在UITableViewCell的UITextField中，点 return时，光标移到上一个UITextField

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

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- (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];}

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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];

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