iOS keep keyboard open when tab a specific element - ios

Question

I have a UITextView and a Button.
I need that the keyboard stays opened when the user taps the button.
I tried to use the ShouldEndEditing function to return False, but then the user can never close the keyboard again.
Any ideas?
I'm using Xamrin Forms.

Answer 1

In Objective-C you would set a Done Editing event in the view controller, which would immediately re-open the keyboard.. with no visual change.
-(IBAction) textFieldDoneEditing : (id) sender{
[sender resignFirstResponder];
[sender becomeFirstResponder];
}
Xamarin / C# equivalent.. off the top of my head.
txtMyTextBox.Ended += (sender, e) =>
{
txtMyTextBox.ResignFirstResponder();
txtMyTextBox.BecomeFirstResponder();
};

Answer 2

Ah, interesting question and you have already known about the property "ShouldEndEditing" in UITextFieldDelegate, so why don't you try to implement a custom delegate for your UITextField?
I wrote a sample for you and I use a UISwitch to simulate the condition for hiding the keyboard, in your ViewController, use the code below:
public override void ViewDidLoad ()
{
MYTextFieldDelegate myDel = new MYTextFieldDelegate ();
UITextField textTF = new UITextField ();
textTF.Frame = new CoreGraphics.CGRect (50, 50, 200, 40);
textTF.BackgroundColor = UIColor.Red;
textTF.Delegate = myDel;
this.Add (textTF);
UIButton btnTest = new UIButton (UIButtonType.System);
btnTest.SetTitle ("Test", UIControlState.Normal);
btnTest.Frame = new CoreGraphics.CGRect (50, 100, 200, 40);
btnTest.TouchUpInside += delegate {
this.View.EndEditing (true);
};
this.Add (btnTest);
UISwitch keyboardSwitch = new UISwitch ();
keyboardSwitch.Frame = new CoreGraphics.CGRect (50, 150, 200, 40);
keyboardSwitch.ValueChanged += (sender, e) => {
bool flag = (sender as UISwitch).On;
myDel.FlagForDisplayKeyboard = flag;
};
this.Add (keyboardSwitch);
}
And this is MYTextFieldDelegate.cs:
class MYTextFieldDelegate : UITextFieldDelegate
{
public bool FlagForDisplayKeyboard { get; set; }
public override bool ShouldEndEditing (UITextField textField)
{
return FlagForDisplayKeyboard;
}
public MYTextFieldDelegate ()
{
FlagForDisplayKeyboard = false;
}
}
Hope it can help you.