ContentInsets doesn't work for UITableView

Question

I have a text box in a TableView and when the user selects a switch it appears ( becomes visible) and a keyboard pops up, and when the user turns off the switch the TextBox disappears and keyboard hides. During the time when the keyboard appears and disappears I want to shift the tableView slightly up and then back to original position. Here is the code

-(IBAction)actionSwitch:(id)sender
{
isSearchTerm = [switchSearchTerm isOn];
[self.tableView reloadData];
if(isSearchTerm == YES)
{
    [txtSearchTerm becomeFirstResponder];
    floatBottom = self.tableView.contentInset.bottom;

    self.tableView.contentInset=UIEdgeInsetsMake(0,0,200,0);
    [self.tableView scrollToRowAtIndexPath:[self.tableView indexPathForSelectedRow] atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
else
{
    [txtSearchTerm resignFirstResponder];
    self.tableView.contentInset=UIEdgeInsetsMake(0,0,floatBottom,0);
    [self.tableView scrollToRowAtIndexPath:[self.tableView indexPathForSelectedRow] atScrollPosition:UITableViewScrollPositionBottom animated:YES];
}
}

The else part doesn't bring the tableview back to its original position, please help.

Answer 1

If your tableView lies in a navigation controller or the rootViewController of a navigation controller and you are doing all this on iOS7+ with UIViewController 's property automaticallyAdjustsScrollViewInsets set to YES. You'd better handle the keyboard appear as the document suggested

// Call this method somewhere in your view controller setup code.
- (void)registerForKeyboardNotifications
{
    [[NSNotificationCenter defaultCenter] addObserver:self
            selector:@selector(keyboardWasShown:)
            name:UIKeyboardDidShowNotification object:nil];

   [[NSNotificationCenter defaultCenter] addObserver:self
             selector:@selector(keyboardWillBeHidden:)
             name:UIKeyboardWillHideNotification object:nil];

}

// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification
{
    NSDictionary* info = [aNotification userInfo];
    CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

    UIEdgeInsets contentInsets = UIEdgeInsetsMake(0.0, 0.0, kbSize.height, 0.0);
    scrollView.contentInset = contentInsets;
    scrollView.scrollIndicatorInsets = contentInsets;

    // If active text field is hidden by keyboard, scroll it so it's visible
    // Your app might not need or want this behavior.
    CGRect aRect = self.view.frame;
    aRect.size.height -= kbSize.height;
    if (!CGRectContainsPoint(aRect, activeField.frame.origin) ) {
        [self.scrollView scrollRectToVisible:activeField.frame animated:YES];
    }
}

// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
    UIEdgeInsets contentInsets = UIEdgeInsetsZero;
    scrollView.contentInset = contentInsets;
    scrollView.scrollIndicatorInsets = contentInsets;
}

There is another way to do this. Both can be found in "Moving Content That Is Located Under the Keyboard" "Text Programming Guide for iOS"

Answer 2

我通过选择ViewController，通过在属性检查器中的视图控制器属性下将顶部栏属性下的扩展设置为NO来解决此问题。