sudo gem install cocoapods

pod init

platform :ios, '8.0'

# Modify the 'App' to the name of your project
target 'App' do
pod 'TXLiteAVSDK_TRTC', :podspec => 'https://liteav.sdk.qcloud.com/pod/liteavsdkspec/TXLiteAVSDK_TRTC.podspec'
end

pod install

@import TXLiteAVSDK_TRTC; // Import TRTC SDK Module

@interface AppDelegate : UIResponder <UIApplicationDelegate, TRTCCloudDelegate> // Declare the TRTCCloudDelegate interface

@property (nonatomic, strong) TRTCCloud *trtcCloud; // Declare the TRTCCloud property

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Create a TRTC instance and set up a listener
    _trtcCloud = [TRTCCloud sharedInstance];
    _trtcCloud.delegate = self;
    
    return YES;
}

// Listen for the 'onError' event
- (void)onError:(TXLiteAVError)errCode
         errMsg:(nullable NSString *)errMsg
        extInfo:(nullable NSDictionary *)extInfo{
    // Handle the 'onError' event
    // Recommend to display OnError information via 'toastTip:'
    NSString *errCodeStr = [NSString stringWithFormat:@"%ld", (long)errCode];
    NSString *extInfoStr = extInfo ? [extInfo description] : @"";
    NSString *notification = [NSString stringWithFormat:@"%@, %@, %@", errCodeStr, errMsg, extInfoStr];
    [self toastTip:notification];
}

// Implement 'toastTip:'
- (void)toastTip:(NSString *)tip {
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Tip"
                                                                   message:tip
                                                            preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"Confirm"
                                                       style:UIAlertActionStyleDefault
                                                     handler:nil];
    [alert addAction:okAction];
    [self.window.rootViewController presentViewController:alert animated:YES completion:nil];
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [alert dismissViewControllerAnimated:YES completion:nil];
    });
}

@property (strong, nonatomic) UIWindow *window; // Declare the UIWindow property
@property (nonatomic, strong) UIView *localCameraVideoView; // Declare the UIView property

- (void)startLocalPreview {
    // Set the local preview rendering parameter
    TRTCRenderParams *trtcRenderParams = [[TRTCRenderParams alloc] init];
    trtcRenderParams.fillMode   = TRTCVideoFillMode_Fill;
    trtcRenderParams.mirrorType = TRTCVideoMirrorTypeAuto;
    
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    [appDelegate.trtcCloud setLocalRenderParams:trtcRenderParams];

    // Preview the collected content locally
    [appDelegate.trtcCloud startLocalPreview:YES view:self.localCameraVideoView];
}

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
[appDelegate.trtcCloud stopLocalPreview];

// By default, the front camera is enabled and switch to the rear camera
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
TXDeviceManager * deviceManager = [appDelegate.trtcCloud getDeviceManager];
if([deviceManager isFrontCamera]) {
    [deviceManager switchCamera:false];
}

// Switch to the front camera
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
TXDeviceManager * deviceManager = [appDelegate.trtcCloud getDeviceManager];
[deviceManager switchCamera:true];

// If the automatic face recognition supported, enable the auto focus function
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
TXDeviceManager * deviceManager = [appDelegate.trtcCloud getDeviceManager];
if([deviceManager isAutoFocusEnabled]) {
    [deviceManager enableCameraAutoFocus:true];
}

// Disable the autofocus function
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
TXDeviceManager * deviceManager = [appDelegate.trtcCloud getDeviceManager];
[deviceManager enableCameraAutoFocus:false];

// The flash can be turned on when using the rear camera
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
TXDeviceManager * deviceManager = [appDelegate.trtcCloud getDeviceManager];
if(![deviceManager isFrontCamera]) {
    [deviceManager enableCameraTorch:true];
}

// Turn off the flash
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
TXDeviceManager * deviceManager = [appDelegate.trtcCloud getDeviceManager];
[deviceManager enableCameraTorch:false];

#import "AppDelegate.h" // Import the "AppDelegate.h" file

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    // Initialize localCameraVideoView
    self.localCameraVideoView = [[UIView alloc] initWithFrame:self.view.bounds];
    self.localCameraVideoView.backgroundColor = [UIColor blackColor];
    
    [self viewDidAppear];
}

- (void)viewDidAppear {
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    
    // Add the localCameraVideoView to the view hierarchy of the current view
    [self.view addSubview:self.localCameraVideoView];

    // Start local preview
    [appDelegate.trtcCloud startLocalPreview:YES view:self.localCameraVideoView];
}
@end

- (void)startRemoteView {
    // Play the remote side's video
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    [appDelegate.trtcCloud startRemoteView:@"denny" streamType:TRTCVideoStreamTypeBig view:self.localCameraVideoView];
}

// Stop the video
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
[appDelegate.trtcCloud stopRemoteView:@"denny"]; // Only stop denny's video
[appDelegate.trtcCloud stopAllRemoteView]; // Stop all videos