easy make view`s constraint Fluid style.
// before use fluid style
tableView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
tableView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
tableView.topAnchor.constraint(equalTo: topLayoutGuide.bottomAnchor).isActive = true
tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
// after use fluid style
tableView
.fs_leftAnchor(equalTo: view.leftAnchor)
.fs_rightAnchor(equalTo: view.rightAnchor)
.fs_topAnchor(equalTo: topLayoutGuide.bottomAnchor)
.fs_bottomAnchor(equalTo: view.bottomAnchor)
.fs_endSetup()