If one of the constraint items is a layout guide - the constraint will subtract it's length. #8

Author: markst

KeyboardConstraint/KeyboardAdjustConstraint.m

@@ -59,6 +59,18 @@ - (void)_keyboardDidChangeVisible:(NSNotification *)notification
         keyboardHeight = intersection.size.height;
     }
 
+    // If one of the constraint items is a layout guide; subtract it's length:
+    
+    if (notification.name == UIKeyboardWillShowNotification) {
+        if ([self.firstItem conformsToProtocol:@protocol(UILayoutSupport)]) {
+            id<UILayoutSupport> layoutGuide = self.firstItem;
+            keyboardHeight -= layoutGuide.length;
+        } else if ([self.secondItem conformsToProtocol:@protocol(UILayoutSupport)]) {
+            id<UILayoutSupport> layoutGuide = self.secondItem;
+            keyboardHeight -= layoutGuide.length;
+        }
+    }
+
     if (superview) {
         //Force layout before animation...
         [CATransaction begin];