当用户使用 swift 注册或登录 messageView 时，我如何使用 activity 指示器 3

Question

当用户注册或登录消息视图时，如何在以下代码中使用activity指示器。

下面的代码是一个 loginViewController，它处理用户的登录和注册。

那么，我如何在用户点击登录或注册按钮时以编程方式使用 Activity 指示器视图或进度视图。

class LoginController: UIViewController {

        var messagesController: MessagesController?

    let inputsContainerView: UIView = {
        let view = UIView()
        view.backgroundColor = UIColor(r: 209, g:238, b:252).withAlphaComponent(0.3)
        view.translatesAutoresizingMaskIntoConstraints = false
        view.layer.cornerRadius = 5
        view.layer.masksToBounds = true
        return view
    }()

    lazy var loginRegisterButton: UIButton = {
        let button = UIButton(type: .system)
        button.backgroundColor = UIColor(r: 255, g: 45, b: 85)
        button.setTitle("Register", for: UIControlState())
        button.translatesAutoresizingMaskIntoConstraints = false
        button.setTitleColor(UIColor.white, for: UIControlState())
        button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 16)
        button.layer.cornerRadius = 10
        button.addTarget(self, action: #selector(handleLoginRegister), for: .touchUpInside)

        return button
    }()


    func handleLoginRegister() {
        if loginRegisterSegmentedControl.selectedSegmentIndex == 0 {
            handleLogin()
        } else {
            handleRegister()
        }
    }

    func handleLogin() {
        guard let email = emailTextField.text, let password = passwordTextField.text else {
            print("Form is not valid")
            return
        }

        FIRAuth.auth()?.signIn(withEmail: email, password: password, completion: { (user, error) in

            if error != nil {
                print(error ?? "")
                return
            }

            //successfully logged in our user

            self.messagesController?.fetchUserAndSetupNavBarTitle()

            self.dismiss(animated: true, completion: nil)

        })

    }

 // TextField, EmailTextField, PasswordTextField, seperator view

    let nameTextField: UITextField = {
        let tf = UITextField()
        tf.placeholder = "Name"
        tf.translatesAutoresizingMaskIntoConstraints = false
        return tf
    }()

    let nameSeparatorView: UIView = {
        let view = UIView()
        view.backgroundColor = UIColor(r: 220, g: 220, b: 220)
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()

    let emailTextField: UITextField = {
        let tf = UITextField()
        tf.placeholder = "Email"
        tf.translatesAutoresizingMaskIntoConstraints = false
        return tf
    }()

    let emailSeparatorView: UIView = {
        let view = UIView()
        view.backgroundColor = UIColor(r: 220, g: 220, b: 220)
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()

    let passwordTextField: UITextField = {
        let tf = UITextField()
        tf.placeholder = "Password"
        tf.translatesAutoresizingMaskIntoConstraints = false
        tf.isSecureTextEntry = true
        return tf
    }()


    lazy var profileImageView: UIImageView = {
        let imageView = UIImageView()
        imageView.image = UIImage(named: "backslash_inc02main")
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.contentMode = .scaleAspectFill
        imageView.layer.cornerRadius = 20
        imageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleSelectProfileImageView)))
        imageView.isUserInteractionEnabled = true

        return imageView
    }()


    lazy var loginRegisterSegmentedControl: UISegmentedControl = {
        let sc = UISegmentedControl(items: ["Login", "Register"])
        sc.translatesAutoresizingMaskIntoConstraints = false
        sc.tintColor = UIColor.white
        sc.selectedSegmentIndex = 1
        sc.addTarget(self, action: #selector(handleLoginRegisterChange), for: .valueChanged)
        return sc
    }()

    func handleLoginRegisterChange() {
        let title = loginRegisterSegmentedControl.titleForSegment(at: loginRegisterSegmentedControl.selectedSegmentIndex)
        loginRegisterButton.setTitle(title, for: UIControlState())

        // change height of inputContainerView, but how???
        inputsContainerViewHeightAnchor?.constant = loginRegisterSegmentedControl.selectedSegmentIndex == 0 ? 100 : 150

        // change height of nameTextField
        nameTextFieldHeightAnchor?.isActive = false
        nameTextFieldHeightAnchor = nameTextField.heightAnchor.constraint(equalTo: inputsContainerView.heightAnchor, multiplier: loginRegisterSegmentedControl.selectedSegmentIndex == 0 ? 0 : 1/3)
        nameTextFieldHeightAnchor?.isActive = true
        nameTextField.isHidden = loginRegisterSegmentedControl.selectedSegmentIndex == 0

        emailTextFieldHeightAnchor?.isActive = false
        emailTextFieldHeightAnchor = emailTextField.heightAnchor.constraint(equalTo: inputsContainerView.heightAnchor, multiplier: loginRegisterSegmentedControl.selectedSegmentIndex == 0 ? 1/2 : 1/3)
        emailTextFieldHeightAnchor?.isActive = true

        passwordTextFieldHeightAnchor?.isActive = false
        passwordTextFieldHeightAnchor = passwordTextField.heightAnchor.constraint(equalTo: inputsContainerView.heightAnchor, multiplier: loginRegisterSegmentedControl.selectedSegmentIndex == 0 ? 1/2 : 1/3)
        passwordTextFieldHeightAnchor?.isActive = true
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        //view.backgroundColor = UIColor(r: 255, g: 149, b: 0)

        self.view.addBackground()
        view.addSubview(inputsContainerView)
        view.addSubview(loginRegisterButton)
        view.addSubview(profileImageView)
        view.addSubview(loginRegisterSegmentedControl)


        setupInputsContainerView()
        setupLoginRegisterButton()
        setupProfileImageView()
        setupLoginRegisterSegmentedControl()
    }

    func setupLoginRegisterSegmentedControl() {
        //need x, y, width, height constraints
        loginRegisterSegmentedControl.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        loginRegisterSegmentedControl.bottomAnchor.constraint(equalTo: inputsContainerView.topAnchor, constant: -12).isActive = true
        loginRegisterSegmentedControl.widthAnchor.constraint(equalTo: inputsContainerView.widthAnchor, multiplier: 1).isActive = true
        loginRegisterSegmentedControl.heightAnchor.constraint(equalToConstant: 36).isActive = true
    }

    func setupProfileImageView() {
        //need x, y, width, height constraints
        profileImageView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        profileImageView.bottomAnchor.constraint(equalTo: loginRegisterSegmentedControl.topAnchor, constant: -12).isActive = true
        profileImageView.widthAnchor.constraint(equalToConstant: 150).isActive = true
        profileImageView.heightAnchor.constraint(equalToConstant: 150).isActive = true
    }

    var inputsContainerViewHeightAnchor: NSLayoutConstraint?
    var nameTextFieldHeightAnchor: NSLayoutConstraint?
    var emailTextFieldHeightAnchor: NSLayoutConstraint?
    var passwordTextFieldHeightAnchor: NSLayoutConstraint?

    func setupInputsContainerView() {
        //need x, y, width, height constraints
        inputsContainerView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        inputsContainerView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        inputsContainerView.widthAnchor.constraint(equalTo: view.widthAnchor, constant: -24).isActive = true
        inputsContainerViewHeightAnchor = inputsContainerView.heightAnchor.constraint(equalToConstant: 150)
        inputsContainerViewHeightAnchor?.isActive = true

        inputsContainerView.addSubview(nameTextField)
        inputsContainerView.addSubview(nameSeparatorView)
        inputsContainerView.addSubview(emailTextField)
        inputsContainerView.addSubview(emailSeparatorView)
        inputsContainerView.addSubview(passwordTextField)

        //need x, y, width, height constraints
        nameTextField.leftAnchor.constraint(equalTo: inputsContainerView.leftAnchor, constant: 12).isActive = true
        nameTextField.topAnchor.constraint(equalTo: inputsContainerView.topAnchor).isActive = true

        nameTextField.widthAnchor.constraint(equalTo: inputsContainerView.widthAnchor).isActive = true
        nameTextFieldHeightAnchor = nameTextField.heightAnchor.constraint(equalTo: inputsContainerView.heightAnchor, multiplier: 1/3)
        nameTextFieldHeightAnchor?.isActive = true

        //need x, y, width, height constraints
        nameSeparatorView.leftAnchor.constraint(equalTo: inputsContainerView.leftAnchor).isActive = true
        nameSeparatorView.topAnchor.constraint(equalTo: nameTextField.bottomAnchor).isActive = true
        nameSeparatorView.widthAnchor.constraint(equalTo: inputsContainerView.widthAnchor).isActive = true
        nameSeparatorView.heightAnchor.constraint(equalToConstant: 1).isActive = true

        //need x, y, width, height constraints
        emailTextField.leftAnchor.constraint(equalTo: inputsContainerView.leftAnchor, constant: 12).isActive = true
        emailTextField.topAnchor.constraint(equalTo: nameTextField.bottomAnchor).isActive = true

        emailTextField.widthAnchor.constraint(equalTo: inputsContainerView.widthAnchor).isActive = true

        emailTextFieldHeightAnchor = emailTextField.heightAnchor.constraint(equalTo: inputsContainerView.heightAnchor, multiplier: 1/3)

        emailTextFieldHeightAnchor?.isActive = true

        //need x, y, width, height constraints
        emailSeparatorView.leftAnchor.constraint(equalTo: inputsContainerView.leftAnchor).isActive = true
        emailSeparatorView.topAnchor.constraint(equalTo: emailTextField.bottomAnchor).isActive = true
        emailSeparatorView.widthAnchor.constraint(equalTo: inputsContainerView.widthAnchor).isActive = true
        emailSeparatorView.heightAnchor.constraint(equalToConstant: 1).isActive = true

        //need x, y, width, height constraints
        passwordTextField.leftAnchor.constraint(equalTo: inputsContainerView.leftAnchor, constant: 12).isActive = true
        passwordTextField.topAnchor.constraint(equalTo: emailTextField.bottomAnchor).isActive = true

        passwordTextField.widthAnchor.constraint(equalTo: inputsContainerView.widthAnchor).isActive = true
        passwordTextFieldHeightAnchor = passwordTextField.heightAnchor.constraint(equalTo: inputsContainerView.heightAnchor, multiplier: 1/3)
        passwordTextFieldHeightAnchor?.isActive = true
    }

    func setupLoginRegisterButton() {
        //need x, y, width, height constraints
        loginRegisterButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        loginRegisterButton.topAnchor.constraint(equalTo: inputsContainerView.bottomAnchor, constant: 12).isActive = true
        loginRegisterButton.widthAnchor.constraint(equalTo: inputsContainerView.widthAnchor).isActive = true
        loginRegisterButton.heightAnchor.constraint(equalToConstant: 50).isActive = true
    }

    override var preferredStatusBarStyle : UIStatusBarStyle {
        return .lightContent
    }
}

extension UIColor {

    convenience init(r: CGFloat, g: CGFloat, b: CGFloat) {
        self.init(red: r/255, green: g/255, blue: b/255, alpha: 1)
    }



}

Answer 1

第 1 步：

在代码中的某处创建 activity 指标。特别是 viewDidLoad 如果您想以编程方式创建它，或者如果您想以编程方式显示带有警报设计的 activity 指标。

步骤 2： 显示 activity 指标

有一个像 login 或 register 这样的按钮。在那里您将开始显示 activity 指示器并启动它的动画。

步骤 3： 隐藏 activity 指标

您将在 FIRAuth.auth()?.signIn..... 登录完成处理程序中隐藏 activity 指示器。就像

[indicator stopAnimating];
[indicator isHidden:YES];

该登录方式有两种情况。一个是错误，另一个是成功。最好向用户或其他东西显示错误警报。希望您会发现此解决方案有帮助。 :)

Answer 2

要显示 activity 指标，首先在 class 级别声明它，然后初始化它。

 var activityIndicator:UIActivityIndicatorView!

然后在您的 viewdidLoad() 方法中，初始化 activityIndicator。

 activityIndicator =  UIActivityIndicatorView(activityIndicatorStyle: .gray)
 activityIndicator.center = view.center
 activityIndicator.isHidden = true
 self.view.addSubview(activityIndicator)

您可以在视图控制器中编写两种方法来启动和停止 activity 指示器：

  func displayActivityIndicatorView() -> () {
    UIApplication.shared.beginIgnoringInteractionEvents()
    self.view.bringSubview(toFront: self.activityIndicator)
    self.activityIndicator.isHidden = false
    self.activityIndicator.startAnimating()
  }

   func hideActivityIndicatorView() -> () {
     if !self.activityIndicator.isHidden{
        DispatchQueue.main.async {
            UIApplication.shared.endIgnoringInteractionEvents()
            self.activityIndicator.stopAnimating()
            self.activityIndicator.isHidden = true

        }
    }

  }

现在在验证登录数据之后和点击登录 API 之前启动 activity 指标：

 func handleLogin() {
    guard let email = emailTextField.text, let password = passwordTextField.text else {
        print("Form is not valid")
        return
    }
    //start activity indicator
    self. displayActivityIndicatorView()
    FIRAuth.auth()?.signIn(withEmail: email, password: password, completion: { (user, error) in

        if error != nil {
            print(error ?? "")
            //stop activity indicator
            self. hideActivityIndicatorView()
            return
        }

        //successfully logged in our user
            //stop activity indicator
            self. hideActivityIndicatorView()
        self.messagesController?.fetchUserAndSetupNavBarTitle()

        self.dismiss(animated: true, completion: nil)

    })

}

Answer 3

您可以使用下面的代码。

  let alert = UIAlertController(title: nil, message: "Please wait...", preferredStyle: .alert)

    alert.view.tintColor = UIColor.black
    let loadingIndicator: UIActivityIndicatorView = UIActivityIndicatorView(frame: CGRect(x:10, y:5, width:50, height:50)) as UIActivityIndicatorView
    loadingIndicator.hidesWhenStopped = true
    loadingIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.gray
     loadingIndicator.color = UIColor(red: 255.0/255, green: 65.0/255, blue: 42.0/255,alpha : 1.0)
    loadingIndicator.startAnimating();

    alert.view.addSubview(loadingIndicator)
    present(alert, animated: true, completion: nil)

///dismisss///
dismiss(animated: false, completion: nil)

当用户使用 swift 注册或登录 messageView 时，我如何使用 activity 指示器 3

How can i use activity indicator when a user registers or login messageView using swift 3

ios

firebase

swift3

xcode8

uiactivityindicatorview