Making the view scrollable when keyboard appears - xcode

Question

Managed to get it on my first view, but doesnt work on second view.
Here's what I did on both view, with only a slight differencs for debugging purposes in console
-(void) viewWillAppear:(BOOL)animated {
//---registers the notifications for keyboard---
// to see if keyboard is shown / not shown
[[NSNotificationCenter defaultCenter]
addObserver: self
selector:#selector(keyboardDidShow:)
name:UIKeyboardDidShowNotification
object:self.view.window];
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:#selector(keyboardDidHide:)
name:UIKeyboardDidHideNotification
object:nil];
}
//---when the keyboard appears---
-(void) keyboardDidShow:(NSNotification *) notification {
if (keyboardIsShown) return;
NSLog(#"Keyboard is visible 1"); // debugger purpose "Keyboard is visible 2" on the second view.
NSDictionary* info = [notification userInfo];
//---obtain the size of the keyboard---
NSValue *aValue =
[info objectForKey:UIKeyboardFrameEndUserInfoKey];
CGRect keyboardRect =
[self.view convertRect:[aValue CGRectValue] fromView:nil];
//---resize the scroll view (with keyboard)---
CGRect viewFrame = [scrollview frame];
NSLog(#"%f", viewFrame.size.height);
viewFrame.size.height -= keyboardRect.size.height;
scrollview.frame = viewFrame;
NSLog(#"%f", keyboardRect.size.height);
NSLog(#"%f", viewFrame.size.height);
//---scroll to the current text field---
CGRect textFieldRect = [currentTextField frame];
[scrollview scrollRectToVisible:textFieldRect animated:YES];
keyboardIsShown = YES;
}
//---when the keyboard disappears---
-(void) keyboardDidHide:(NSNotification *) notification {
NSDictionary* info = [notification userInfo];
//---obtain the size of the keyboard---
NSValue* aValue =
[info objectForKey:UIKeyboardFrameEndUserInfoKey];
CGRect keyboardRect =
[self.view convertRect:[aValue CGRectValue] fromView:nil];
//---resize the scroll view back to the original size
// (without keyboard)---
CGRect viewFrame = [scrollview frame];
viewFrame.size.height += keyboardRect.size.height;
scrollview.frame = viewFrame;
keyboardIsShown = NO;
}
//---before the View window disappear---
-(void) viewWillDisappear:(BOOL)animated {
//---removes the notifications for keyboard---
[[NSNotificationCenter defaultCenter]
removeObserver: self
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter]
removeObserver:self
name:UIKeyboardWillHideNotification
object:nil];
}

Answer 1

You are registering for UIKeyboardDidShowNotification and UIKeyboardDidHideNotification notifications, and then deregistering for UIKeyboardWillShowNotification and UIKeyboardWillHideNotification notifications. There's your error.