如何在swift 4中将表格视图控制器前面的按钮带到？ [重复]

Posted 2021-04-18

这个问题在这里已有答案：

• Add view over tableview (UITableViewController) 6个答案

我有一个表视图控制器，唯一的方法是使用它所以请不要告诉我使用viewController而不是tableviewController这里是我的代码添加一个按钮，这个按钮显示在最后一个单元格但我想要的时候用户滚动表视图按钮位于屏幕底部而不移动

override func viewDidLoad() {
    super.viewDidLoad()


    let submitButton = UIButton(frame: CGRect(x: 5, y: view.frame.origin.y + view.frame.size.height, width: self.view.frame.width - 10 , height: 50))

    submitButton.backgroundColor = UIColor.init(red: 180/255, green: 40/255, blue: 56/255, alpha: 1.0)
    submitButton.setTitle("Submit", for: .normal)
    submitButton.titleLabel?.font = UIFont(name: "Arial", size: 15)
    submitButton.titleLabel?.textColor = .white
    submitButton.addTarget(self, action: #selector(submit), for: .touchUpInside)
    submitButton.layer.cornerRadius = 5
    view.addSubview(submitButton)

答案

如果适合您的场景，请尝试此方法：

var submitButton = UIButton()

override func viewDidLoad() {
    super.viewDidLoad()


    submitButton.frame = CGRect(x: 5, y: view.frame.origin.y + view.frame.size.height, width: self.view.frame.width - 10 , height: 50)

    submitButton.backgroundColor = UIColor.init(red: 180/255, green: 40/255, blue: 56/255, alpha: 1.0)
    submitButton.setTitle("Submit", for: .normal)
    submitButton.titleLabel?.font = UIFont(name: "Arial", size: 15)
    submitButton.titleLabel?.textColor = .white
    submitButton.addTarget(self, action: #selector(submit), for: .touchUpInside)
    submitButton.layer.cornerRadius = 5
    self.view.window?.addSubview(submitButton)
}

但在这种情况下，您必须从viewWillDisappear中的superview中删除该按钮：

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    self. submitButton.removeFromSuperview()
}

另一答案

试试这个

将按钮声明为变量

   var submitButton:UIButton!

并在viewDidLoad中

    submitButton = UIButton(frame: CGRect(x: 5, y: UIScreen.main.bounds.size.height - 50 , width: UIScreen.main.bounds.size.width - 10 , height: 50))        
    submitButton.backgroundColor = UIColor.init(red: 180/255, green: 40/255, blue: 56/255, alpha: 1.0)
    submitButton.setTitle("Submit", for: .normal)
    submitButton.titleLabel?.font = UIFont(name: "Arial", size: 15)
    submitButton.titleLabel?.textColor = .white
    submitButton.addTarget(self, action: #selector(submit), for: .touchUpInside)
    submitButton.layer.cornerRadius = 5        
    self.view.addSubview(submitButton)

并实现此方法

 override func scrollViewDidScroll(_ scrollView: UIScrollView) {

  submitButton.frame = CGRect.init(x: submitButton.frame.origin.x, y:  UIScreen.main.bounds.size.height + scrollView.contentOffset.y - 50 , width: submitButton.frame.width, height: submitButton.frame.height)

}