CODEWITHSUNDEEP
c#xamarin.iosuibuttonxamarintouch-up-inside
Patrick Simard
Patrick Simard

Reputation: 113

Monotouch TouchUpInside does not work, TouchDown works

I have seen some topics about this subject in Objective-C. I read a lot of them, spent 2 days on it on trying to find a solution and none of them worked for me. I am mainly coding in C#. Since my problem behaviour (fire only when leaving/re-enter button) and context (C#) is a bit different. So, I will try my chance by asking my question here.

I will try to keep it simple.

Here is a sample of code:

private UIButton _buttonTest;

public override void ViewDidLoad ()
{
    base.ViewDidLoad ();

    _buttonTest = new UIButton(new RectangleF(10, 70, 50, 50));
    _buttonTest.SetTitle("0", UIControlState.Normal);
    _buttonTest.TouchUpInside += HandleButtonTestTouchUpInside;
    _buttonTest.BackgroundColor = UIColor.Red;
    this.View.AddSubview(_buttonTest);
}

void HandleButtonTestTouchUpInside (object sender, EventArgs e)
{
    string textNumber = _buttonTest.Title(UIControlState.Normal);

    // Increment Number
    _buttonTest.SetTitle((int.Parse(textNumber)+1).ToString(), UIControlState.Normal);
}

This code usually works very well!

However, it does not work in some of my classes for some unknown reasons...

Here is the problem:

Things Checked:

Any suggestion?

Upvotes: 3

Views: 3794

Answers (2)

Bjarke
Bjarke

Reputation: 1295

I had a similar problem, I ended up using a tap recognizer together with the long press recognizer like this for the button TopRightButton.

     var longPressGesture = new UILongPressGestureRecognizer(Action);
            TopRightButton.AddGestureRecognizer(longPressGesture);

            var tapRecognizer = new UITapGestureRecognizer();

            tapRecognizer.AddTarget(() =>
                                    {
            //method
            });

            tapRecognizer.NumberOfTapsRequired = 1;

            this.TopRightButton.AddGestureRecognizer(tapRecognizer); 
private void Action(){  };

Upvotes: 0

Patrick Simard
Patrick Simard

Reputation: 113

In the SuperSuperView, I had this tap gesture that was entering in conflict with the Button event.

    // Tap Gesture
    UITapGestureRecognizer tapPageGestureRecognizer = new UITapGestureRecognizer();
    tapPageGestureRecognizer.AddTarget(this, new Selector ("HandleTapPageGestureRecognizer:"));         
    this.View.AddGestureRecognizer(tapPageGestureRecognizer);

The idea is to disable the gesture SuperSuperView gesture when the button event, TouchDown was fired, ... and to re-enable it when the TouchUpInside is fired.

So here is one solution for the problem:

private void SetGrandParentViewGestureEnabled(bool enabled)
{
    foreach(UIGestureRecognizer g in this.View.Superview.Superview.GestureRecognizers)
    {
        g.Enabled = enabled;
    }
}

void HandleButtonSubmitTouchDown (object sender, EventArgs e)
{
    SetGrandParentViewGestureEnabled(false);
}

void HandleButtonSubmitTouchUpInside (object sender, EventArgs e)
{
    // => Do treatments here!

    SetGrandParentViewGestureEnabled(true);
}

However, I could have used EventHandler or Action to enable/disable the tap gesture.

EDIT: Here is another function that need to be added as well to re-enable the gesture.

void HandleButtonSubmitTouchUpOutside (object sender, EventArgs e)
{
    SetGrandParentViewGestureEnabled(true);
}

Upvotes: 2

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