How to handle when uitextview became first responder. I have text in text view and I want when the view became active want to clear the text. How can I do that? Thanks in advance
You can definitely use a UITextViewDelegate method of:
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView
Just return YES and intercept inside that method. You can also do it for UITextFields with UITextFieldDelegate and:
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
textViewShouldBeginEditing actually triggers before the text view becomes the first responder.
textViewDidBeginEditing will trigger once the text view becomes the first responder and would be the best place to execute code that needs to know what the active textview is.
If you are not really worried about which field is active and just want to clear the text once the field is tapped on you could use either function.
EDIT: The same methods are available for text fields.
As above, you can override becomeFirstResponder but note that you must call the superclass implementation. If you don't, things like popping the keyboard on a text field won't work. i.e.
override func becomeFirstResponder() -> Bool {
if super.becomeFirstResponder() {
// set up the control state
return true
}
return false
}
The Swift 4 solution
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
return true
}
Previous answers do the job great for UITextBox, but if you have a custom class derived from NSResponder and need to know when it becomes first responder:
-(BOOL) becomeFirstResponder
{
// Your stuff here
return YES;
}
Related
In my app I have a form where the user fills out his/her information, the form has some textfields and amongst those is one where the user can select their country. This textfiled is a dropdown which when active displays a dropdown (tableview) with the list of countries to select. I have created a demo project, to reproduce the issue and share it here.
In this demo, I have add 3 textfields, when the user goes to the second textfiled, using the next button on the keyboard, a tableview is displayed. Now what I want to achieve is my keyboard should hide when the dropdown tableview is displayed.
I have put in quite some time trying to figure this out but has no success.
Here is the link to the demo project:
https://github.com/tejaskutal/IQKeyboardManagerDemo
Any help is greatly appretiated.
P.S: For some weird reason, when you click next when the first textfiled is active, it jumps to the third one first and then goes to second textfield after next is clicked one more time. However, this has nothing to do with the original problem so I left it there.
No need to handle different delegate. In your viewDidload you can do something like,
yourTextField.inputView = UIView.init(frame: CGRect.zero)
yourTextField.inputAccessoryView = UIView.init(frame: CGRect.zero)
so, for that textfield keyboard or toolbar will not be appeared.
You can use your UITextField's delegate and implement the textFieldShouldBeginEditing. Something like
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
if textField == theTextFieldToIgnore {
view.endEditing(true)
return false
}
}
As for your textField chaining, you should implement the textFieldShouldReturn
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
if textField == firstOne {
textField.resignFirstResponder()
secondOne.becomeFirstResponder()
}
return true
}
Return key Action which textfield you want to resign
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[self.yourTf resignFirstResponder];
}
I am doing two operations on a textfield:
1) To move the textfield using pan gesture.
2) To write on the textfield when the user clicks on it.
Concern is that I want to perform one operation at a time i.e when the user is writing he cannot scroll and vice versa.
Name of UIButton action --- button
Name of UIButton outlet --- optionButton
- (IBAction)button:(id)sender
{
if([_optionButton.titleLabel.text isEqualToString:#"SCROLL"])
{
NSLog(#"can scroll");
NSLog(#"POINT=============%d ",point);
point=0;
[_optionButton setTitle:#"WRITE" forState:UIControlStateNormal];
textField1.enabled=NO;
}
else
{ NSLog(#"can write");
NSLog(#"POINT=============%d ",point);
point=1;
[_optionButton setTitle:#"SCROLL" forState:UIControlStateNormal];
textField1.enabled=YES;
}
}
The point variable is controlling the complete operation and is set to 1 at the beginning.This means that the user can write in the beginning and if he want to write he has to press the button.
The problem that I am facing is that by using "textField1.enabled=NO" I am not able to scroll the textfield.
Is there any function using which I can remove the focus from the textfield but can scroll it.
You can use this code to remove focus (As said in one of the comment),
[textField1 resignFirstResponder];
you can also remove focus from text field by calling [textField1 endEditing:YES]
An UITextfield only has 1 line, so you can´t scroll it.
UPDATE
If you want to move your UITextfield with your finger use UIPanGestureRecognizer in your parent view and apply the changes in your uitextfield.
You can simply follow the steps:
Implement UITextFieldDelegate into your Controller
class ClassName: UIViewController, UITextFieldDelegate {....}
Implement the "textFieldShouldBeginEditing" function
class ClassName: UIViewController, UITextFieldDelegate {
func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
return false
}
}
So returning false in textFieldShouldBeginEditing will simply not allow to edit into the UITextField.
I am doing an application and I need to detect when a UITextField is clicked. I tried using touchesBegan but it doesn't react to textfield when clicked, only outside of it. I am only starting with Objective-C so if you give me advice, please let it be detailed. Thank you.
You can try the delegate method:
- (void)textFieldDidBeginEditing:(UITextField *)textField {
// Do something
}
As long as the text field has interaction enabled and is editable. However, a second tap will not be detected if the text field is already the first responder.
Set the textview's delegate property to an object that overloads the textViewShouldBeginEditing: function. You could also use the textFieldDidBeginEditing: function of the same delegate.
I've got 2 UITextFields. I can detect when the user in inside either of them with:
textFieldDidBeginEditing:(UITextField *)textField
Which works great. But i want the textfields to animate out when the user is not inside either of them. Currently I'm calling: (void)textFieldDidEndEditing:(UITextField *)textField
However, this is called even if i switch from on textfield to the other. Is there a better way to call do this?
What I would do is add a BOOL flag to detect if you should animate out your text fields or not. It would work something like this:
-(void)hideTextFields {
if (self.shouldHideTextFields) {
self.textField1.hidden = YES; // Or whatever you want to do with
self.textField2.hidden = YES; // your text fields
}
}
Declare a method that checks the BOOL flag and decides whether to hide or not the text fields
Whenever either of the textFieldDidBeginEditing:(UITextField *)textField methods are called set the BOOL flag (you can call it 'shouldHideTextFields') to NO.
Whenever either of the textFieldDidEndEditing:(UITextField *)textField methods are called set the BOOL flag to 'YES'. Also, call [self performSelector:#selector(hideTextFields) withObject:nil afterDelay:1]; to give the user a little time to select the other text field. If he/she does, the flag will be set to NO thanks to the above step.
Hope this helps!
On didend check if either of your textviews is currently the first responder with [textfield isFirstResponder] or [textfield isEditing]. There may be a slight delay when one ends and the other takes control. If that's the case then you could do this check after a slight delay using performSelector:afterDelay.
On textFieldDidEndEditing delegate method, do not just perform your disappearing animations, but do that in dispatch_async, checking if there is no textField editing right now.
In case if user just ended editing of one text field, there will be no editing textfield. But if user had switched to another textfield, it will already start editing and it can be easily checked by isFirstResponder method.
The apple docs offer:
Asks the delegate if the text field should process the pressing of the
return button.
- (BOOL)textFieldShouldReturn:(UITextField *)textField
Parameters textField The text field whose return button was pressed.
Return Value YES if the text field should implement its default
behavior for the return button; otherwise, NO.
Discussion The text field callsthis method whenever the user tapsthe
return button. You can use this method to implement any custom
behavior when the button is tapped.
My question is what does the return value do? I have been implementing the behavior in this method so it makes no difference what is returned. Is this not the correct method to perform the action?
For instance, if I implement a search function, should I trigger the search action in this method or somewhere else.
This is the correct method to trigger an action when the user taps the Return keyboard key (whatever it happens to be labeled).
The return value from the textFieldShouldReturn: delegate method almost never matters. If you are dealing with a single text field then it definitely doesn't matter.
I ran into one issue a while back that made me realize that just under the right situation, the return value does matter. I had a screen with several text fields and then a text view. I was using this text field delegate method to change the first responder from text field to text field to text view. I found that if I returned YES in this delegate method and then made the text view the first responder, the newline was being sent to the text view.
As a result of this, I now always return NO from this delegate method to be safe.
When you press the return button on the keyboard the textFieldShouldReturn is called.
I never experienced any difference between the return value.
Customization example:
If you have two textFields when the user presses return button from first textField, you can give focus to second field in the following way:
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
NSLog(#"textFieldShouldReturn:");
if (textField.tag == 1)
{
UITextField *passwordTextField = (UITextField *)[self.view viewWithTag:2];
[passwordTextField becomeFirstResponder];
}
else
{
[textField resignFirstResponder];
}
return YES;
}
So you can use this delegate method for triggering search functionality.