Question

我无法通过状态栏以白色显示时钟电池等。我在堆栈溢出时读了很多类似的问题，但大多数都是旧的，不是用swift编写的。我能找到的最新答案建议override func prefferedStatusBarStyle不再是一个功能。我尝试了以下方法，但它不起作用。

import Foundation
import UIKit
import MessageUI

class ContactUsViewController: MFMailComposeViewController {

    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }

    override func loadView() {
        super.loadView()
    }

    override func viewDidLoad() {
        print("mail viewDidLoad()")
        self.setNeedsStatusBarAppearanceUpdate()
    }

}

我使用。

调用视图控制器

if !MFMailComposeViewController.canSendMail() {
    print("Mail services are not available")
    return
}
self.timeSlider.removeFromSuperview()
let contactVC = ContactUsViewController()// MFMailComposeViewController()
contactVC.navigationBar.tintColor = UIColor.white
contactVC.mailComposeDelegate = self

// Configure the fields of the interface.
contactVC.setToRecipients(["support@example.com"])
contactVC.setSubject("Your subject here")
contactVC.setMessageBody("Enter message about bugs, problems, ideas how to make the app better etc.", isHTML: false)
contactVC.modalPresentationCapturesStatusBarAppearance = true
// Present the view controller
self.navigationController?.present(contactVC, animated: true, completion: nil)

视图控制器缺少哪些内容来更改其StatusBarStyle？

Answer 1

首先在应用信息列表中添加“查看基于控制器的状态栏外观”键，其值为NO

然后检查此代码

func showContactUs() {
   if !MFMailComposeViewController.canSendMail() {
      print("Mail services are not available")
      return
   }
   let contactVC = ContactUsViewController()

   //To make the nav bar stand out
   //contactVC.navigationBar.barStyle = .blackTranslucent

   contactVC.setToRecipients(["support@example.com"])
   contactVC.setSubject("Your subject here")
   contactVC.setMessageBody("Enter message about bugs, problems, ideas how to make the app better etc.", isHTML: false)
   present(contactVC, animated: true)
}


class ContactUsViewController: MFMailComposeViewController {

   override func viewDidAppear(_ animated: Bool) {
      super.viewDidAppear(animated)

      UIApplication.shared.statusBarStyle = .lightContent
   }

   override func viewDidDisappear(_ animated: Bool) {
      super.viewDidDisappear(animated)

      UIApplication.shared.statusBarStyle = .default
   }
}

更改MFMailComposeViewControllers状态栏样式

1 个答案: