弹出键盘时，让table向上移动

#pragma mark UITextFieldDelegate

- (BOOL)textFieldShouldBeginEditing: (UITextField *)textField

{

[UIView beginAnimations: nil context: nil];

self.tableView.contentInset = UIEdgeInsetsMake(0, 0, 280, 0);

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:textField.tag - tag_index_cell_start inSection: 0];

[self.tableView scrollToRowAtIndexPath: indexPath atScrollPosition: UITableViewScrollPositionBottom

animated: YES];

[UIView commitAnimations];

return YES;

}