ios - 带有文本字段的 UiTableView - 出现键盘时滚动

Question

我正在一个 TableView Controller 中创建一个带有文本字段的表单。在为字段输入值后按下返回键时，我试图在这里实现两件事:

1) 将光标移动到下一个字段2) 向上滚动表格 View

我的代码可以将光标移动到下一个字段，但滚动部分不起作用。你能告诉我我在这里缺少什么吗？我研究了有关堆栈溢出的类似问题，并遵循了他们的建议，但仍然面临问题。感谢您的意见。

- (BOOL)textFieldShouldReturn:(UITextField *)textField{

    if ([textField isEqual:self.firstName]){
    //Move cursor to next field
    [self.lastName becomeFirstResponder];

    //scroll    
    id cellContainingFirstResponder = textField.superview.superview ;
    NSIndexPath *currentRowIndexPath = [self.signUpTable indexPathForCell:cellContainingFirstResponder];
    NSIndexPath *nextRowIndexPath = [NSIndexPath indexPathForRow:currentRowIndexPath.row+1 inSection:currentRowIndexPath.section];
    [self.signUpTable scrollToRowAtIndexPath:nextRowIndexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

if ([textField isEqual:self.lastName]){
    //Move cursor to next field
    [self.emailId becomeFirstResponder];

    //scroll
    id cellContainingFirstResponder = textField.superview.superview ;
    NSIndexPath *currentRowIndexPath = [self.signUpTable indexPathForCell:cellContainingFirstResponder];
    NSIndexPath *nextRowIndexPath = [NSIndexPath indexPathForRow:currentRowIndexPath.row+1 inSection:currentRowIndexPath.section];
    [self.signUpTable scrollToRowAtIndexPath:nextRowIndexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

if ([textField isEqual:self.emailId]){

    //Move cursor to next field
    [self.phoneNumber becomeFirstResponder];

    //scroll
    id cellContainingFirstResponder = textField.superview.superview ;
    NSIndexPath *currentRowIndexPath = [self.signUpTable indexPathForCell:cellContainingFirstResponder];
    NSIndexPath *nextRowIndexPath = [NSIndexPath indexPathForRow:currentRowIndexPath.row+1 inSection:currentRowIndexPath.section];
    [self.signUpTable scrollToRowAtIndexPath:nextRowIndexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

if ([textField isEqual:self.phoneNumber]){

    //Move cursor to next field
    [self.password becomeFirstResponder];

    //scroll
    id cellContainingFirstResponder = textField.superview.superview ;
    NSIndexPath *currentRowIndexPath = [self.signUpTable indexPathForCell:cellContainingFirstResponder];
    NSIndexPath *nextRowIndexPath = [NSIndexPath indexPathForRow:currentRowIndexPath.row+1 inSection:currentRowIndexPath.section];
    [self.signUpTable scrollToRowAtIndexPath:nextRowIndexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];

}

// This is the last field hence dismiss keyboard -> This part is working
if ([textField isEqual:self.password]){
    [textField resignFirstResponder];

}

return YES ;

}

Answer 1

要根据文本字段的焦点向上滚动表格 View ，请尝试以下操作:

- (void) textFieldDidBeginEditing:(UITextField *)textField {
    UITableViewCell *cell = (UITableViewCell*) [[textField superview] superview];
    [yourTableView scrollToRowAtIndexPath:[yourTableView indexPathForCell:cell] atScrollPosition:UITableViewScrollPositionMiddle animated:YES];   
}

在这里，您可以使用 UITableViewScrollPositionTop 将滚动位置设置为顶部

您可能想知道为什么要为 textfield 使用两个 super View 。一个用于 UITableViewCellContentView，另一个用于 UITableViewCell，以便您可以获取表格的当前/焦点单元格的实例。

它有效，我们已经在我们的一个项目中使用过它