CODEWITHSUNDEEP
iosobjective-c
Kyle
Kyle

Reputation: 25

Simultaneous Button Press

I am trying to build an app where two buttons need to be pressed simultaneously.

if (self->button1.touchInside && self->button2.touchInside) {
    NSLog(@"Two buttons pressed");
    }
else if (!self->button1.touchInside | !self->button2.touchInside){
    NSLog(@"One button pressed");
    }

Both buttons are attached to the View Controller using the 'Touch Down' gesture option. When I press both buttons at the same time (with one press) the console window prints:

One button pressed
Two buttons pressed

This interferes with how my application works. I only want the console to print 

Two buttons pressed

Thanks

Upvotes: 0

Views: 327

Answers (2)

Deepti
Deepti

Reputation: 51

What i understand is you need to take some action when both the buttons are pressed. Watever you try, there is going to be a lag between the touches of these buttons. A better approach would be to check if press on both buttons is finished. Hope following works for you -

    @property(nonatomic, assign) BOOL firstButtonPressed;

    @property(nonatomic, assign) BOOL secondButtonPressed;

    //in init or viewDidLoad or any view delegates
       _firstButtonPressed = NO;
        _secondButtonPressed = NO;

    //Connect following IBActions to Touch Down events of both buttons
    - (IBAction)firstButtonPressed:(UIButton *)sender {
         _firstButtonPressed = YES;
          [self checkForButtonPress]; 
    }

    - (IBAction)secondButtonPressed:(UIButton *)sender {
         _ secondButtonPressed = YES; 
         [self checkForButtonPress];    
    }

    - (void)checkForButtonPress {
        if (_firstButtonPressed && _secondButtonPressed) {
            NSlog(@"Two buttons pressed");
        }
    }

Upvotes: 1

Rafał Sroka
Rafał Sroka

Reputation: 40030

You can do it using two boolean flags like this:

@property(nonatomic, assign) BOOL firstButtonPressed;
@property(nonatomic, assign) BOOL secondButtonPressed;

- (void)firstButtonTouchDown:(id)sender
{
    _firstButtonPressed = YES;

    if (_secondButtonPressed)
    {
        // Both buttons pressed.
    }
}


- (void)secondButtonTouchDown:(id)sender
{
    _secondButtonPressed = YES;

    if (_firstButtonPressed)
    {
        // Both buttons pressed.
    }
}


- (void)firstButtonTouchCancelled:(id)sender
{
    _firstButtonPressed = NO;
}


- (void)secondButtonTouchCancelled:(id)sender
{
    _secondButtonPressed = NO;
}

Alternatively, you can also start a timer when a touch is down and check if the second touch happens during time interval you specify.

Upvotes: 0

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