实现视频直播

// ViewController.m
// 导入 UIKit
#import <UIKit/UIKit.h>
@interface ViewController ()
// 定义 localView 变量
@property (nonatomic, strong) UIView *localView;
// 定义 remoteView 变量
@property (nonatomic, strong) UIView *remoteView;
@end
@implementation ViewController
...
- (void)viewDidLoad {
    [super viewDidLoad];
    // 调用初始化视频窗口函数
    [self initViews];
    // 后续步骤调用声网 API 使用的函数
    [self initializeAgoraEngine];
    [self setChannelProfile];
    [self setClientRole];
    [self setupLocalVideo];
    [self joinChannel];
}
// 设置视频窗口布局
- (void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];
    self.remoteView.frame = self.view.bounds;
    self.localView.frame = CGRectMake(self.view.bounds.size.width - 90, 0, 90, 160);
}
- (void)initViews {
    // 初始化远端视频窗口。只有当远端用户为主播时，才会显示视频画面
    self.remoteView = [[UIView alloc] init];
    [self.view addSubview:self.remoteView];
    // 初始化本地视频窗口。只有当本地用户为主播时，才会显示视频画面
    self.localView = [[UIView alloc] init];
    [self.view addSubview:self.localView];
}

// ViewController.swift
// 导入 UIKit
import UIKit
class ViewController: UIViewController {
    ...
    // 定义 localView 变量
    var localView: UIView!
    // 定义 remoteView 变量
    var remoteView: UIView!
     override func viewDidLoad() {
        super.viewDidLoad()
        // 调用初始化视频窗口函数
        initView()
       // 后续步骤调用声网 API 使用的函数
        initializeAgoraEngine()
        setChannelProfile()
        setClientRole()
        setupLocalVideo()
        joinChannel()  
    }
    // 设置视频窗口布局
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        remoteView.frame = self.view.bounds
        localView.frame = CGRect(x: self.view.bounds.width - 90, y: 0, width: 90, height: 160)
    }
    func initView() {
        // 初始化远端视频窗口。只有当远端用户为主播时，才会显示视频画面
        remoteView = UIView()
        self.view.addSubview(remoteView)
        // 初始化本地视频窗口。只有当本地用户为主播时，才会显示视频画面
        localView = UIView()
        self.view.addSubview(localView)
    }
}

// ViewController.h
// 导入 AgoraRtcKit 类
// 自 3.0.0 版本起，AgoraRtcEngineKit 类名更换为 AgoraRtcKit
// 如果获取的是 3.0.0 以下版本的 SDK，请改用 #import <AgoraRtcEngineKit/AgoraRtcEngineKit.h>
#import <AgoraRtcKit/AgoraRtcEngineKit.h>
// 声明 AgoraRtcEngineDelegate，用于监听回调
@interface ViewController : UIViewController <AgoraRtcEngineDelegate>
// 定义 agoraKit 变量
@property (strong, nonatomic) AgoraRtcEngineKit *agoraKit;

// ViewController.swift
// 导入 AgoraRtcKit 类
// 自 3.0.0 版本起，AgoraRtcEngineKit 类名更换为 AgoraRtcKit
// 如果获取的是 3.0.0 以下版本的 SDK，请改用 import AgoraRtcEngineKit
import AgoraRtcKit
class ViewController: UIViewController {
    ...
    // 定义 agoraKit 变量
    var agoraKit: AgoraRtcEngineKit?
}

// ViewController.m
- (void)initializeAgoraEngine {
    self.agoraKit = [AgoraRtcEngineKit sharedEngineWithAppId:@"YourAppID" delegate:self];
}

// ViewController.swift
func initializeAgoraEngine() {
       agoraKit = AgoraRtcEngineKit.sharedEngine(withAppId: "YourAPPID", delegate: self)
    }

// ViewController.m
- (void)setChannelProfile {
[self.agoraKit setChannelProfile:AgoraChannelProfileLiveBroadcasting];
}

// ViewController.swift
func setChannelProfile(){
agoraKit?.setChannelProfile(.liveBroadcasting)
}

// ViewController.m
- (void)setClientRole {
// 设置用户角色为主播
[self.agoraKit setClientRole:AgoraClientRoleBroadcaster];
// 设置用户角色为观众
AgoraClientRoleOptions *options = [AgoraClientRoleOptions alloc];
options.audienceLatencyLevel = AgoraAudienceLatencyLevelLowLatency;
[self.rtcEngineKit setClientRole:AgoraClientRoleAudience options:options];
}

// ViewController.swift
func setClientRole(){
// 设置用户角色为主播
agoraKit?.setClientRole(.broadcaster)
// 设置用户角色为观众
let options: AgoraClientRoleOptions = AgoraClientRoleOptions()
options.audienceLatencyLevel = AgoraAudienceLatencyLevelType.lowLatency
agoraKit.setClientRole(.audience, options: options)
}

// ViewController.m
- (void)setupLocalVideo {
// 启用视频模块
[self.agoraKit enableVideo];
AgoraRtcVideoCanvas *videoCanvas = [[AgoraRtcVideoCanvas alloc] init];
videoCanvas.uid = 0;
videoCanvas.renderMode = AgoraVideoRenderModeHidden;
videoCanvas.view = self.localView;
// 设置本地视图
[self.agoraKit setupLocalVideo:videoCanvas];
}

// ViewController.swift
func setupLocalVideo() {
    // 启用视频模块
    agoraKit?.enableVideo()
    let videoCanvas = AgoraRtcVideoCanvas()
    videoCanvas.uid = 0
    videoCanvas.renderMode = .hidden
    videoCanvas.view = localView
    // 设置本地视图
    agoraKit?.setupLocalVideo(videoCanvas)
    }

// ViewController.m
- (void)joinChannel {
    // 频道内每个用户的 uid 必须是唯一的
    [self.agoraKit joinChannelByToken:@"YourToken" channelId:@"YourChannelName" info:nil uid:0 joinSuccess:^(NSString * _Nonnull channel, NSUInteger uid, NSInteger elapsed) {
}];
}

// ViewController.swift
func joinChannel(){
        // 频道内每个用户的 uid 必须是唯一的
        agoraKit?.joinChannel(byToken: "YourToken", channelId: "YourChannelName", info: nil, uid: 0, joinSuccess: { (channel, uid, elapsed) in
    })
}

// ViewController.m
// 监听 didJoinedOfUid 回调
// 远端主播加入频道时，会触发该回调
- (void)rtcEngine:(AgoraRtcEngineKit *)engine didJoinedOfUid:(NSUInteger)uid elapsed:(NSInteger)elapsed {
    AgoraRtcVideoCanvas *videoCanvas = [[AgoraRtcVideoCanvas alloc] init];
    videoCanvas.uid = uid;
    videoCanvas.renderMode = AgoraVideoRenderModeHidden;
    videoCanvas.view = self.remoteView;
    // 设置远端视图
    [self.agoraKit setupRemoteVideo:videoCanvas];
}

// ViewController.swift，需要在 class ViewController: UIViewController 函数之外添加以下代码
extension ViewController: AgoraRtcEngineDelegate {
    // 监听 didJoinedOfUid 回调
    // 远端主播加入频道时，会触发该回调
    func rtcEngine(_ engine: AgoraRtcEngineKit, didJoinedOfUid uid: UInt, elapsed: Int) {
        let videoCanvas = AgoraRtcVideoCanvas()
        videoCanvas.uid = uid
        videoCanvas.renderMode = .hidden
        videoCanvas.view = remoteView
        // 设置远端视图
        agoraKit?.setupRemoteVideo(videoCanvas)
    }
}

// ViewController.m
- (void)leaveChannel {
    [self.agoraKit leaveChannel:nil];
}

// ViewController.swift
func leaveChannel() {
        agoraKit?.leaveChannel(nil)
    }

// ViewController.m
// 将以下代码填入你定义的函数中
[AgoraRtcEngineKit destroy];

// ViewController.swift
// 将以下代码填入你定义的函数中
AgoraRtcEngineKit.destroy()