iOS: Fixed UI issues with main thread and added alert for permission.

src/ios/CDVCapture.bundle/de.lproj/Localizable.strings

@@ -26,3 +26,7 @@
 "timed recording complete" = "programmierte Aufnahme beendet";
 // accessibility hint for display of recorded elapsed time
 "recorded time in minutes and seconds" = "aufgenommene Zeit in Minuten und Sekunden";
+// Access denied
+"Access denied" = "Zugriff abgelehnt";
+// Microphone access has been prohibited
+"Access to the microphone has been prohibited. Please enable it in the Settings app to continue." = "Der Zugriff auf das Mikrofon wurde verboten. Bitte aktivieren Sie es in der Einstellungen-App, um fortzufahren.";

src/ios/CDVCapture.bundle/en.lproj/Localizable.strings

@@ -25,3 +25,7 @@
 "timed recording complete" = "timed recording complete";
 // accessibility hint for display of recorded elapsed time
 "recorded time in minutes and seconds" = "recorded time in minutes and seconds";
+// Access denied
+"Access denied" = "Access denied";
+// Microphone access has been prohibited
+"Access to the microphone has been prohibited. Please enable it in the Settings app to continue." = "Access to the microphone has been prohibited. Please enable it in the Settings app to continue.";

src/ios/CDVCapture.bundle/es.lproj/Localizable.strings

@@ -25,3 +25,7 @@
 "timed recording complete" = "tiempo de grabación completo";
 // accessibility hint for display of recorded elapsed time
 "recorded time in minutes and seconds" = "tiempo registrado en minutos y segundos";
+// Access denied
+"Access denied" = "Acceso denegado";
+// Microphone access has been prohibited
+"Access to the microphone has been prohibited. Please enable it in the Settings app to continue." = "Se ha prohibido el acceso al micrófono. Habilítelo en la aplicación Configuración para continuar.";

src/ios/CDVCapture.bundle/se.lproj/Localizable.strings

@@ -26,3 +26,7 @@
 "timed recording complete" = "inspelning har avslutad";
 // accessibility hint for display of recorded elapsed time
 "recorded time in minutes and seconds" = "inspelad tid in minuter och sekund";
+// Access denied
+"Access denied" = "Tillträde beviljas ej";
+// Microphone access has been prohibited
+"Access to the microphone has been prohibited. Please enable it in the Settings app to continue." = "Tillgång till mikrofonen har förbjudits. Aktivera det i appen Inställningar för att fortsätta.";

src/ios/CDVCapture.m

@@ -811,9 +811,6 @@ - (void)processButton:(id)sender
         // view cleanup will occur in audioRecordingDidFinishRecording
     } else {
         // begin recording
-        [self.recordButton setImage:stopRecordImage forState:UIControlStateNormal];
-        self.recordButton.accessibilityTraits &= ~[self accessibilityTraits];
-        [self.recordingView setHidden:NO];
         __block NSError* error = nil;
 
         __weak CDVAudioRecorderViewController* weakSelf = self;
@@ -826,9 +823,12 @@ - (void)processButton:(id)sender
                 weakSelf.errorCode = CAPTURE_INTERNAL_ERR;
                 [weakSelf dismissAudioView:nil];
             } else {
+                [weakSelf.recordButton setImage:weakSelf.stopRecordImage forState:UIControlStateNormal];
+                weakSelf.recordButton.accessibilityTraits &= ~[self accessibilityTraits];
+                [weakSelf.recordingView setHidden:NO];
                 if (weakSelf.duration) {
                     weakSelf.isTimed = true;
-                    [weakSelf.avRecorder recordForDuration:[duration doubleValue]];
+                    [weakSelf.avRecorder recordForDuration:[weakSelf.duration doubleValue]];
                 } else {
                     [weakSelf.avRecorder record];
                 }
@@ -845,13 +845,15 @@ - (void)processButton:(id)sender
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Warc-performSelector-leaks"
             [self.avSession performSelector:rrpSel withObject:^(BOOL granted){
-                if (granted) {
-                    startRecording();
-                } else {
-                    NSLog(@"Error creating audio session, microphone permission denied.");
-                    weakSelf.errorCode = CAPTURE_INTERNAL_ERR;
-                    [weakSelf dismissAudioView:nil];
-                }
+                dispatch_async(dispatch_get_main_queue(), ^{
+                    if (granted) {
+                        startRecording();
+                    } else {
+                        NSLog(@"Error creating audio session, microphone permission denied.");
+                        weakSelf.errorCode = CAPTURE_INTERNAL_ERR;
+                        [weakSelf showMicrophonePermissionAlert];
+                    }
+                });
             }];
 #pragma clang diagnostic pop
         } else {
@@ -891,6 +893,24 @@ - (void)stopRecordingCleanup
     }
 }
 
+- (void) showMicrophonePermissionAlert {
+    UIAlertController* controller =
+        [UIAlertController alertControllerWithTitle:PluginLocalizedString(captureCommand, @"Access denied", nil)
+                                            message:PluginLocalizedString(captureCommand, @"Access to the microphone has been prohibited. Please enable it in the Settings app to continue.", nil)
+                                     preferredStyle:UIAlertControllerStyleAlert];
+
+    UIAlertAction* actionOk = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil];
+    [controller addAction:actionOk];
+
+    UIAlertAction* actionSettings = [UIAlertAction actionWithTitle:@"Settings" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
+        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString] options:[NSDictionary dictionary] completionHandler:nil];
+    }];
+    [controller addAction:actionSettings];
+
+    __weak CDVAudioRecorderViewController* weakSelf = self;
+    [weakSelf presentViewController:controller animated:true completion:nil];
+}
+
 - (void)dismissAudioView:(id)sender
 {
     // called when done button pressed or when error condition to do cleanup and remove view