diff --git a/Source/UIViewController+KNSemiModal.m b/Source/UIViewController+KNSemiModal.m
index acd17f2..533c8a3 100755
--- a/Source/UIViewController+KNSemiModal.m
+++ b/Source/UIViewController+KNSemiModal.m
@@ -305,6 +305,9 @@ -(void)updateBackground{
     [self kn_addOrUpdateParentScreenshotInView:overlay];
 }
 -(void)dismissSemiModalView {
+    SEL willDismissSelector = NSSelectorFromString(@"willDismissSemiModalView");
+    if ([self respondsToSelector:willDismissSelector])
+        [self performSelectorOnMainThread:willDismissSelector withObject:nil waitUntilDone:YES];
 	[self dismissSemiModalViewWithCompletion:nil];
 }