fix third input problem

Author: fangborui

TPKeyboardAvoiding/UIScrollView+TPKeyboardAvoidingAdditions.m

@@ -42,10 +42,6 @@ - (TPKeyboardAvoidingState*)keyboardAvoidingState {
 - (void)TPKeyboardAvoiding_keyboardWillShow:(NSNotification*)notification {
     TPKeyboardAvoidingState *state = self.keyboardAvoidingState;
 
-    if ( state.keyboardVisible ) {
-        return;
-    }
-    
     UIView *firstResponder = [self TPKeyboardAvoiding_findFirstResponderBeneathView:self];
 
     state.keyboardRect = [self convertRect:[[[notification userInfo] objectForKey:_UIKeyboardFrameEndUserInfoKey] CGRectValue] fromView:nil];