关闭按钮在 Swift 操场上不起作用
Close Button Not Working in Swift Playground
我正在为 WWDC 开发 Swift 游乐场。我需要一个 UI 按钮来关闭 Web 视图和工具栏（该按钮称为 closeButton，该按钮的功能位于该按钮的底部），并在单击时 returns 返回到先前的屏幕（第一视角）。下面的代码是我到目前为止输入的Swift：
import UIKit
import WebKit
import PlaygroundSupport
import Foundation
PlaygroundPage.current.needsIndefiniteExecution = true
class MyViewController : UIViewController {
let cardView = UIView()
let accountButton = UIButton()
let coverImageView = UIImageView()
let swiftLogoView = UIImageView()
let openLabel = UILabel()
let titleLabel = UILabel()
let label = UILabel()
let captionLabel = UILabel()
let descriptionLabel = UILabel()
let backgroundImageView = UIImageView()
let closeButton = UIButton()
let openButton = UIButton()
let doneButton = UIButton()
let url1 = URL(string: "https://youtube.com/embed/uuxXHAKA1WY")!
let alertController = UIAlertController(title: "Who Made This Playground:", message: "Mark Bruckert made this playground for WWDC 2018. He is a Web and Graphic Designer learning Swift and IOS Design. He would love to attend this year, to learn the new frameworks revealed at the event and have IOS Engineers review his designs and code.", preferredStyle: .alert)
let defaultAction = UIAlertAction(title: "Close", style: .default, handler: nil)
let menuBar = UIView()
let doneLabel = UILabel()
let webView = UIWebView()
let cardView2 = UIView()
let coverImageView2 = UIImageView()
let titleLabel2 = UILabel()
let captionLabel2 = UILabel()
let descriptionLabel2 = UILabel()
let backgroundImageView2 = UIImageView()
let url2 = URL(string: "https://youtu.be/uuxXHAKA1WY")!
override func loadView() {
let view = UIView()
view.backgroundColor = .white
label.frame = CGRect(x: 20, y: 30, width: 272, height: 38)
label.text = "Dev Tutorials:"
label.textColor = .black
label.font = UIFont.systemFont(ofSize: 32, weight: .bold)
openLabel.frame = CGRect(x: 140, y: 215, width: 272, height: 38)
openLabel.text = "Play Video"
openLabel.textColor = .black
openLabel.font = UIFont.systemFont(ofSize: 32, weight: .semibold)
self.openLabel.alpha = 0
openLabel.layer.zPosition = 5
doneLabel.frame = CGRect(x: 25, y: 5, width: 272, height: 38)
doneLabel.text = "Done"
doneLabel.textColor = .white
doneLabel.font = UIFont.systemFont(ofSize: 32, weight: .light)
openLabel.layer.zPosition = 7
doneButton.addTarget(self, action: #selector(doneButtonTapped), for: .touchUpInside
)
cardView.frame = CGRect(x: 60, y: 100, width: 300, height: 250)
cardView.layer.cornerRadius = 14
cardView.backgroundColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)
cardView.layer.shadowOpacity = 0.25
cardView.layer.shadowOffset = CGSize(width: 0, height: 10)
cardView.layer.shadowRadius = 10
cardView2.frame = CGRect(x: 60, y: 100, width: 300, height: 250)
cardView2.layer.cornerRadius = 14
cardView2.backgroundColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)
cardView2.layer.shadowOpacity = 0.25
cardView2.layer.shadowOffset = CGSize(width: 0, height: 10)
cardView2.layer.shadowRadius = 10
titleLabel.frame = CGRect(x: 16, y: 16, width: 272, height: 38)
titleLabel.text = "Portals with ARKit"
titleLabel.textColor = .white
titleLabel.font = UIFont.systemFont(ofSize: 32, weight: .semibold)
captionLabel.frame = CGRect(x: 16, y: 204, width: 272, height: 40)
captionLabel.text = "by Jared Davidson"
captionLabel.textColor = .white
captionLabel.numberOfLines = 0
descriptionLabel.frame = CGRect(x: 20, y: 400, width: 335, height: 132)
descriptionLabel.text = "In this tutorial, you will learn how to use ARKit by Apple to transport yourself through a portal."
descriptionLabel.textColor = .black
descriptionLabel.numberOfLines = 10
descriptionLabel.alpha = 0
coverImageView.frame = CGRect(x: 0, y: 0, width: 300, height: 250)
coverImageView.contentMode = .scaleAspectFill
coverImageView.image = #imageLiteral(resourceName: "Cover.jpg")
coverImageView.clipsToBounds = true
swiftLogoView.frame = CGRect(x: 8, y: 8, width: 35, height: 35)
swiftLogoView.contentMode = .scaleAspectFill
swiftLogoView.image = #imageLiteral(resourceName: "Swift_logo.png")
swiftLogoView.clipsToBounds = true
coverImageView.layer.cornerRadius = 14
accountButton.frame = CGRect(x: 360, y: 20, width: 55, height: 55)
accountButton.backgroundColor = #colorLiteral(red: 0.803921580314636, green: 0.803921580314636, blue: 0.803921580314636, alpha: 1.0)
accountButton.layer.cornerRadius = 30
accountButton.addTarget(self, action: #selector(accountButtonTapped), for: .touchUpInside)
closeButton.frame = CGRect(x: 360, y: 20, width: 28, height: 28)
closeButton.backgroundColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 0.5)
closeButton.layer.cornerRadius = 14
closeButton.setImage(#imageLiteral(resourceName: "Action-Close@2x.png"), for: .normal)
closeButton.addTarget(self, action: #selector(closeButtonTapped), for: .touchUpInside)
closeButton.alpha = 0
openButton.frame = CGRect(x: 100, y: 200, width: 220, height: 75)
openButton.backgroundColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
openButton.layer.cornerRadius = 14
openButton.addTarget(self, action: #selector(openButtonTapped), for: .touchUpInside)
openButton.alpha = 0
doneButton.frame = CGRect(x: 10, y: 5, width: 130, height: 50)
doneButton.layer.borderWidth = 3.0
doneButton.layer.borderColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
doneButton.layer.cornerRadius = 14
doneButton.addTarget(self, action: #selector(doneButtonTapped), for: .touchUpInside)
cardView.addSubview(coverImageView)
cardView.addSubview(openLabel)
doneButton.addSubview(doneLabel)
cardView.addSubview(closeButton)
cardView.addSubview(openButton)
menuBar.addSubview(doneButton)
cardView.addSubview(descriptionLabel)
view.addSubview(cardView)
view.addSubview(label)
view.addSubview(accountButton)
let tap = UITapGestureRecognizer(target: self, action: #selector(cardViewTapped))
cardView.addGestureRecognizer(tap)
cardView.isUserInteractionEnabled = true
doneButton.isUserInteractionEnabled = true
self.view = view
}
@objc func cardViewTapped() {
let animator = UIViewPropertyAnimator(duration: 0.7, dampingRatio: 0.7) {
self.cardView.frame = CGRect(x: 0, y: 0, width: 450, height: 667)
self.label.layer.isHidden = true
self.cardView.layer.cornerRadius = 0
self.titleLabel.frame = CGRect(x: 20, y: 20, width: 374, height: 38)
self.captionLabel.frame = CGRect(x: 20, y: 370, width: 272, height: 40)
self.descriptionLabel.alpha = 1
self.coverImageView.frame = CGRect(x: 0, y: 0, width: 450, height: 420)
self.coverImageView.layer.cornerRadius = 0
self.closeButton.alpha = 1
self.openButton.alpha = 0.7
self.accountButton.alpha = 0
self.openLabel.alpha = 1
}
animator.startAnimation()
}
@objc func closeButtonTapped() {
let animator = UIViewPropertyAnimator(duration: 0.7, dampingRatio: 0.7) {
self.cardView.frame = CGRect(x: 60, y: 100, width: 300, height: 250)
self.cardView.layer.cornerRadius = 14
self.titleLabel.frame = CGRect(x: 16, y: 16, width: 272, height: 38)
self.captionLabel.frame = CGRect(x: 16, y: 204, width: 272, height: 40)
self.descriptionLabel.alpha = 0
self.coverImageView.frame = CGRect(x: 0, y: 0, width: 300, height: 250)
self.coverImageView.layer.cornerRadius = 14
self.closeButton.alpha = 0
self.label.layer.isHidden = false
self.openButton.alpha = 0
self.openLabel.alpha = 0
self.accountButton.alpha = 1
}
animator.startAnimation()
}
@objc func openButtonTapped() {
let view = UIView(frame: CGRect(x: 0, y: 0, width: 320, height: 600))
view.backgroundColor = UIColor.lightGray
PlaygroundPage.current.liveView = view
menuBar.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(menuBar)
menuBar.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
menuBar.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
menuBar.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
menuBar.heightAnchor.constraint(equalToConstant: 64.0).isActive = true
menuBar.backgroundColor = #colorLiteral(red: 0.803921580314636, green: 0.803921580314636, blue: 0.803921580314636, alpha: 1.0)
let toolbar = UIView()
toolbar.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(toolbar)
toolbar.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
toolbar.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
toolbar.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
toolbar.heightAnchor.constraint(equalToConstant: 64.0).isActive = true
toolbar.backgroundColor = #colorLiteral(red: 0.803921580314636, green: 0.803921580314636, blue: 0.803921580314636, alpha: 1.0)
webView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(webView)
webView.topAnchor.constraint(equalTo: menuBar.bottomAnchor, constant: 8.0).isActive = true
webView.bottomAnchor.constraint(equalTo: toolbar.topAnchor, constant: -8.0).isActive = true
webView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
webView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
webView.loadRequest(URLRequest(url: URL(string:"https://youtube.com/embed/uuxXHAKA1WY")!))
}
@objc func accountButtonTapped() {
present(alertController, animated: true, completion: nil)
alertController.addAction(defaultAction)
}
@objc func doneButtonTapped() {
self.webView.alpha = 0
self.view.alpha = 0
}
}
// Present the view controller in the Live View window
PlaygroundPage.current.liveView = MyViewController()
在此先感谢您的帮助，
马克·B.
在方法 openButtonTapped 中，局部变量 view 给您的代码造成了问题。另外，您再次调用了 liveView。我已经修改了你的代码，假设最后一个屏幕将转到上一个屏幕，它正在工作。
首先，将toolBar 声明为成员变量，如menuBar。然后编写以下代码。点击完成按钮将转到上一个。
@objc func openButtonTapped() {
view.backgroundColor = UIColor.cyan
menuBar.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(menuBar)
menuBar.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
menuBar.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
menuBar.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
menuBar.heightAnchor.constraint(equalToConstant: 64.0).isActive = true
menuBar.backgroundColor = #colorLiteral(red: 0.803921580314636, green: 0.803921580314636, blue: 0.803921580314636, alpha: 1.0)
toolbar.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(toolbar)
toolbar.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
toolbar.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
toolbar.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
toolbar.heightAnchor.constraint(equalToConstant: 64.0).isActive = true
toolbar.backgroundColor = #colorLiteral(red: 0.803921580314636, green: 0.803921580314636, blue: 0.803921580314636, alpha: 1.0)
webView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(webView)
webView.topAnchor.constraint(equalTo: menuBar.bottomAnchor, constant: 8.0).isActive = true
webView.bottomAnchor.constraint(equalTo: toolbar.topAnchor, constant: -8.0).isActive = true
webView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
webView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
webView.loadRequest(URLRequest(url: URL(string:"https://youtube.com/embed/uuxXHAKA1WY")!))
}
@objc func accountButtonTapped() {
present(alertController, animated: true, completion: nil)
alertController.addAction(defaultAction)
}
@objc func doneButtonTapped() {
print("test")
self.webView.stopLoading()
self.webView.alpha = 0
toolbar.removeFromSuperview()
menuBar.removeFromSuperview()
}
我正在为 WWDC 开发 Swift 游乐场。我需要一个 UI 按钮来关闭 Web 视图和工具栏（该按钮称为 closeButton，该按钮的功能位于该按钮的底部），并在单击时 returns 返回到先前的屏幕（第一视角）。下面的代码是我到目前为止输入的Swift：
import UIKit
import WebKit
import PlaygroundSupport
import Foundation
PlaygroundPage.current.needsIndefiniteExecution = true
class MyViewController : UIViewController {
let cardView = UIView()
let accountButton = UIButton()
let coverImageView = UIImageView()
let swiftLogoView = UIImageView()
let openLabel = UILabel()
let titleLabel = UILabel()
let label = UILabel()
let captionLabel = UILabel()
let descriptionLabel = UILabel()
let backgroundImageView = UIImageView()
let closeButton = UIButton()
let openButton = UIButton()
let doneButton = UIButton()
let url1 = URL(string: "https://youtube.com/embed/uuxXHAKA1WY")!
let alertController = UIAlertController(title: "Who Made This Playground:", message: "Mark Bruckert made this playground for WWDC 2018. He is a Web and Graphic Designer learning Swift and IOS Design. He would love to attend this year, to learn the new frameworks revealed at the event and have IOS Engineers review his designs and code.", preferredStyle: .alert)
let defaultAction = UIAlertAction(title: "Close", style: .default, handler: nil)
let menuBar = UIView()
let doneLabel = UILabel()
let webView = UIWebView()
let cardView2 = UIView()
let coverImageView2 = UIImageView()
let titleLabel2 = UILabel()
let captionLabel2 = UILabel()
let descriptionLabel2 = UILabel()
let backgroundImageView2 = UIImageView()
let url2 = URL(string: "https://youtu.be/uuxXHAKA1WY")!
override func loadView() {
let view = UIView()
view.backgroundColor = .white
label.frame = CGRect(x: 20, y: 30, width: 272, height: 38)
label.text = "Dev Tutorials:"
label.textColor = .black
label.font = UIFont.systemFont(ofSize: 32, weight: .bold)
openLabel.frame = CGRect(x: 140, y: 215, width: 272, height: 38)
openLabel.text = "Play Video"
openLabel.textColor = .black
openLabel.font = UIFont.systemFont(ofSize: 32, weight: .semibold)
self.openLabel.alpha = 0
openLabel.layer.zPosition = 5
doneLabel.frame = CGRect(x: 25, y: 5, width: 272, height: 38)
doneLabel.text = "Done"
doneLabel.textColor = .white
doneLabel.font = UIFont.systemFont(ofSize: 32, weight: .light)
openLabel.layer.zPosition = 7
doneButton.addTarget(self, action: #selector(doneButtonTapped), for: .touchUpInside
)
cardView.frame = CGRect(x: 60, y: 100, width: 300, height: 250)
cardView.layer.cornerRadius = 14
cardView.backgroundColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)
cardView.layer.shadowOpacity = 0.25
cardView.layer.shadowOffset = CGSize(width: 0, height: 10)
cardView.layer.shadowRadius = 10
cardView2.frame = CGRect(x: 60, y: 100, width: 300, height: 250)
cardView2.layer.cornerRadius = 14
cardView2.backgroundColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)
cardView2.layer.shadowOpacity = 0.25
cardView2.layer.shadowOffset = CGSize(width: 0, height: 10)
cardView2.layer.shadowRadius = 10
titleLabel.frame = CGRect(x: 16, y: 16, width: 272, height: 38)
titleLabel.text = "Portals with ARKit"
titleLabel.textColor = .white
titleLabel.font = UIFont.systemFont(ofSize: 32, weight: .semibold)
captionLabel.frame = CGRect(x: 16, y: 204, width: 272, height: 40)
captionLabel.text = "by Jared Davidson"
captionLabel.textColor = .white
captionLabel.numberOfLines = 0
descriptionLabel.frame = CGRect(x: 20, y: 400, width: 335, height: 132)
descriptionLabel.text = "In this tutorial, you will learn how to use ARKit by Apple to transport yourself through a portal."
descriptionLabel.textColor = .black
descriptionLabel.numberOfLines = 10
descriptionLabel.alpha = 0
coverImageView.frame = CGRect(x: 0, y: 0, width: 300, height: 250)
coverImageView.contentMode = .scaleAspectFill
coverImageView.image = #imageLiteral(resourceName: "Cover.jpg")
coverImageView.clipsToBounds = true
swiftLogoView.frame = CGRect(x: 8, y: 8, width: 35, height: 35)
swiftLogoView.contentMode = .scaleAspectFill
swiftLogoView.image = #imageLiteral(resourceName: "Swift_logo.png")
swiftLogoView.clipsToBounds = true
coverImageView.layer.cornerRadius = 14
accountButton.frame = CGRect(x: 360, y: 20, width: 55, height: 55)
accountButton.backgroundColor = #colorLiteral(red: 0.803921580314636, green: 0.803921580314636, blue: 0.803921580314636, alpha: 1.0)
accountButton.layer.cornerRadius = 30
accountButton.addTarget(self, action: #selector(accountButtonTapped), for: .touchUpInside)
closeButton.frame = CGRect(x: 360, y: 20, width: 28, height: 28)
closeButton.backgroundColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 0.5)
closeButton.layer.cornerRadius = 14
closeButton.setImage(#imageLiteral(resourceName: "Action-Close@2x.png"), for: .normal)
closeButton.addTarget(self, action: #selector(closeButtonTapped), for: .touchUpInside)
closeButton.alpha = 0
openButton.frame = CGRect(x: 100, y: 200, width: 220, height: 75)
openButton.backgroundColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
openButton.layer.cornerRadius = 14
openButton.addTarget(self, action: #selector(openButtonTapped), for: .touchUpInside)
openButton.alpha = 0
doneButton.frame = CGRect(x: 10, y: 5, width: 130, height: 50)
doneButton.layer.borderWidth = 3.0
doneButton.layer.borderColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
doneButton.layer.cornerRadius = 14
doneButton.addTarget(self, action: #selector(doneButtonTapped), for: .touchUpInside)
cardView.addSubview(coverImageView)
cardView.addSubview(openLabel)
doneButton.addSubview(doneLabel)
cardView.addSubview(closeButton)
cardView.addSubview(openButton)
menuBar.addSubview(doneButton)
cardView.addSubview(descriptionLabel)
view.addSubview(cardView)
view.addSubview(label)
view.addSubview(accountButton)
let tap = UITapGestureRecognizer(target: self, action: #selector(cardViewTapped))
cardView.addGestureRecognizer(tap)
cardView.isUserInteractionEnabled = true
doneButton.isUserInteractionEnabled = true
self.view = view
}
@objc func cardViewTapped() {
let animator = UIViewPropertyAnimator(duration: 0.7, dampingRatio: 0.7) {
self.cardView.frame = CGRect(x: 0, y: 0, width: 450, height: 667)
self.label.layer.isHidden = true
self.cardView.layer.cornerRadius = 0
self.titleLabel.frame = CGRect(x: 20, y: 20, width: 374, height: 38)
self.captionLabel.frame = CGRect(x: 20, y: 370, width: 272, height: 40)
self.descriptionLabel.alpha = 1
self.coverImageView.frame = CGRect(x: 0, y: 0, width: 450, height: 420)
self.coverImageView.layer.cornerRadius = 0
self.closeButton.alpha = 1
self.openButton.alpha = 0.7
self.accountButton.alpha = 0
self.openLabel.alpha = 1
}
animator.startAnimation()
}
@objc func closeButtonTapped() {
let animator = UIViewPropertyAnimator(duration: 0.7, dampingRatio: 0.7) {
self.cardView.frame = CGRect(x: 60, y: 100, width: 300, height: 250)
self.cardView.layer.cornerRadius = 14
self.titleLabel.frame = CGRect(x: 16, y: 16, width: 272, height: 38)
self.captionLabel.frame = CGRect(x: 16, y: 204, width: 272, height: 40)
self.descriptionLabel.alpha = 0
self.coverImageView.frame = CGRect(x: 0, y: 0, width: 300, height: 250)
self.coverImageView.layer.cornerRadius = 14
self.closeButton.alpha = 0
self.label.layer.isHidden = false
self.openButton.alpha = 0
self.openLabel.alpha = 0
self.accountButton.alpha = 1
}
animator.startAnimation()
}
@objc func openButtonTapped() {
let view = UIView(frame: CGRect(x: 0, y: 0, width: 320, height: 600))
view.backgroundColor = UIColor.lightGray
PlaygroundPage.current.liveView = view
menuBar.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(menuBar)
menuBar.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
menuBar.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
menuBar.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
menuBar.heightAnchor.constraint(equalToConstant: 64.0).isActive = true
menuBar.backgroundColor = #colorLiteral(red: 0.803921580314636, green: 0.803921580314636, blue: 0.803921580314636, alpha: 1.0)
let toolbar = UIView()
toolbar.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(toolbar)
toolbar.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
toolbar.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
toolbar.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
toolbar.heightAnchor.constraint(equalToConstant: 64.0).isActive = true
toolbar.backgroundColor = #colorLiteral(red: 0.803921580314636, green: 0.803921580314636, blue: 0.803921580314636, alpha: 1.0)
webView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(webView)
webView.topAnchor.constraint(equalTo: menuBar.bottomAnchor, constant: 8.0).isActive = true
webView.bottomAnchor.constraint(equalTo: toolbar.topAnchor, constant: -8.0).isActive = true
webView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
webView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
webView.loadRequest(URLRequest(url: URL(string:"https://youtube.com/embed/uuxXHAKA1WY")!))
}
@objc func accountButtonTapped() {
present(alertController, animated: true, completion: nil)
alertController.addAction(defaultAction)
}
@objc func doneButtonTapped() {
self.webView.alpha = 0
self.view.alpha = 0
}
}
// Present the view controller in the Live View window
PlaygroundPage.current.liveView = MyViewController()
在此先感谢您的帮助， 马克·B.
在方法 openButtonTapped 中，局部变量 view 给您的代码造成了问题。另外，您再次调用了 liveView。我已经修改了你的代码，假设最后一个屏幕将转到上一个屏幕，它正在工作。
首先，将toolBar 声明为成员变量，如menuBar。然后编写以下代码。点击完成按钮将转到上一个。
@objc func openButtonTapped() {
view.backgroundColor = UIColor.cyan
menuBar.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(menuBar)
menuBar.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
menuBar.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
menuBar.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
menuBar.heightAnchor.constraint(equalToConstant: 64.0).isActive = true
menuBar.backgroundColor = #colorLiteral(red: 0.803921580314636, green: 0.803921580314636, blue: 0.803921580314636, alpha: 1.0)
toolbar.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(toolbar)
toolbar.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
toolbar.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
toolbar.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
toolbar.heightAnchor.constraint(equalToConstant: 64.0).isActive = true
toolbar.backgroundColor = #colorLiteral(red: 0.803921580314636, green: 0.803921580314636, blue: 0.803921580314636, alpha: 1.0)
webView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(webView)
webView.topAnchor.constraint(equalTo: menuBar.bottomAnchor, constant: 8.0).isActive = true
webView.bottomAnchor.constraint(equalTo: toolbar.topAnchor, constant: -8.0).isActive = true
webView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
webView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
webView.loadRequest(URLRequest(url: URL(string:"https://youtube.com/embed/uuxXHAKA1WY")!))
}
@objc func accountButtonTapped() {
present(alertController, animated: true, completion: nil)
alertController.addAction(defaultAction)
}
@objc func doneButtonTapped() {
print("test")
self.webView.stopLoading()
self.webView.alpha = 0
toolbar.removeFromSuperview()
menuBar.removeFromSuperview()
}