gistfile1.txt

NSDictionary *viewsDict = NSDictionaryOfVariableBindings(_viewToAnimate);
  	NSLayoutConstraint *animationConstraint = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-(3)-[_viewToAnimate]" options:0 metrics:nil views:viewsDict][0];
		[self.containerView removeConstraint:self.leftEdgeConstraint];
		[self.containerView addConstraint:animationConstraint];  

[UIView animateWithDuration:0.3 animations:^{
		[self.view layoutIfNeeded];
	} completion:^(BOOL finished) {
		;
	}];

*OR*

  [self.buttonXAlignmentConstraint setConstant:115.0];
	[UIView animateWithDuration:0.3 animations:^{
		[self.view layoutIfNeeded];
	}];