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课程中......
//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 @"RecipientTextField" 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,在您呈现 MFMailComposeViewController 之后,将 MFMailComposeViewController 的视图与您希望成为第一响应者的字段一起传递给函数。
MFMailComposeViewController *mailComposer = [[MFMailComposeViewController alloc] init];
mailComposer.mailComposeDelegate = self;
/*Set up the mail composer*/
[self presentModalViewController:mailComposer animated:YES];
[self setMFMailFieldAsFirstResponder:mailComposer.view mfMailField:@"RecipientTextField"];
[mailComposer release];