Made Process::isForegroundProcess() return a correct result on iOS.

modules/juce_audio_plugin_client/VST3/juce_VST3_Wrapper.cpp

@@ -1194,6 +1194,15 @@ public:
         const int numInputChans  = data.inputs  != nullptr ? (int) data.inputs[0].numChannels : 0;
         const int numOutputChans = data.outputs != nullptr ? (int) data.outputs[0].numChannels : 0;
 
+        if (numInputChans != pluginInstance->getNumInputChannels()
+             || numOutputChans != pluginInstance->getNumOutputChannels())
+        {
+            const double sampleRate = pluginInstance->getSampleRate();
+            const int bufferSize = (int) data.numSamples;
+            pluginInstance->setPlayConfigDetails (numInputChans, numOutputChans, sampleRate, bufferSize);
+            pluginInstance->prepareToPlay (sampleRate, bufferSize);
+        }
+
         int totalChans = 0;
 
         while (totalChans < numInputChans)

modules/juce_core/native/juce_mac_Threads.mm

@@ -31,13 +31,17 @@
     live in juce_posix_SharedCode.h!
 */
 
+#if JUCE_IOS
+bool isIOSAppActive = true;
+#endif
+
 //==============================================================================
 JUCE_API bool JUCE_CALLTYPE Process::isForegroundProcess()
 {
    #if JUCE_MAC
     return [NSApp isActive];
    #else
-    return true; // xxx change this if more than one app is ever possible on iOS!
+    return isIOSAppActive;
    #endif
 }
 

modules/juce_gui_basics/native/juce_ios_Windowing.mm

@@ -22,6 +22,8 @@
   ==============================================================================
 */
 
+extern bool isIOSAppActive;
+
 } // (juce namespace)
 
 @interface JuceAppStartupDelegate : NSObject <UIApplicationDelegate>
@@ -32,6 +34,8 @@
 - (void) applicationWillTerminate: (UIApplication*) application;
 - (void) applicationDidEnterBackground: (UIApplication*) application;
 - (void) applicationWillEnterForeground: (UIApplication*) application;
+- (void) applicationDidBecomeActive: (UIApplication*) application;
+- (void) applicationWillResignActive: (UIApplication*) application;
 
 @end
 
@@ -68,6 +72,18 @@
         app->resumed();
 }
 
+- (void) applicationDidBecomeActive: (UIApplication*) application
+{
+    (void) application;
+    isIOSAppActive = true;
+}
+
+- (void) applicationWillResignActive: (UIApplication*) application
+{
+    (void) application;
+    isIOSAppActive = false;
+}
+
 @end
 
 namespace juce