模态呈现的viewcontroller的透明背景

Question

我正在使用Parse和ParseUI.我希望我的PFLoginViewController子类具有透明背景.将来,我想对背景进行模糊观察.

但是......一旦完成PFLoginViewController的动画制作,背景就变黑了......在动画期间,背景是透明的.

func presentLogin() {
    var loginViewController = LoginViewController()
    var signupViewController = SignUpViewController()

    loginViewController.fields = .UsernameAndPassword | .LogInButton | .PasswordForgotten | .SignUpButton | PFLogInFields.DismissButton
    signupViewController.fields = .UsernameAndPassword | .Email | .DismissButton | .SignUpButton
    loginViewController.delegate = self
    loginViewController.logInView.backgroundColor = UIColor.clearColor()
    loginViewController.logInView.opaque = false
    signupViewController.delegate = self

    loginViewController.signUpController = signupViewController

    self.presentViewController(loginViewController, animated: true) { () -> Void in
        //
    }
}

我的logincontroller使用的子类:

class LoginViewController: PFLogInViewController {

    @IBOutlet weak var _nmcLogoLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        let userName = SettingsManager.userName
        let password = SettingsManager.password

        self.logInView.usernameField.text = userName
        self.logInView.passwordField.text = password

        NSBundle.mainBundle().loadNibNamed("LoginViewBranding", owner: self, options: nil)[0] as? UIView

        self.logInView.logo = _nmcLogoLabel

    }

}

我怎样才能让它透明？

Ps将clearColor应用于子类中的backgroundColor没有任何区别

Answer 1

固定它.

问题是presentViewController没有保留我所覆盖的视图.

__CODE__ 做了伎俩.

Answer 2

部分解决方案隐藏在问题中.你需要三条线来使背景透明,即.isOpaque = false backgroundColor = .clear并设置modalPresentationStyle

这是完整的解决方案.在调用View Controller中,调用此函数:

func presentModal() {
    let modalController = ModalViewController()
    modalViewController.modalPresentationStyle = .overCurrentContext
    present(modalViewController, animated: true, completion: nil)
}

并在ModalViewController's viewDidLoad():

override func viewDidLoad() {
    super.viewDidLoad()

    view.isOpaque = false
    view.backgroundColor = .clear // try other colors, say: .white or black with Alpha etc.
}

Answer 3

与所选答案相同,但通过IB直观地看到:

Answer 4

我有两个视图控制器，第一次登录和第二次忘记密码。最初，点击忘记密码按钮即可看到登录屏幕，忘记密码屏幕将以透明背景显示在登录屏幕上。

在登录屏幕中，我使用以下代码为forgetButtonAction 呈现forgetPasswordViewController

   let vc = UIStoryboard.init(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "forgotPasswordViewController") as! forgotPasswordViewController
    vc.modalPresentationStyle = .overCurrentContext
    present(vc, animated: true, completion: nil)

而且还在forgotPasswordViewController中，在ViewDidLoad方法下，我必须通过以下代码更改视图背景颜色和不透明状态

   override func viewDidLoad() {
    super.viewDidLoad()
    view.isOpaque = false
    view.backgroundColor = .clear
   }