Added support for iOS custom delegates - use at your own risk

modules/juce_events/messages/juce_ApplicationBase.cpp

@@ -164,7 +164,7 @@ StringArray JUCE_CALLTYPE JUCEApplicationBase::getCommandLineParameterArray()
 #else
 
 #if JUCE_IOS
- extern int juce_iOSMain (int argc, const char* argv[]);
+ extern int juce_iOSMain (int argc, const char* argv[], void* classPtr);
 #endif
 
 #if JUCE_MAC
@@ -201,7 +201,7 @@ StringArray JUCEApplicationBase::getCommandLineParameterArray()
     return StringArray (juce_argv + 1, juce_argc - 1);
 }
 
-int JUCEApplicationBase::main (int argc, const char* argv[])
+int JUCEApplicationBase::main (int argc, const char* argv[], void* customDelegate)
 {
     JUCE_AUTORELEASEPOOL
     {
@@ -213,8 +213,10 @@ int JUCEApplicationBase::main (int argc, const char* argv[])
        #endif
 
        #if JUCE_IOS
-        return juce_iOSMain (argc, argv);
+        return juce_iOSMain (argc, argv, customDelegate);
        #else
+        ignoreUnused (customDelegate);
+
         return JUCEApplicationBase::main();
        #endif
     }

modules/juce_events/messages/juce_ApplicationBase.h

@@ -252,7 +252,7 @@ public:
    #ifndef DOXYGEN
     // The following methods are for internal use only...
     static int main();
-    static int main (int argc, const char* argv[]);
+    static int main (int argc, const char* argv[], void*);
 
     static void appWillTerminateByForce();
     typedef JUCEApplicationBase* (*CreateInstanceFunction)();

modules/juce_events/messages/juce_Initialisation.h

@@ -97,7 +97,7 @@ public:
   #define JUCE_MAIN_FUNCTION_ARGS
  #else
   #define JUCE_MAIN_FUNCTION       int main (int argc, char* argv[])
-  #define JUCE_MAIN_FUNCTION_ARGS  argc, (const char**) argv
+  #define JUCE_MAIN_FUNCTION_ARGS  argc, (const char**) argv, nullptr
  #endif
 
  #define START_JUCE_APPLICATION(AppClass) \
@@ -107,6 +107,56 @@ public:
         juce::JUCEApplicationBase::createInstance = &juce_CreateApplication; \
         return juce::JUCEApplicationBase::main (JUCE_MAIN_FUNCTION_ARGS); \
     }
+
+ #if JUCE_IOS
+  /**
+      You can instruct JUCE to use a custom iOS app delegate class instaed of JUCE's default
+      app delegate. For JUCE to work you must pass all messages to JUCE's internal app delegate.
+      Below is an example of minimal forwarding custom delegate. Note that you are at your own
+      risk if you decide to use your own delegate an subtle, hard to debug bugs may occur.
+
+      @interface MyCustomDelegate : NSObject <UIApplicationDelegate> { NSObject<UIApplicationDelegate>* juceDelegate; } @end
+      @implementation MyCustomDelegate
+      -(id) init
+      {
+          self = [super init];
+          juceDelegate = reinterpret_cast<NSObject<UIApplicationDelegate>*> ([[NSClassFromString (@"JuceAppStartupDelegate") alloc] init]);
+
+          return self;
+      }
+
+      -(void)dealloc
+      {
+          [juceDelegate release];
+          [super dealloc];
+      }
+
+      - (void)forwardInvocation:(NSInvocation *)anInvocation
+      {
+         if (juceDelegate != nullptr && [juceDelegate respondsToSelector:[anInvocation selector]])
+             [anInvocation invokeWithTarget:juceDelegate];
+        else
+             [super forwardInvocation:anInvocation];
+      }
+
+      -(BOOL)respondsToSelector:(SEL)aSelector
+      {
+          if (juceDelegate != nullptr && [juceDelegate respondsToSelector:aSelector])
+             return YES;
+
+          return [super respondsToSelector:aSelector];
+      }
+      @end
+  */
+  #define START_JUCE_APPLICATION_WITH_CUSTOM_DELEGATE(AppClass, DelegateClass) \
+     static juce::JUCEApplicationBase* juce_CreateApplication() { return new AppClass(); } \
+     extern "C" JUCE_MAIN_FUNCTION \
+     { \
+         juce::JUCEApplicationBase::createInstance = &juce_CreateApplication; \
+         return juce::JUCEApplicationBase::main (argc, (const char**) argv, [DelegateClass class]); \
+     }
+ #endif
+
 #endif
 
 #endif   // JUCE_INITIALISATION_H_INCLUDED

modules/juce_gui_basics/native/juce_ios_Windowing.mm

@@ -109,10 +109,12 @@ Array<AppInactivityCallback*> appBecomingInactiveCallbacks;
 namespace juce
 {
 
-int juce_iOSMain (int argc, const char* argv[]);
-int juce_iOSMain (int argc, const char* argv[])
+int juce_iOSMain (int argc, const char* argv[], void* customDelgatePtr);
+int juce_iOSMain (int argc, const char* argv[], void* customDelagetPtr)
 {
-    return UIApplicationMain (argc, const_cast<char**> (argv), nil, @"JuceAppStartupDelegate");
+    Class delegateClass = (customDelagetPtr != nullptr ? reinterpret_cast<Class> (customDelagetPtr) : [JuceAppStartupDelegate class]);
+
+    return UIApplicationMain (argc, const_cast<char**> (argv), nil, NSStringFromClass (delegateClass));
 }
 
 //==============================================================================