Swift：使用StoryBoard在Tableview上浮动加号按钮

它有点晚了,但也许可以帮助别人.您可以通过编程方式轻松完成.只需创建按钮的实例,设置按钮的所需属性最好在框架上使用约束,因为它会在每个屏幕尺寸的相同位置渲染按钮.我发布的代码将使按钮轮.使用约束值来改变按钮的位置和大小.

斯威夫特3

var roundButton = UIButton()
override func viewDidLoad() {
    super.viewDidLoad()
    self.roundButton = UIButton(type: .custom)
    self.roundButton.setTitleColor(UIColor.orange,for: .normal)
    self.roundButton.addTarget(self,action: #selector(ButtonClick(_:)),for: UIControlEvents.touchUpInside)
    self.view.addSubview(roundButton)
}

override func viewWillLayoutSubviews() {

    roundButton.layer.cornerRadius = roundButton.layer.frame.size.width/2
    roundButton.backgroundColor = UIColor.lightGray
    roundButton.clipsToBounds = true
    roundButton.setimage(UIImage(named:"your-image"),for: .normal)
    roundButton.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
        roundButton.trailingAnchor.constraint(equalTo: self.view.trailingAnchor,constant: -3),roundButton.bottomAnchor.constraint  
    (equalTo: self.view.bottomAnchor,constant: -53),roundButton.widthAnchor.constraint(equalToConstant: 50),roundButton.heightAnchor.constraint(equalToConstant: 50)])
}

/** Action Handler for button **/

@IBAction func ButtonClick(_ sender: UIButton){

 /** Do whatever you wanna do on button click**/

}