Swift UITABBARC控制器上的快速浮动按钮

我有一个带有3个部分的选项卡栏控制器。我还为特殊功能创建了一个浮动按钮，但现在它只在一个部分上。我想添加这个按钮一次，并显示在所有部分。因此，您可以在所有应用程序中使用此按钮

可能吗

一个想法是将此按钮添加到UITabBarController。可能吗？你知道吗

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谢谢

您需要将其添加到应用程序的窗口中

let del = UIApplication.shared.delegate as! AppDelegate

del.window?.addSubview(btn)

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您需要将其添加到应用程序的窗口中

let del = UIApplication.shared.delegate as! AppDelegate

del.window?.addSubview(btn)

---

Swift 4

您需要子类tabbare来操作它

import UIKit

class CustomTabBarViewController: UITabBarController {
let btn = UIButton() //Here create your button

override func viewDidLoad() {
    super.viewDidLoad()

    //Here set up your button

    self.view.insertSubview(btn, belowSubview: self.tabBar) //<--This is important. 
   //With this call you have a button that is over all view but under the tab bar. 
   //So if you have a round button that it expanded on click, the expanded 
   //part could be hidden by the tab bar, if it is near to tab bar.


   //Other button's setting if you need

    btn.translatesAutoresizingMaskIntoConstraints = false //<- Important
   //Because you are adding the button programmatically you need set the
   //constraints. to do it, you need set to false the autoresizing mask.

    //Here set the constraints.
    //These constraints put the button in the lower right corner, over the tab bar
    let viewDictionary = ["button":btn, "tabBar":self.tabBar]
    let btn_V = NSLayoutConstraint.constraints(withVisualFormat: "V:[button(340)]", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewDictionary)
    let btn_H = NSLayoutConstraint.constraints(withVisualFormat: "H:[button(340)]", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewDictionary)
    let btn_POS_V = NSLayoutConstraint.constraints(withVisualFormat: "V:[button]-(-130)-[tabBar]", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewDictionary)
    let btn_POS_H = NSLayoutConstraint.constraints(withVisualFormat: "H:[button]-(-129)-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewDictionary)

    btn.addConstraints(btn_V)
    btn.addConstraints(btn_H)
    self.view.addConstraints(btn_POS_H)
    self.view.addConstraints(btn_POS_V)


}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
}
*/ 

}

导入UIKit
类CustomTabBarViewController:UITabBarController{
让btn=UIButton（）//在这里创建按钮
重写func viewDidLoad（）{
super.viewDidLoad（）
//这里设置您的按钮
self.view.insertSubview（btn，belowSubview:self.tabBar）/Swift 4

您需要子类tabbare来操作它

import UIKit

class CustomTabBarViewController: UITabBarController {
let btn = UIButton() //Here create your button

override func viewDidLoad() {
    super.viewDidLoad()

    //Here set up your button

    self.view.insertSubview(btn, belowSubview: self.tabBar) //<--This is important. 
   //With this call you have a button that is over all view but under the tab bar. 
   //So if you have a round button that it expanded on click, the expanded 
   //part could be hidden by the tab bar, if it is near to tab bar.


   //Other button's setting if you need

    btn.translatesAutoresizingMaskIntoConstraints = false //<- Important
   //Because you are adding the button programmatically you need set the
   //constraints. to do it, you need set to false the autoresizing mask.

    //Here set the constraints.
    //These constraints put the button in the lower right corner, over the tab bar
    let viewDictionary = ["button":btn, "tabBar":self.tabBar]
    let btn_V = NSLayoutConstraint.constraints(withVisualFormat: "V:[button(340)]", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewDictionary)
    let btn_H = NSLayoutConstraint.constraints(withVisualFormat: "H:[button(340)]", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewDictionary)
    let btn_POS_V = NSLayoutConstraint.constraints(withVisualFormat: "V:[button]-(-130)-[tabBar]", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewDictionary)
    let btn_POS_H = NSLayoutConstraint.constraints(withVisualFormat: "H:[button]-(-129)-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewDictionary)

    btn.addConstraints(btn_V)
    btn.addConstraints(btn_H)
    self.view.addConstraints(btn_POS_H)
    self.view.addConstraints(btn_POS_V)


}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
}
*/ 

}

导入UIKit
类CustomTabBarViewController:UITabBarController{
让btn=UIButton（）//在这里创建按钮
重写func viewDidLoad（）{
super.viewDidLoad（）
//这里设置您的按钮
self.view.insertSubview（btn，belowSubview:self.tabBar）//非常感谢。有办法制作故事板吗？或者只能通过编程实现吗？我尝试了你的代码，但没有成功。你看不到按钮，因为它位于选项卡栏包含的viewController下。有什么建议吗？非常感谢。有办法制作故事板吗？或者只能通过编程实现吗？我尝试了你的代码，但没有成功on不工作。您看不到该按钮，因为它位于选项卡栏包含的viewController下。有什么建议吗？