IOS: UITextField+UITableView inside UIScrollView - ios

Question

I am new in iOS. I am making a chat application so I have a UITextField below the UITableView and UITextField and UITableView are inside the UIScrollView (I have disable the scroll in scrollview by self.scrollView.scrollEnabled = NO;).
When I tap on UITextField, the keyboard was shown, so I move the UITextField to above keyboard follow Managing the Keyboard doc
// 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);
self.scrollView.contentInset = contentInsets;
self.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, self.activeField.frame.origin) ) {
[self.scrollView scrollRectToVisible:self.activeField.frame animated:YES];
}
}
// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
UIEdgeInsets contentInsets = UIEdgeInsetsZero;
self.scrollView.contentInset = contentInsets;
self.scrollView.scrollIndicatorInsets = contentInsets;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
self.activeField = textField;
}
- (void)textFieldDidEndEditing:(UITextField *)textField
{
self.activeField = nil;
}
With this code, my TextField move to above keyboard successful
But the problem is: In the TableView, when the keyboard was shown I cannot scroll to see some items on top (about 2 items).
For example, if my tableview have 10items, when the keyboard was shown, i can only see 8items, 2 rest items still exist but I cannot scroll to them
Here is my Demo Project
I think maybe the content inset of UITableView is wrong but I don't know how to fix it.
Any help would be great appreciated

Answer 1

Use Autolayout insteads of contentInsets
In ViewController.h
#property (weak, nonatomic) IBOutlet NSLayoutConstraint *botConstraint;
In ViewController.m
- (void)keyboardWasShown:(NSNotification*)aNotification
{
NSDictionary* info = [aNotification userInfo];
CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
self.botConstraint.constant = kbSize.height;
[self.view layoutIfNeeded];
//...
}
// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
self.botConstraint.constant = 0.0f;
[self.view layoutIfNeeded];
//...
}
botConstraint is UITextField/UITableView/UIScrollView .bottom = fatherView.bottom in your Main.storyboard