iphone - 关注电子邮件中的 ToReciepient 字段 - iphone

Question

打开应用内电子邮件时，是否可以默认将键盘聚焦在“收件人”字段上？如果是，那么我们如何访问电子邮件中的“收件人”字段？

任何实现目标的途径都会受到赞赏。

Answer 1

您可以使这些字段成为第一响应者。

如果您将以下方法添加到您的类中...

//Returns true if the ToAddress field was found any of the sub views and made first responder
//passing in @"MFComposeSubjectView"     as the value for field makes the subject become first responder 
//passing in @"MFComposeTextContentView" as the value for field makes the body become first responder 
//passing in @"MFRecipientTextField"       as the value for field makes the to address field become first responder 
- (BOOL) setMFMailFieldAsFirstResponder:(UIView*)view mfMailField:(NSString*)field{
    for (UIView *subview in view.subviews) {

        NSString *className = [NSString stringWithFormat:@"%@", [subview class]];
        if ([className isEqualToString:field])
        {
            //Found the sub view we need to set as first responder
            [subview becomeFirstResponder];
            return YES;
        }

        if ([subview.subviews count] > 0) {
            if ([self setMFMailFieldAsFirstResponder:subview mfMailField:field]){
                //Field was found and made first responder in a subview
                return YES;
            }
        }
    }

    //field not found in this view.
    return NO;
}

然后，在呈现 MFMailComposeViewController 后，将 MFMailComposeViewController 的 View 以及您想要成为第一响应者的字段传递到函数中。

MFMailComposeViewController *mailComposer = [[MFMailComposeViewController alloc] init];
mailComposer.mailComposeDelegate = self;

/*Set up the mail composer*/

[self presentModalViewController:mailComposer animated:YES];
[self setMFMailFieldAsFirstResponder:mailComposer.view mfMailField:@"MFRecipientTextField"];
[mailComposer release];

已编辑..