How to limit text in textfield when entered text through speech - ios

Question

I am having 3 textfields and I have restricted character limit to 50 for each textfield using UITextFeildDelegate method and it is working fine. Now when I try to input text through speech and not by keyboard then the textfield seems to accept more than 50 characters and some time the whole text disappear when the speech input is completed.
Here is my delegate method shouldChangeCharactersInRange
if(textField==self.optionATextField || textField==self.optionBTextField ||textField==self.optionCTextField) {
if(range.length + range.location > textField.text.length) {
return NO;
}
NSUInteger newLength = [textField.text length] + [string length] - range.length;
return newLength <= 50;
}
Is there any way to do it? Do I need to implement any other method for speech input to work properly.
Hope you understand the problem.
Thanks in advance

Answer 1

shouldChangeCharactersInRange , override method won't be called when user is using dictation(Speech To Text) function.
What you can do is,(This example is on C#(Xamarin iOS))
1.Use :
textField.EditingChanged += textField_EditingChanged;
2.Inside the below method implement following,
maxLength: Max length for searchBar textfield
private void textField_EditingChanged(object sender, EventArgs e)
{
var textField = sender as UITextField;
var maxLengthSubstractionValue = textField.Text.Length.CompareTo(maxLength);
if(maxLengthSubstractionValue == 1)
{
textField.Text = textField.Text.Substring(0, Math.Min(maxLength, textField.Text.Length));
}
}

Answer 2

To implement the functionality, you have to use textViewDidChange delegate method.
- (void)textViewDidChange:(UITextView *)textView {
if (textView.text.length > kMaxCharAllowed) {
textView.text = [textView.text substringToIndex:kMaxCharAllowed];
}
}
This method will be called whenever there is a change in text field string. We replace the text with a string of the desired length if the text is lengthier than desired.
Along with this, use - (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text method to handle the keyboard inputs.

Answer 3

Assuming you want the entered text to be truncated to a maximum of 50 characters regardless of the method of entry, you can do something like this:
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if(textField==self.optionATextField || textField==self.optionBTextField ||textField==self.optionCTextField) {
NSString *newText = [textField.text stringByReplacingCharactersInRange:range withString:string];
if (newText.length < 50) {
// Text length is still OK, let it through
return YES;
} else {
// The new text is too long - truncate and set the shorter value
newText = [newText substringToIndex:50];
textField.text = newText;
return NO;
}
} else {
return YES; // do whatever you need here
}
}