Adds periodic resource printing to stdout.

RxExample/RxExample.xcodeproj/xcshareddata/xcschemes/RxExample-iOS.xcscheme

@@ -81,6 +81,13 @@
             ReferencedContainer = "container:RxExample.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
+      <EnvironmentVariables>
+         <EnvironmentVariable
+            key = "OS_ACTIVITY_MODE"
+            value = "disable"
+            isEnabled = "YES">
+         </EnvironmentVariable>
+      </EnvironmentVariables>
       <AdditionalOptions>
          <AdditionalOption
             key = "NSZombieEnabled"

RxExample/RxExample/iOS/AppDelegate.swift

@@ -7,6 +7,7 @@
 //
 
 import UIKit
+import RxSwift
 
 @UIApplicationMain
 class AppDelegate: UIResponder, UIApplicationDelegate {
@@ -17,6 +18,13 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
         if UIApplication.isInUITest {
             UIView.setAnimationsEnabled(false)
         }
+
+        #if DEBUG
+        _ = Observable<Int>.interval(1, scheduler: MainScheduler.instance)
+            .subscribe(onNext: { _ in
+                print("Resource count \(RxSwift.Resources.total)")
+            })
+        #endif
     }
 }