gistfile1.m

- (void)pannedCell:(UIPanGestureRecognizer *)recognizer {
  if (recognizer.state == UIGestureRecognizerStateBegan) {
		_firstTouchPoint = [recognizer translationInView:self];
	}
	else if (recognizer.state == UIGestureRecognizerStateChanged) {
		CGPoint touchPoint = [recognizer translationInView:self];
		
		// Holds the value of how far away (horizontally) from the original resting position the cell has moved
		CGFloat xPos;
		
		// If the first touch point is left of the current point, it means the user is moving his/her finger right and the cell must move right
		if (_firstTouchPoint.x < touchPoint.x) {
			xPos = touchPoint.x - _firstTouchPoint.x;
			
			if (xPos <= 0) {
				xPos = 0;
			}
		}
		// User's moving his/her finger left and cell moves left
		else {
			xPos = -(_firstTouchPoint.x - touchPoint.x);
			
			if (xPos >= 0) {
				xPos = 0;
			}
		}
		
		// Only allow the cell to be moved 100 pixels left or right
		if (xPos <= 100 && xPos >= -100) {
			// Move our cell to the xPos we defined
			CGRect slidingViewFrame = self.slidingView.frame;
			slidingViewFrame.origin = CGPointMake(xPos - 100, 0);
			self.slidingView.frame = slidingViewFrame;
			
			if (xPos >= 80) {
				if (_removeIconIsActive == NO) {
					// Change remove icon to a red, active state and animate the change
					self.removeIconImageView.image = [UIImage imageNamed:@"remove-icon-active.png"];

//					[UIView animateWithDuration:0.1
//										  delay:0.0
//										options:UIViewAnimationOptionCurveEaseInOut
//									 animations:^{
//										 self.removeIconImageView.transform = CGAffineTransformMakeScale(1.3, 1.3);
//										 self.removeIconImageView.image = [UIImage imageNamed:@"remove-icon-active.png"];
//										 self.removeIconImageView.transform = CGAffineTransformMakeScale(1.0, 1.0);
//									 }
//									 completion:nil
//					 ];
					_removeIconIsActive = YES;
				}
				
				CGRect removeIconFrame = self.removeIconImageView.frame;
				removeIconFrame.origin = CGPointMake(40, 35);
				self.removeIconImageView.frame = removeIconFrame;
			}
			else if (xPos < 80) {
				if (_removeIconIsActive == YES) {
					// Change back to inactive state
					self.removeIconImageView.image = [UIImage imageNamed:@"remove-icon-inactive.png"];
					_removeIconIsActive = NO;
				}
				
				CGRect removeIconFrame = self.removeIconImageView.frame;
				removeIconFrame.origin = CGPointMake(xPos - 40, 35);
				self.removeIconImageView.frame = removeIconFrame;
			}
			
			if (xPos <= -80) {
				if (_checkIconIsActive == NO) {
					// Change check icon to a green, active state and animate the change
//					[UIView animateWithDuration:0.1
//										  delay:0.0
//										options:UIViewAnimationOptionCurveEaseInOut
//									 animations:^{
//										 self.checkIconImageView.transform = CGAffineTransformMakeScale(1.3, 1.3);
//										 self.checkIconImageView.image = [UIImage imageNamed:@"check-icon-active.png"];
//										 self.checkIconImageView.transform = CGAffineTransformMakeScale(1.0, 1.0);
//									 }
//									 completion:nil
//					];
					_checkIconIsActive = YES;
				}
				
				CGRect checkIconFrame = self.checkIconImageView.frame;
				checkIconFrame.origin = CGPointMake(270, 35);
				self.checkIconImageView.frame = checkIconFrame;
			}
			else if (xPos > -80) {
				if (_checkIconIsActive == YES) {
					// Change back to inactive state
					self.checkIconImageView.image = [UIImage imageNamed:@"check-icon-inactive.png"];
					_checkIconIsActive = NO;
				}
				
				CGRect checkIconFrame = self.checkIconImageView.frame;
				checkIconFrame.origin = CGPointMake(xPos + 350, 35);
				self.checkIconImageView.frame = checkIconFrame;
			}
		}
	}
	else if (recognizer.state == UIGestureRecognizerStateEnded) {
		[self springBack];
	}
	else if (recognizer.state == UIGestureRecognizerStateCancelled) {
		[self springBack];
	}
}