// 按钮高度60，左右等于边，下距离安全区15

[NSLayoutConstraint activateConstraints:@[
        [button.heightAnchor constraintEqualToConstant:60],
        [button.leadingAnchor constraintEqualToAnchor:self.view.leadingAnchor],
        [button.trailingAnchor constraintEqualToAnchor:self.view.trailingAnchor],
        [button.bottomAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.bottomAnchor constant:-15]
 ]];

// tableView的上下右等于边，下边距离安全区-100

[NSLayoutConstraint activateConstraints:@[
        [self.tableView.topAnchor constraintEqualToAnchor:self.view.topAnchor],
        [self.tableView.leadingAnchor constraintEqualToAnchor:self.view.leadingAnchor],
        [self.tableView.trailingAnchor constraintEqualToAnchor:self.view.trailingAnchor],
        [self.tableView.bottomAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.bottomAnchor constant:-100]
]];

• 需要注意的是
  布局的translatesAutoresizingMaskIntoConstraints属性需要设置为NO