objective c - guide - UIScrollview obteniendo eventos táctiles

ios frameworks

Question

¿Cómo puedo detectar puntos de contacto en mi UIScrollView ? Los métodos delegados toques no están funcionando.

Answer 1

Configurar un reconocedor de gestos táctiles:

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapGestureCaptured:)];
[scrollView addGestureRecognizer:singleTap];

y obtendrás los toques en:

- (void)singleTapGestureCaptured:(UITapGestureRecognizer *)gesture
{
CGPoint touchPoint=[gesture locationInView:scrollView];
}

Answer 2

Puede crear su propia subclase UIScrollview y luego puede implementar lo siguiente:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
NSLog(@"DEBUG: Touches began" );
UITouch *touch = [[event allTouches] anyObject];
[super touchesBegan:touches withEvent:event];
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
NSLog(@"DEBUG: Touches cancelled");
// Will be called if something happens - like the phone rings
UITouch *touch = [[event allTouches] anyObject];
[super touchesCancelled:touches withEvent:event];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
NSLog(@"DEBUG: Touches moved" );
UITouch *touch = [[event allTouches] anyObject];
[super touchesMoved:touches withEvent:event];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
NSLog(@"DEBUG: Touches ending" );
//Get all the touches.
NSSet *allTouches = [event allTouches];
//Number of touches on the screen
switch ([allTouches count])
{
case 1:
{
//Get the first touch.
UITouch *touch = [[allTouches allObjects] objectAtIndex:0];
switch([touch tapCount])
{
case 1://Single tap
break;
case 2://Double tap.
break;
}
}
break;
}
[super touchesEnded:touches withEvent:event];
}

Answer 3

Si estamos hablando de los puntos dentro de la vista de desplazamiento, entonces puedes enlazar con el método de delegado:

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView

y dentro del método, lea la propiedad:

@property(nonatomic) CGPoint contentOffset

desde scrollView para obtener la coordinación.