Textfields under keyboard

Question

In my app there are few forms. Sometimes keyboard hides fields so user can't see what he it typing. For that case I found way to move view or scrollview up so textfields stays above keyboard. Problem is that on iPhone 5 I need to move view up for last 3 textfields but for iPhone 6 - only for the last textfield.

Of corse I can define all cases of fields and device screen height values. But I want to find more elegant solution to detect is texfield is under the keyboard on current device and is it necessary to move view?

Answer 1

Use TPKeyboardAvoidingScrollView . Its easy to use

drop the TPKeyboardAvoidingScrollView.m and TPKeyboardAvoidingScrollView.h source files into your project, pop a UIScrollView into your view controller's xib, set the scroll view's class to TPKeyboardAvoidingScrollView, and put all your controls within that scroll view. You can also create it programmatically, without using a xib - just use the TPKeyboardAvoidingScrollView as your top-level view.

Answer 2

There is a great help guide by Apple here

You need to listen to keyboard notifications like

// 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;
}

Answer 3

You can detect which UITextField is the "Active" one by using its delegate method - (void)textFieldDidBeginEditing:(UITextField *)textField .

Use textField.frame to calculate the offset you need to set for scrollView.contentOffset . In the - textFieldDidBeginEditing: method you can reset the contentOffset = CGPointZero