diff --git a/NoticeView/WBNoticeView/WBNoticeOperation.m b/NoticeView/WBNoticeView/WBNoticeOperation.m
index ad6abca..4c62225 100644
--- a/NoticeView/WBNoticeView/WBNoticeOperation.m
+++ b/NoticeView/WBNoticeView/WBNoticeOperation.m
@@ -17,6 +17,9 @@ @interface WBNoticeOperation ()
 @end
 
 @implementation WBNoticeOperation
+@synthesize executing;
+@synthesize cancelled;
+@synthesize finished;
 
 - (void)start
 {
diff --git a/NoticeView/WBNoticeView/WBNoticeView.h b/NoticeView/WBNoticeView/WBNoticeView.h
index 8537b4f..be6d972 100644
--- a/NoticeView/WBNoticeView/WBNoticeView.h
+++ b/NoticeView/WBNoticeView/WBNoticeView.h
@@ -8,10 +8,10 @@
 
 #import <Foundation/Foundation.h>
 
-typedef enum WBNoticeViewSlidingMode {
+typedef NS_ENUM(NSUInteger, WBNoticeViewSlidingMode)  {
     WBNoticeViewSlidingModeUp,
     WBNoticeViewSlidingModeDown,
-} WBNoticeViewSlidingMode;
+};
 
 /**
  `WBNoticeView` objects provides a lightweight, non-intrusive means for displaying information to the user. The `WBNoticeView` class is an abstract class that encapsulates the interface common to all notice objects.
diff --git a/NoticeView/WBNoticeView/WBNoticeView.m b/NoticeView/WBNoticeView/WBNoticeView.m
index 2dec11d..e9ca98f 100644
--- a/NoticeView/WBNoticeView/WBNoticeView.m
+++ b/NoticeView/WBNoticeView/WBNoticeView.m
@@ -78,6 +78,10 @@ - (BOOL)isEqual:(WBNoticeView *)object
     return [self.title isEqual:object.title] && [self.message isEqual:object.message];
 }
 
+- (NSUInteger)hash {
+    return [self.title hash] + [self.message hash];
+}
+
 #pragma mark -
 
 - (void)displayNotice
@@ -120,10 +124,7 @@ - (void)displayNotice
         [self registerObserver];
     } completion:^ (BOOL finished) {
         // if it's not sticky, hide it automatically
-        if ((self.tapToDismissEnabled && !self.isSticky) || (!self.tapToDismissEnabled && self.isSticky)) {
-            // Schedule a timer
-            self.displayTimer = [NSTimer scheduledTimerWithTimeInterval:self.delay target:self selector:@selector(dismissAfterTimerExpiration) userInfo:nil repeats:NO];
-        } else if (!self.isSticky) {
+        if (!self.isSticky) {
             // Display for a while, then hide it again
             [self dismissNoticeWithDuration:self.duration delay:self.delay hiddenYOrigin:self.hiddenYOrigin];
         }