diff --git a/iOSViewHierarchy/iOSHierarchyViewer.m b/iOSViewHierarchy/iOSHierarchyViewer.m
index 83b1ee6..d96105a 100644
--- a/iOSViewHierarchy/iOSHierarchyViewer.m
+++ b/iOSViewHierarchy/iOSHierarchyViewer.m
@@ -5,6 +5,7 @@
 //
 
 #import <Foundation/NSURL.h>
+#import <UIKit/UIApplication.h>
 #import <sys/socket.h>
 #import <netinet/in.h>
 #import <ifaddrs.h>
@@ -30,6 +31,18 @@ @implementation iOSHierarchyViewer
 static HVHTTPServer *server = nil;
 static HVCoreDataHandler *coreDataHandler = nil;
 
+/// addObserver UIApplicationDidFinishLaunchingNotification auto start
+/// so don't need [iOSHierarchyViewer start] at applicationDidBecomeActive
+/// added by dengwu.wang
++(void)load{
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(start) name:UIApplicationDidFinishLaunchingNotification object:nil];
+}
+
+-(void)dealloc{
+    [super dealloc];
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+}
+
 + (void)logServiceAdresses
 {
   struct ifaddrs *interfaces = NULL;