Make compatible with iOS Extensions

Amplitude.xcodeproj/project.pbxproj

@@ -501,6 +501,7 @@
 		E98C05351A48E7FE00800C63 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
 				FRAMEWORK_SEARCH_PATHS = "$(inherited)";
 				OTHER_LDFLAGS = "-ObjC";
@@ -512,6 +513,7 @@
 		E98C05361A48E7FE00800C63 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
 				FRAMEWORK_SEARCH_PATHS = "$(inherited)";
 				OTHER_LDFLAGS = "-ObjC";

Amplitude/Amplitude.m

@@ -455,12 +455,16 @@ - (void)initializeApiKey:(NSString*) apiKey userId:(NSString*) userId setUserId:
         }
     }];
 
-    UIApplicationState state = [UIApplication sharedApplication].applicationState;
-    if (state != UIApplicationStateBackground) {
+    UIApplication * app = [self getSharedApplication];
+    if (app) {
+      UIApplicationState state = app.applicationState;
+      if (state != UIApplicationStateBackground) {
         // If this is called while the app is running in the background, for example
         // via a push notification, don't call enterForeground
         [self enterForeground];
+      }
     }
+
     _initialized = YES;
 }
 
@@ -485,6 +489,15 @@ - (BOOL)runOnBackgroundQueue:(void (^)(void))block
     }
 }
 
+- (UIApplication *)getSharedApplication
+{
+  Class UIApplicationClass = NSClassFromString(@"UIApplication");
+  if (UIApplicationClass && [UIApplicationClass respondsToSelector:@selector(sharedApplication)]) {
+    return [UIApplication performSelector:@selector(sharedApplication)];
+  }
+  return nil;
+}
+
 #pragma mark - logEvent
 
 - (void)logEvent:(NSString*) eventType
@@ -961,7 +974,7 @@ - (void)makeEventUploadPostRequest:(NSString*) url events:(NSString*) events max
             }
 
             // Upload finished, allow background task to be ended
-            [[UIApplication sharedApplication] endBackgroundTask:_uploadTaskID];
+            [[self getSharedApplication] endBackgroundTask:_uploadTaskID];
             _uploadTaskID = UIBackgroundTaskInvalid;
         }
     }];
@@ -971,13 +984,18 @@ - (void)makeEventUploadPostRequest:(NSString*) url events:(NSString*) events max
 
 - (void)enterForeground
 {
+    UIApplication *app = [self getSharedApplication];
+    if (!app) {
+      return;
+    }
+
     [self updateLocation];
 
     NSNumber* now = [NSNumber numberWithLongLong:[[self currentTime] timeIntervalSince1970] * 1000];
 
     // Stop uploading
     if (_uploadTaskID != UIBackgroundTaskInvalid) {
-        [[UIApplication sharedApplication] endBackgroundTask:_uploadTaskID];
+        [app endBackgroundTask:_uploadTaskID];
         _uploadTaskID = UIBackgroundTaskInvalid;
     }
     [self runOnBackgroundQueue:^{
@@ -989,16 +1007,22 @@ - (void)enterForeground
 
 - (void)enterBackground
 {
+    UIApplication *app = [self getSharedApplication];
+    if (!app) {
+      return;
+    }
+
     NSNumber* now = [NSNumber numberWithLongLong:[[self currentTime] timeIntervalSince1970] * 1000];
 
     // Stop uploading
     if (_uploadTaskID != UIBackgroundTaskInvalid) {
-        [[UIApplication sharedApplication] endBackgroundTask:_uploadTaskID];
+        [app endBackgroundTask:_uploadTaskID];
     }
-    _uploadTaskID = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
+
+    _uploadTaskID = [app beginBackgroundTaskWithExpirationHandler:^{
         //Took too long, manually stop
         if (_uploadTaskID != UIBackgroundTaskInvalid) {
-            [[UIApplication sharedApplication] endBackgroundTask:_uploadTaskID];
+            [app endBackgroundTask:_uploadTaskID];
             _uploadTaskID = UIBackgroundTaskInvalid;
         }
     }];