MFMailComposeViewController视图闪烁问题

Question

当我显示MFMailComposeViewController时，它的视图闪烁(首先进入导航栏，然后下降到正确的位置)首先看起来像" to "字段进入导航栏，然后出来。我正在使用以下代码:'
self.resignFirstResponder ()自我。mailPicker = MFMailComposeViewController()

    self.mailPicker!.setToRecipients(self.mailer)
    self.mailPicker!.setSubject("hello");
    self.mailPicker!.setMessageBody("message text", isHTML: false);
    self.mailPicker!.mailComposeDelegate = self;
    self.mailPicker!.delegate = self
    self.presentViewController(self.mailPicker!, animated: true, completion: nil)`

Answer 1

尝试将此添加到视图控制器:

- (void)viewDidAppear:(BOOL)animated {
    [UINavigationBar appearance].translucent = NO;
    [super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated {
    [UINavigationBar appearance].translucent = YES;
    [super viewWillDisappear:animated];
}