sudo gem install cocoapods

pod init

platform :ios, '8.0'
target 'App' do

# RTC Engine Lite Edition (Recommended)
# Minimum incremental size of the installation package. Only the RTC Engine and TXLivePlayer features are supported.
pod 'TXLiteAVSDK_TRTC', :podspec => 'https://liteav.sdk.qcloud.com/pod/liteavsdkspec/TXLiteAVSDK_TRTC.podspec'

# LiteAVSDK Professional Edition
# A number of features, such as RTC Engine, TXLivePlayer, TXLivePusher, TXVodPlayer, and UGSV, are supported.
pod 'TXLiteAVSDK_Professional', :podspec => 'https://liteav.sdk.qcloud.com/pod/liteavsdkspec/TXLiteAVSDK_Professional.podspec'

end

pod install

pod update

Privacy - Microphone Usage Description. Enter a prompt specifying the purpose of microphone use.
Privacy - Camera Usage Description. Enter a prompt specifying the purpose of camera use.

- (void)enterRoomByAudienceWithUserId:(NSString *)userId roomId:(NSString *)roomId {
    TRTCParams *params = [[TRTCParams alloc] init];
    // Take a string room ID as an example.
    params.strRoomId = roomId;
    params.userId = userId;
    // UserSig obtained from the business backend.
    params.userSig = @"userSig";
    // Replace with your SDKAppID.
    params.sdkAppId = 0;
    // Specify the audience role.
    params.role = TRTCRoleAudience;
    // Enter the room in an interactive live streaming scenario.
    [self.trtcCloud enterRoom:params appScene:TRTCAppSceneVideoCall];
}

// Event callback for the result of entering the room.
- (void)onEnterRoom:(NSInteger)result {
    if (result > 0) {
        // The result indicates the time taken (in milliseconds) to join the room.
        NSLog(@"Enter room succeed!");
    } else {
        // The result indicates the error code for a room entry failure.
        NSLog(@"Enter room failed!");
    }
}

- (void)onUserAudioAvailable:(NSString *)userId available:(BOOL)available {
    // The remote user publishes/unpublishes the audio.
    // In the automatic subscription mode, you do not need to do anything. The SDK will automatically play the audio of the remote user.
}

- (void)onUserVideoAvailable:(NSString *)userId available:(BOOL)available {
    // The remote user publishes/unpublishes the primary video.
    if (available) {
        // Subscribe to the video stream of the remote user and bind the video rendering control.
        [self.trtcCloud startRemoteView:userId streamType:TRTCVideoStreamTypeBig view:self.remoteView];
    } else {
        // Unsubscribe to the video stream of the remote user and release the rendering control.
        [self.trtcCloud stopRemoteView:userId streamType:TRTCVideoStreamTypeBig];
    }
}

- (void)setupRemoteRenderParams {
    TRTCRenderParams *params = [[TRTCRenderParams alloc] init];
    // Video mirror mode.
    params.mirrorType = TRTCVideoMirrorTypeAuto;
    // Video fill mode.
    params.fillMode = TRTCVideoFillMode_Fill;
    // Video rotation angle.
    params.rotation = TRTCVideoRotation_0;
    // Set the rendering mode for the remote video.
    [self.trtcCloud setRemoteRenderParams:@"userId" streamType:TRTCVideoStreamTypeBig params:params];
}

- (void)exitRoom {
    [self.trtcCloud stopLocalAudio];
    [self.trtcCloud stopLocalPreview];
    [self.trtcCloud exitRoom];
}

// Event callback for exiting the room.
- (void)onExitRoom:(NSInteger)reason {
    if (reason == 0) {
        NSLog(@"Actively call exitRoom to exit the room.");
    } else if (reason == 1) {
        NSLog(@"Removed from the current room by the server.");
    } else if (reason == 2) {
        NSLog(@"The current room has been dissolved.");
    }
}