如果你使用UITableViewController而不是UIViewController，它会自动这样做。

如果你使用UITableViewController而不是UIViewController，它会自动这样做。

// scroll tableview so content ends at the middle of the tableview (out of the way of the keyboard)
CGPoint newContentOffset = CGPointMake(0, [self.tableView contentSize].height - (self.tableView.bounds.size.height / 2));
[self.tableView setContentOffset:newContentOffset animated:YES];

另一个简单的方法(只适用于一个部分)

//cellForRowAtIndexPath
UItextField *tf;
[cell addSubview:tf];
tf.tag = indexPath.row;
tf.delegate = self;

//textFieldDidBeginEditing:(UITextField *)text
[[self.tableView scrollToRowsAtIndexPath:[NSIndexPath indexPathForRow:text.tag in section:SECTIONINTEGER] animated:YES];

执行滚动的函数可以简单得多:

- (void) textFieldDidBeginEditing:(UITextField *)textField {
    UITableViewCell *cell;

    if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_6_1) {
    // Load resources for iOS 6.1 or earlier
        cell = (UITableViewCell *) textField.superview.superview;

    } else {
        // Load resources for iOS 7 or later
        cell = (UITableViewCell *) textField.superview.superview.superview; 
       // TextField -> UITableVieCellContentView -> (in iOS 7!)ScrollView -> Cell!
    }
    [tView scrollToRowAtIndexPath:[tView indexPathForCell:cell] atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

就是这样。根本不需要计算。

如果你能使用UITableViewController，你就能免费得到这个功能。然而，有时这不是一个选项，特别是当你需要多个视图而不仅仅是UITableView时。

这里介绍的一些解决方案在iOS≥4上不起作用，一些在iPad或横屏模式下不起作用，一些不适用于蓝牙键盘(我们不希望有任何滚动)，一些在多个文本字段之间切换时不起作用。因此，如果您选择任何解决方案，请确保测试这些情况。这是我们在InAppSettingsKit中使用的解决方案:

- (void)_keyboardWillShow:(NSNotification*)notification {
    if (self.navigationController.topViewController == self) {
        NSDictionary* userInfo = [notification userInfo];

        // we don't use SDK constants here to be universally compatible with all SDKs ≥ 3.0
        NSValue* keyboardFrameValue = [userInfo objectForKey:@"UIKeyboardBoundsUserInfoKey"];
        if (!keyboardFrameValue) {
            keyboardFrameValue = [userInfo objectForKey:@"UIKeyboardFrameEndUserInfoKey"];
        }

        // Reduce the tableView height by the part of the keyboard that actually covers the tableView
        CGRect windowRect = [[UIApplication sharedApplication] keyWindow].bounds;
        if (UIInterfaceOrientationLandscapeLeft == self.interfaceOrientation ||UIInterfaceOrientationLandscapeRight == self.interfaceOrientation ) {
            windowRect = IASKCGRectSwap(windowRect);
        }
        CGRect viewRectAbsolute = [_tableView convertRect:_tableView.bounds toView:[[UIApplication sharedApplication] keyWindow]];
        if (UIInterfaceOrientationLandscapeLeft == self.interfaceOrientation ||UIInterfaceOrientationLandscapeRight == self.interfaceOrientation ) {
            viewRectAbsolute = IASKCGRectSwap(viewRectAbsolute);
        }
        CGRect frame = _tableView.frame;
        frame.size.height -= [keyboardFrameValue CGRectValue].size.height - CGRectGetMaxY(windowRect) + CGRectGetMaxY(viewRectAbsolute);

        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:[[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue]];
        [UIView setAnimationCurve:[[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]];
        _tableView.frame = frame;
        [UIView commitAnimations];

        UITableViewCell *textFieldCell = (id)((UITextField *)self.currentFirstResponder).superview.superview;
        NSIndexPath *textFieldIndexPath = [_tableView indexPathForCell:textFieldCell];

        // iOS 3 sends hide and show notifications right after each other
        // when switching between textFields, so cancel -scrollToOldPosition requests
        [NSObject cancelPreviousPerformRequestsWithTarget:self];

        [_tableView scrollToRowAtIndexPath:textFieldIndexPath atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
    }
}

- (void) scrollToOldPosition {
  [_tableView scrollToRowAtIndexPath:_topmostRowBeforeKeyboardWasShown atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

- (void)_keyboardWillHide:(NSNotification*)notification {
    if (self.navigationController.topViewController == self) {
        NSDictionary* userInfo = [notification userInfo];

        [UIView beginAnimations:nil context:NULL];
        [UIView setAnimationDuration:[[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue]];
        [UIView setAnimationCurve:[[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey] intValue]];
        _tableView.frame = self.view.bounds;
        [UIView commitAnimations];

        [self performSelector:@selector(scrollToOldPosition) withObject:nil afterDelay:0.1];
    }
}   

以下是InAppSettingsKit中该类的完整代码。要测试它，请使用“Complete List”子窗格，您可以在其中测试上面提到的场景。