ios - UIActivityViewController 中缺少取消按钮文本

Question

我有一个用 Swift 编写的 iOS 应用程序，并且 UIActivityViewController 中的“取消”按钮缺少文本。该按钮是全白色的。有什么想法吗？

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

Answer 1

您应该添加“取消按钮”作为单独的操作

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