UIActivityViewController中的取消按鈕文本丟失

我有一個用Swift編寫的iOS應用程序，並且UIActivityViewController中的取消按鈕缺少其文本。按鈕全白。有任何想法嗎？UIActivityViewController中的取消按鈕文本丟失

func photoEditViewController(_ photoEditViewController: PhotoEditViewController, didSave image: UIImage, and data: Data) { 

    let objectsToShare: [AnyObject] = [ image ] 
    let activityViewController = UIActivityViewController(activityItems: objectsToShare, applicationActivities: nil) 
    activityViewController.popoverPresentationController?.sourceView = self.window?.rootViewController?.view 
    activityViewController.completionWithItemsHandler = { activity, success, items, error in 
     if success { 
      let alertController = UIAlertController(title: "Done", message: "Thanks for share!", preferredStyle: .alert) 
      let okBtn = UIAlertAction(title: "OK", style: .default, handler: nil) 
      alertController.addAction(okBtn) 
      self.topMostController().present(alertController, animated: true, completion: nil) 
     } 
    } 
    topMostController().present(activityViewController, animated: true, completion: {() in 

    }) 

} 


func topMostController() -> UIViewController { 
    var topController: UIViewController = UIApplication.shared.keyWindow!.rootViewController! 
    while (topController.presentedViewController != nil) { 
     topController = topController.presentedViewController! 
    } 
    return topController 
}

image here

來源

2017-01-18 TUANANH VUONG

okBtn後添加此，並將其添加到警報控制器讓cancelBtn = UIAlertAction（標題：「取消」，風格：.cancel，處理：無） –

您應該添加 '取消按鈕' 作爲一個單獨的行動

let cancelBtn = UIAlertAction(title: "Cancel", style: .cancel, handler: nil) 
alertController.addAction(cancelBtn)

來源

2017-01-18 11:16:34

你有沒有設置

UIButton.appearance().tintColor = UIColor.white

這就是我所做的。

來源

2017-05-25 11:29:32

[[UIBarButtonItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor whiteColor]} forState:UIControlStateNormal]; 
[[UIBarButtonItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor whiteColor]} forState:UIControlStateHighlighted];

來源

2017-11-10 19:29:18

UIActivityViewController中的取消按鈕文本丟失

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