Issue #106: MIKMIDIConnectionManager (optionally) saves its configura…

…tion on application backgrounding/termination.

Source/MIKMIDIConnectionManager.m

@@ -13,6 +13,12 @@
 #import "MIKMIDINoteOnCommand.h"
 #import "MIKMIDINoteOffCommand.h"
 
+#if TARGET_OS_IPHONE
+#import <UIKit/UIApplication.h>
+#else
+#import <AppKit/NSApplication.h>
+#endif
+
 void *MIKMIDIConnectionManagerKVOContext = &MIKMIDIConnectionManagerKVOContext;
 
 NSString * const MIKMIDIConnectionManagerConnectedDevicesKey = @"MIKMIDIConnectionManagerConnectedDevicesKey";
@@ -68,6 +74,13 @@ - (instancetype)initWithName:(NSString *)name delegate:(id<MIKMIDIConnectionMana
 		[nc addObserver:self selector:@selector(endpointWasPluggedIn:) name:MIKMIDIVirtualEndpointWasAddedNotification object:nil];
 		[nc addObserver:self selector:@selector(endpointWasUnplugged:) name:MIKMIDIVirtualEndpointWasRemovedNotification object:nil];
 
+#if TARGET_OS_IPHONE
+		[nc addObserver:self selector:@selector(saveConfigurationOnApplicationLifecycleEvent:) name:UIApplicationDidEnterBackgroundNotification object:nil];
+		[nc addObserver:self selector:@selector(saveConfigurationOnApplicationLifecycleEvent:) name:UIApplicationWillTerminateNotification object:nil];
+#else
+		[nc addObserver:self selector:@selector(saveConfigurationOnApplicationLifecycleEvent:) name:NSApplicationWillTerminateNotification object:nil];
+#endif
+
 		[self updateAvailableDevices];
 		[self scanAndConnectToInitialAvailableDevices];
 	}
@@ -462,6 +475,13 @@ - (void)endpointWasUnplugged:(NSNotification *)notification
 	if (unpluggedDevice) [self internalDisconnectFromDevice:unpluggedDevice];
 }
 
+- (void)saveConfigurationOnApplicationLifecycleEvent:(NSNotification *)notification
+{
+	if (self.automaticallySavesConfiguration) {
+		[self saveConfiguration];
+	}
+}
+
 #pragma mark - KVO
 
 - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context