How to Implement Touch Up Inside in touchesBegan, touchesEnded

Question

I'm wondering if someone knows how to implement the "touch up inside" response when a user pushes down then lifts their finger in the touchesBegan, touchesEnded methods. I know this can be done with UITapGestureRecognizer, but actually I'm trying to make it so that it only works on a quick tap (with UITapGestureRecognizer, if you hold your finger there for a long time, then lift, it still executes). Anyone know how to implement this?

Answer 1

Using the UILongPressGesturizer is actually a much better solution to mimic all of the functionality of a UIButton (touchUpInside, touchUpOutside, touchDown, etc.):

- (void) longPress:(UILongPressGestureRecognizer *)longPressGestureRecognizer
{
 if (longPressGestureRecognizer.state == UIGestureRecognizerStateBegan || longPressGestureRecognizer.state == UIGestureRecognizerStateChanged)
 {
 CGPoint touchedPoint = [longPressGestureRecognizer locationInView: self];
 if (CGRectContainsPoint(self.bounds, touchedPoint))
 {
 [self addHighlights];
 }
 else
 {
 [self removeHighlights];
 }
 }
 else if (longPressGestureRecognizer.state == UIGestureRecognizerStateEnded)
 {
 if (self.highlightView.superview)
 {
 [self removeHighlights];
 }
 CGPoint touchedPoint = [longPressGestureRecognizer locationInView: self];
 if (CGRectContainsPoint(self.bounds, touchedPoint))
 {
 if ([self.delegate respondsToSelector:@selector(buttonViewDidTouchUpInside:)])
 {
 [self.delegate buttonViewDidTouchUpInside:self];
 }
 }
 }
}

Answer 2

I'm not sure when it was added, but the property isTouchInside is a life saver for any UIControl derived object (e.g. UIButton).

override func endTracking(_ touch: UITouch?, with event: UIEvent?) {
 super.endTracking(touch, with: event)
 if isTouchInside {
 // Do the thing you want to do
 }
}

Here's the Apple official docs

Answer 3

You can implement touchesBegan and touchesEnded by creating a UIView subclass and implementing it there.

However you can also use a UILongPressGestureRecognizer and achieve the same results.

Answer 4

I did this by putting a timer that gets triggered in touchesBegan. If this timer is still running when touchesEnded gets called, then execute whatever code you wanted to. This gives the effect of touchUpInside.

 -(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
 {
 NSTimer *tapTimer = [[NSTimer scheduledTimerWithTimeInterval:.15 invocation:nil repeats:NO] retain];
 self.tapTimer = tapTimer;
 [tapTimer release];
 }
 -(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
 {
 if ([self.tapTimer isValid])
 {
 }
 }

• Chen Li Yong: This is really smart and easy to understand.

Answer 5

You can create some BOOL variable then in -touchesBegan check what view or whatever you need was touched and set this BOOL variable to YES. After that in -touchesEnded check if this variable is YES and your view or whatever you need was touched that will be your -touchUpInside. And of course set BOOL variable to NO after.

Answer 6

You can add a UTapGestureRecognizer and a UILongPressGestureRecognizer and add dependency using [tap requiresGestureRecognizerToFail:longPress]; (tap and long press being the objects of added recognizers).

This way, the tap will not be detected if long press is fired.