#1216 - Added test usage of pausing / resuming Metrics to simulate app entering background mode and no other location manager running. Added paused state checking to pauseMetricsCollection and resumeMetricsCollection

ios/app/MBXAppDelegate.m

@@ -1,5 +1,6 @@
 #import "MBXAppDelegate.h"
 #import "MBXViewController.h"
+#import <mbgl/ios/MGLMapboxEvents.h>
 
 @implementation MBXAppDelegate
 
@@ -12,4 +13,15 @@
     return YES;
 }
 
+- (void)applicationWillEnterForeground:(UIApplication *)application
+{
+    [MGLMapboxEvents resumeMetricsCollection];
+}
+
+- (void)applicationDidEnterBackground:(UIApplication *)application
+{
+    [MGLMapboxEvents pauseMetricsCollection];
+}
+
+
 @end

platform/ios/MGLMapboxEvents.m

@@ -230,6 +230,9 @@ NSString *const MGLEventGestureRotateStart = @"Rotation";
 //
 + (void) pauseMetricsCollection {
     assert([[NSThread currentThread] isMainThread]);
+    if ([MGLMapboxEvents sharedManager].isPaused) {
+        return;
+    }
     [MGLMapboxEvents sharedManager].isPaused = YES;
     [MGLMetricsLocationManager stopUpdatingLocation];
 }
@@ -238,6 +241,9 @@ NSString *const MGLEventGestureRotateStart = @"Rotation";
 //
 + (void) resumeMetricsCollection {
     assert([[NSThread currentThread] isMainThread]);
+    if (![MGLMapboxEvents sharedManager].isPaused) {
+        return;
+    }
     [MGLMapboxEvents sharedManager].isPaused = NO;
     [MGLMetricsLocationManager startUpdatingLocation];
 }