Adding UIButton To UITableView Programmatically Wrong Spot - ios

Question

I'm trying to get a UIButton added to a TableView, where it sits in the bottom right corner of the table view, 20 from the right edge, and 20 from the bottom. However, it ends up sticking the button at the top left edge. What am I doing wrong?
UIButton *goToTop = [UIButton buttonWithType:UIButtonTypeCustom];
[goToTop setImage:redGo forState:UIControlStateNormal];
[goToTop addTarget:self action:#selector(beginCampaign) forControlEvents:UIControlEventTouchUpInside];
[goToTop setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[goToTop.layer setBorderColor:[[UIColor redColor] CGColor]];
[self.tableView addSubview:goToTop];
goToTop.translatesAutoresizingMaskIntoConstraints = NO;
/* Leading space to superview */
NSLayoutConstraint *leftButtonXConstraint = [NSLayoutConstraint
constraintWithItem:goToTop attribute:NSLayoutAttributeRight
relatedBy:NSLayoutRelationEqual toItem:self.tableView attribute:
NSLayoutAttributeLeft multiplier:1.0 constant:20];
/* Top space to superview Y*/
NSLayoutConstraint *leftButtonYConstraint = [NSLayoutConstraint
constraintWithItem:goToTop attribute:NSLayoutAttributeBottom
relatedBy:NSLayoutRelationEqual toItem:self.tableView attribute:
NSLayoutAttributeTop multiplier:1.0f constant:20];
/* Fixed width */
NSLayoutConstraint *widthConstraint = [NSLayoutConstraint constraintWithItem:goToTop
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:nil
attribute:NSLayoutAttributeNotAnAttribute
multiplier:1.0
constant:60];
/* Fixed Height */
NSLayoutConstraint *heightConstraint = [NSLayoutConstraint constraintWithItem:goToTop
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:nil
attribute:NSLayoutAttributeNotAnAttribute
multiplier:1.0
constant:60];
/* 4. Add the constraints to button's superview*/
[self.tableView addConstraints:#[leftButtonXConstraint, leftButtonYConstraint, widthConstraint, heightConstraint]];
Here is how I would like it:
Here is how it appears:

Answer 1

You have set your constraints to the top left of the table view not the bottom right.
Change this:
/* Leading space to superview */
NSLayoutConstraint *leftButtonXConstraint = [NSLayoutConstraint
constraintWithItem:goToTop attribute:NSLayoutAttributeRight
relatedBy:NSLayoutRelationEqual toItem:self.tableView attribute:
NSLayoutAttributeLeft multiplier:1.0 constant:20];
/* Top space to superview Y*/
NSLayoutConstraint *leftButtonYConstraint = [NSLayoutConstraint
constraintWithItem:goToTop attribute:NSLayoutAttributeBottom
relatedBy:NSLayoutRelationEqual toItem:self.tableView attribute:
NSLayoutAttributeTop multiplier:1.0f constant:20];
To this:
/* Leading space to superview */
NSLayoutConstraint *leftButtonXConstraint = [NSLayoutConstraint
constraintWithItem:goToTop attribute:NSLayoutAttributeRight
relatedBy:NSLayoutRelationEqual toItem:self.tableView attribute:
NSLayoutAttributeRight multiplier:1.0 constant:20];
/* Top space to superview Y*/
NSLayoutConstraint *leftButtonYConstraint = [NSLayoutConstraint
constraintWithItem:goToTop attribute:NSLayoutAttributeBottom
relatedBy:NSLayoutRelationEqual toItem:self.tableView attribute:
NSLayoutAttributeBottom multiplier:1.0f constant:20];