修改了sessionid为空的bug（方法调用时机有逻辑问题）

Example/Podfile.lock

@@ -28,7 +28,7 @@ PODS:
   - GMLibrary/Network (0.0.1):
     - AFNetworking (~> 2.6.1)
     - GMLibrary/Cache (~> 0.0.1)
-  - GMPhobos (0.1.1):
+  - GMPhobos (0.1.2):
     - GMLibrary (~> 0.0.1)
   - TMCache (2.1.0)
 
@@ -42,7 +42,7 @@ EXTERNAL SOURCES:
 SPEC CHECKSUMS:
   AFNetworking: cb8d14a848e831097108418f5d49217339d4eb60
   GMLibrary: c31039ad32bc93f866d6c3052c20acb8cf9c1568
-  GMPhobos: 8394056bb80461a7a653fded7b2e55966f8d86bb
+  GMPhobos: efde929e7f1030e9e94e4ec3bf76c632e51ff78e
   TMCache: 95ebcc9b3c7e90fb5fd8fc3036cba3aa781c9bed
 
 COCOAPODS: 0.39.0

Example/Pods/Local Podspecs/GMPhobos.podspec.json

 {
   "name": "GMPhobos",
-  "version": "0.1.1",
+  "version": "0.1.2",
   "summary": "GM statistic data sdk",
   "description": "GM event track sdk.",
   "homepage": "http://git.gengmei.cc/gengmeiios/GMPhobos",
@@ -10,7 +10,7 @@
   },
   "source": {
     "git": "http://git.gengmei.cc/gengmeiios/GMPhobos.git",
-    "tag": "0.1.1"
+    "tag": "0.1.2"
   },
   "platforms": {
     "ios": "7.0"

Example/Pods/Manifest.lock

@@ -28,7 +28,7 @@ PODS:
   - GMLibrary/Network (0.0.1):
     - AFNetworking (~> 2.6.1)
     - GMLibrary/Cache (~> 0.0.1)
-  - GMPhobos (0.1.1):
+  - GMPhobos (0.1.2):
     - GMLibrary (~> 0.0.1)
   - TMCache (2.1.0)
 
@@ -42,7 +42,7 @@ EXTERNAL SOURCES:
 SPEC CHECKSUMS:
   AFNetworking: cb8d14a848e831097108418f5d49217339d4eb60
   GMLibrary: c31039ad32bc93f866d6c3052c20acb8cf9c1568
-  GMPhobos: 8394056bb80461a7a653fded7b2e55966f8d86bb
+  GMPhobos: efde929e7f1030e9e94e4ec3bf76c632e51ff78e
   TMCache: 95ebcc9b3c7e90fb5fd8fc3036cba3aa781c9bed
 
 COCOAPODS: 0.39.0

Example/Pods/Pods.xcodeproj/xcshareddata/xcschemes/GMPhobos.xcscheme

@@ -14,7 +14,7 @@
             buildForArchiving = "YES">
             <BuildableReference
                BuildableIdentifier = 'primary'
-               BlueprintIdentifier = '6A2E46CFEEB8627AC4CB275A'
+               BlueprintIdentifier = '21F127F524A4A5E24D582BBA'
                BlueprintName = 'GMPhobos'
                ReferencedContainer = 'container:Pods.xcodeproj'
                BuildableName = 'GMPhobos.framework'>

Example/Pods/Target Support Files/GMPhobos/Info.plist

@@ -15,7 +15,7 @@
   <key>CFBundlePackageType</key>
   <string>FMWK</string>
   <key>CFBundleShortVersionString</key>
-  <string>0.1.1</string>
+  <string>0.1.2</string>
   <key>CFBundleSignature</key>
   <string>????</string>
   <key>CFBundleVersion</key>

GMPhobos.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = "GMPhobos"
-  s.version          = "0.1.1"
+  s.version          = "0.1.2"
   s.summary          = "GM statistic data sdk"
 
 # This description is used to generate tags and improve search results.
@@ -26,7 +26,7 @@ Pod::Spec.new do |s|
   # s.screenshots     = "www.example.com/screenshots_1", "www.example.com/screenshots_2"
   s.license          = 'MIT'
   s.author           = { "licong" => "licong@gmei.com" }
-  s.source           = { :git => "http://git.gengmei.cc/gengmeiios/GMPhobos.git", :tag => "0.1.1" }
+  s.source           = { :git => "http://git.gengmei.cc/gengmeiios/GMPhobos.git", :tag => "0.1.2" }
   # s.social_media_url = 'https://twitter.com/<TWITTER_USERNAME>'
 
   s.platform     = :ios, '7.0'

Pod/Classes/Phobos.m

@@ -58,6 +58,7 @@ static NSString *sdkVersion = @"110";
         _userId = 0;
         _appVersion = [self getAppVersion];
         [self setupNotification];
+        [self handleSessionStart];
         [self handleEventAfterInit];
         
         phobosLog(@"starts to orbit");
@@ -224,26 +225,24 @@ static NSString *sdkVersion = @"110";
     if (![self isNonEmpty:pageName]) {
         return;
     }
-    double enterTime = [[NSDate date] timeIntervalSince1970];
     _pageEnterParam = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                        pageName,@"page_name",
                        self.businessId,@"business_id",
                        self.refererPageName,@"referer",
-                       @(enterTime),@"in",nil];
+                       [self currentTime],@"in",nil];
 }
 
 - (void)onPageEnd{
-    double exitTime = [[NSDate date] timeIntervalSince1970];
     NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
     @try {
-        [dict setObject:@(exitTime) forKey:@"out"];
+        [dict setObject:[self currentTime] forKey:@"out"];
         [dict setObject:@([_pageEnterParam[@"in"] doubleValue]) forKey:@"in"];
         [dict setObject:_pageEnterParam[@"page_name"] forKey:@"page_name"];
         [dict setObject:_pageEnterParam[@"business_id"] forKey:@"business_id"];
         [dict setObject:_pageEnterParam[@"referer"] forKey:@"referer"];
         [dict setObject:@(NO) forKey:@"fake"];
         
-        [self track:@"PV" attributes:dict];
+        [self track:@"pv" attributes:dict];
         [_pageEnterParam removeAllObjects];
     }
     @catch (NSException *exception) {
@@ -370,7 +369,7 @@ static NSString *sdkVersion = @"110";
 - (NSString *)currentTime {
     NSDate *date = [NSDate date];
     NSTimeInterval interval = [date timeIntervalSince1970];
-    NSString *timeIntervalStr = [NSString stringWithFormat:@"%.0f",interval];
+    NSString *timeIntervalStr = [NSString stringWithFormat:@"%ld",(long)interval];
     return timeIntervalStr;
 }
 
@@ -391,7 +390,9 @@ static NSString *sdkVersion = @"110";
 }
 
 - (BOOL)isNonEmpty:(NSString *)string {
-    
+    if (!string) {
+        return NO;
+    }
     NSMutableCharacterSet *emptyStringSet = [[NSMutableCharacterSet alloc] init];
     [emptyStringSet formUnionWithCharacterSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
     [emptyStringSet formUnionWithCharacterSet: [NSCharacterSet characterSetWithCharactersInString: @"　"]];