[UIApplication applicationState] called not from main thread

[pierzyns]

Bug Report

XCode MainThread checker found an issue during connection into HU. The Issue is in function - (void)sendMobileHMIState in SDLProxy.m file. In this function there is called [UIApplication sharedApplication].applicationState; on the _receiveQueue workingQueue instead of Main Thread.

Reproduction Steps

1. Enable the MainThread checker in Xcode
2. Run the Application in debug mode
3. Connect the the HU and try to use the app

Expected Behavior

[UIApplication sharedApplication].applicationState; must be used from main thread only.

Observed Behavior

[UIApplication sharedApplication].applicationState; is used from other thread.

OS & Version Information

• iOS Version: 11.1.1
• SDL iOS Version: 5.1.0
• Testing Against: [What you tested with to observe this behavior]

Test Case, Sample Code, and / or Example App

#pragma mark - Application Lifecycle

- (void)sendMobileHMIState {
    UIApplicationState appState = [UIApplication sharedApplication].applicationState;
    SDLOnHMIStatus *HMIStatusRPC = [[SDLOnHMIStatus alloc] init];

    HMIStatusRPC.audioStreamingState = SDLAudioStreamingStateNotAudible;
    HMIStatusRPC.systemContext = SDLSystemContextMain;

    switch (appState) {
        case UIApplicationStateActive: {
            HMIStatusRPC.hmiLevel = SDLHMILevelFull;
        } break;
        case UIApplicationStateBackground: // Fallthrough
        case UIApplicationStateInactive: {
            HMIStatusRPC.hmiLevel = SDLHMILevelBackground;
        } break;
        default:
            break;
    }

    SDLLogD(@"Mobile UIApplication state changed, sending to remote system: %@", HMIStatusRPC.hmiLevel);
    [self sendRPC:HMIStatusRPC];
}