出现键盘时 MFMailComposeViewController didFinishWithResult 问题

Question

我有一个 MFMailComposeViewController 的标准实现。

我已经设置了正确的委托协议，并且在 didFinishWithResult 方法上发生了日志。

参见：

mailComposer = [[MFMailComposeViewController alloc] init];
[mailComposer setSubject:emailTitle];
[mailComposer setMessageBody:messageBody isHTML:YES];
mailComposer.mailComposeDelegate = self;

[[self getController] presentViewController:mailComposer animated:YES completion:NULL];

- (void) mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
    NSLog(@"mail dismiss");
    [[self getController] dismissViewControllerAnimated:YES completion:NULL];
}

邮件编辑器正确显示，一切正常。意思是，如果我按下 "cancel" 按钮，则会调用 didFinishWithResult 方法并关闭 mailComposer。

但是，如果我尝试键入任何内容，例如 TO: 电子邮件地址，或邮件编辑器本身中的任何其他内容，感觉键盘出现正在删除我的视图控制器的委托操作, 因为 "cancel" 和 "send" 按钮不触发任何动作.

有什么想法吗？这让我发疯：/

干杯

编辑

这是 getController 的代码：

- (UIViewController *) getController
{
    Class vcc = [UIViewController class];

    UIResponder *responder = self;
    while ((responder = [responder nextResponder]))
        if ([responder isKindOfClass: vcc])
            return (UIViewController *)responder;

    return nil;
}

Answer 1

像这样设置一个开关来捕获来自邮件编辑器的结果：

-(void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error {
    switch (result) {
        case MFMailComposeResultCancelled:
            // User tapped cancel button
            break;
        case MFMailComposeResultSaved:
            // User saved email
            break;
        case MFMailComposeResultSent:
            // User sent email
            break;
        case MFMailComposeResultFailed:
            break;
        default:
            break;
    }
    [self dismissViewControllerAnimated:YES completion:NULL];
}

Answer 2

当 UITextField 成为 FirstResponder 时，您的控制器将收到 resignFirstResponder。

为什么要使用方法"getController"？在显示 MFMailComposeViewController.

的 ViewController 上创建属性

Answer 3

我推荐这个实现：

- (void) presentMailViewController
    if([MFMailComposeViewController canSendMail])
    {
        MFMailComposeViewController *mail = [MFMailComposeViewController new];
        mail.mailComposeDelegate = self;
        mail.navigationBar.tintColor = self.navigationController.navigationBar.tintColor;;
        [self.navigationController presentViewController:mail animated:YES completion:nil];
    }   
}

- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
    if(error)
    {
       //...
    }
    [self dismissViewControllerAnimated:YES completion:nil];
}

我建议您阅读此页面： Code Naming Basics

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