Question

I’m catching touch events. I need to differentiate two events
1) User touched a screen and then lifted a finger
2) User touched screen and don’t lifted a finger
How can I differentiate two events?

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
 if (isFirstCase)
 {}
 if (isSecondCase)
 {}
}

Answer 1

Attribute (NSSet *)touches contains UITouch objects each of them contain several helpful properties:

@property(nonatomic, readonly) NSUInteger tapCount
@property(nonatomic, readonly) NSTimeInterval timestamp
@property(nonatomic, readonly) UITouchPhase phase
@property(nonatomic,readonly,copy) NSArray *gestureRecognizers

typedef enum {
    UITouchPhaseBegan,
    UITouchPhaseMoved,
    UITouchPhaseStationary,
    UITouchPhaseEnded,
    UITouchPhaseCancelled,
} UITouchPhase;

Phase and tapCount is very usable property to identify the type of touch.
Check if you can use UIGestureRecognizers. NSArray *gestureRecognizers – the array of this objects which related to this particular touch.

Have a nice day 🙂