ios - Facebook 登录按钮在不应该重叠的情况下重叠了事件指示器。 swift 4

Question

我已经在我的应用程序中实现了 Facebook 登录，并且运行良好。问题是，每次用户使用 facebook 或电子邮件登录时，我还在 super View 顶部的屏幕中心实现了一个事件指示器，尽管我已将 facebook 登录按钮放在 super View 上并且将事件指示器置于 super View 的前面，它在运行时与事件指示器重叠。我研究了很多，但没有弄清楚这一点。我的代码:

let activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .white)

override func viewDidLoad() {
    super.viewDidLoad()

    addActivityIndicator(activityIndicator)
    setupFBloginButton()

}

func setupFBloginButton() {
    var fbLoginButtonConstraints = [NSLayoutConstraint]()
    let buttonText = NSAttributedString(string: "Entrar com Facebook")
    let loginButton = FBSDKLoginButton()

    loginButton.translatesAutoresizingMaskIntoConstraints = false
    loginButton.removeConstraints(loginButton.constraints)
    loginButton.setAttributedTitle(buttonText, for: .normal)

    self.view.addSubview(loginButton)

    let leadingConstraint = loginButton.leadingAnchor.constraint(equalTo: self.view.leadingAnchor, constant: 10)
    let trailingConstraint = loginButton.trailingAnchor.constraint(equalTo: self.view.trailingAnchor, constant: -10)
    let heightContraint = loginButton.heightAnchor.constraint(equalToConstant: 40)
    let bottomConstraint = loginButton.bottomAnchor.constraint(equalTo: orLabel.topAnchor, constant: -20.0)
    fbLoginButtonConstraints.append(contentsOf: [leadingConstraint, trailingConstraint, bottomConstraint, heightContraint])

    NSLayoutConstraint.activate(fbLoginButtonConstraints)
    loginButton.delegate = self
}

func addActivityIndicator(_ activityIndicator: UIActivityIndicatorView) {

    activityIndicator.backgroundColor = UIColor(red:0.10, green:0.10, blue:0.10, alpha:0.5)
    activityIndicator.layer.cornerRadius = 8
    activityIndicator.frame = CGRect(x: 0, y: 0, width: 70, height: 70)
    activityIndicator.center = self.view.center
    self.view.addSubview(activityIndicator)
    activityIndicator.bringSubview(toFront: self.view)

}

正如你所看到的，我已经在 super View 的前面使用了bringSubview，但无论如何都不起作用。有什么想法吗？

Answer 1

您需要在父 View 上调用bringSubviewToFront。

 self.view.bringSubview(toFront:activityIndicator);