoad()
textfield.delegate = self
}
(you will have assign each UITextField's delegate that you want to be prevented from editing)
3 - Lastly, implement your custom behavior in the textFieldShouldBeginEditing function
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
return false
}
For reference, check out this API Reference on Apple Developer
Override textFieldShouldBeginEditing , and return false.
func textFieldShouldBeginEditing(state: UITextField) -> Bool {
return false
}
you can also disable for specific text field.
func textFieldShouldBeginEditing(textField: UITextField) -> Bool {
if(textField == self.myTextField){
return false
}
return true;
}
For simplicity, let's say I want to create a custom UITextField and I want to add a simple behaviour to it; Which is, if the textfield becomes the first responder, the background color would be changed to green.
To do so, in my custom class I have to set the class as the delegate to receive the event of becoming first responder. But the thing is that if the user of this custom textfield set itself as the delegate the events are not sent to the custom textfield(Since only one object can be the delegate of another object)
I can manually forward all the events, but I'm looking for a cleaner and more scalable solution.
Here's a sketch of the situation:
class MyTextField: UITextField {
override func awakeFromNib() {
super.awakeFromNib()
delegate = self
}
}
extension MyTextField: UITextFieldDelegate {
func textFieldDidBeginEditing(textField: UITextField) {
backgroundColor = UIColor.greenColor()
}
}
but if the user of MyTextField do this:
class ViewController: UIViewController {
#IBOutlet weak var myTextField: MyTextField!
override func viewDidLoad() {
super.viewDidLoad()
myTextField.delegate = self
}
}
the behaviour won't work; because the delegation relationship to MyTextField is gone.
NOTE: I'm not only interested in becoming first responder problem, rather it's about using any methods of the delegate, with capability of the user of my custom UITextField setting itself as the delegate, at the same time.
Thanks, in advance.
As you say, most delegation is restricted to a single object as the delegate.
Since a text field is a responder, you should be able to override func becomeFirstResponder() -> Bool to change the color, while letting the user of the object handle the delegation as it expects.
UIResponder docs: "Subclasses can override this method to update state or perform some action such as highlighting the selection."
I'm new in stackoverflow, I have a problem with new swift code.
I have custom the return button on keyboard with "Done", but when I tap on it, don't befall anything... How can I hide the keyboard on tap it?
I have added a code (found on this site) for hide the keyboard when you tap somewhere ,not in the keyboard, but I can't custom it with tap on "done" button... Thank you before!!
You need to implement delegate method which is called when you hit done button:
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
You also need to conform to UITextFieldDelegate protocol:
// I assume you override UIViewController class. If not add UITextFieldDelegate to your class
class MyViewController: UIViewController, UITextFieldDelegate
The last thing is set up your class to be a text field delegate:
textField.delegate = self
textField.delegate = self
can be replaced by
This will create the necessary connections between your View, its component and will make the textFieldShouldReturn method work as expected.
The protocol methods have new signatures (Swift 4.1). IE:
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
As the protocol methods are optional, using a wrong signature will silently fail.