默认ios邮件应用程序打开时关闭键盘

Question

在我的应用程序中，我显示MFMailComposeViewController以显示默认邮件应用程序。如何关闭在控制器中打开的键盘？

Answer 1

UIWindow* keyWindow = [[UIApplication sharedApplication] keyWindow];
UIView* firstResponder = [keyWindow performSelector:@selector(firstResponder)];
[firstResponder resignFirstResponder];

我希望这会帮助你.. :)

Answer 2

在viewcontroller.h添加：

@property (nonatomic) UITapGestureRecognizer *tapRecognizer;

现在在.m文件中，将其添加到ViewDidLoad函数：

    - (void)viewDidLoad 
{
        [super viewDidLoad];

        //Keyboard stuff
        tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
        tapRecognizer.cancelsTouchesInView = NO;
        [self.view addGestureRecognizer:tapRecognizer];
    }*

另外，在.m文件中添加此功能：

- (void)handleSingleTap:(UITapGestureRecognizer *) sender
{
    [self.view endEditing:YES];
}

Answer 3

不幸的是，即使我们尝试使用endEditing;强制关闭键盘，该功能也不起作用。在我的设备上，它似乎不会被解雇。

以下应该是应该有效的答案： 完成后显示MFMailComposeViewController，然后在endEditing:的视图中致电MFMailComposeViewController。

MFMailComposeViewController *mailVC = [[MFMailComposeViewController alloc] init];
[self presentViewController:mailVC animated:YES completion:^{ 
     [mailVC.view endEditing:YES];
}];

的更新：

不建议这样做但是，这是一种有效的hackish方式：

目标-C：

MFMailComposeViewController *mailVC = [[MFMailComposeViewController alloc] init];
[self presentViewController:mailVC animated:YES completion:^{
      UITextField *a = [[UITextField alloc] init];
      [mailVC.view addSubview:a];
      [a becomeFirstResponder];
      [mailVC.view endEditing:YES];
}];

夫特：

let mailVC = MFMessageComposeViewController()
self.presentViewController(mailVC, animated: true) { () -> Void in
       let a = UITextField()
       mailVC.view.addSubview(a)
       a.becomeFirstResponder()
       mailVC.view.endEditing(true)
}