在UITableViewCell的UITextField中，点 return时，光标移到下一个UITextField

- (IBAction)textFieldDone:(id)sender {
    //[sender resignFirstResponder];
    UITableViewCell *cell = (UITableViewCell *)[[sender superview] superview];//sender是文本字段，它是表单元视图的内容视图的一个子视图,[cell.contentView addSubview: textField];
    UITableView *table = (UITableView *)[cell superview];
    NSIndexPath *textFieldIndexPath = [table indexPathForCell:cell];
    NSUInteger row = [textFieldIndexPath row];
    row++;
    if (row >= kNumberOfEditableRows) {
        row = 0;
    }
    NSIndexPath *newPath = [NSIndexPath indexPathForRow:row inSection:0];
    UITableViewCell *nextCell = [self.tableView cellForRowAtIndexPath:newPath];
    UITextField *nextField = nil;
    for (UIView *oneView in nextCell.contentView.subviews) {
        if ([oneView isMemberOfClass:[UITextField class]]) {
            nextField = (UITextField *)oneView;
        }
    }
    [nextField becomeFirstResponder];
}

UITextField *textField = [[UITextField alloc] initWithFrame: CGRectMake(90, 12, 200, 25)];
        textField.clearsOnBeginEditing = NO;//鼠标点上时，不清空
        [textField setDelegate: self];
        //textField.returnKeyType = UIReturnKeyDone;
        [textField addTarget:self action:@selector(textFieldDone:) forControlEvents:UIControlEventEditingDidEndOnExit];//把DidEndOnExit事件响应为 textfieldDone: 方法
        [cell.contentView addSubview: textField];