iOS 屏幕实时共享功能实践（内附详细代码）

/*! Deprecated. Use startRecordingWithHandler: instead.
 @abstract Starts app recording with a completion handler. Note that before recording actually starts, the user may be prompted with UI to confirm recording. @param microphoneEnabled Determines whether the microphone input should be included in the recorded movie audio. @discussion handler Called after user interactions are complete. Will be passed an optional NSError in the RPRecordingErrorDomain domain if there was an issue starting the recording. */[[RPScreenRecorder sharedRecorder] startRecordingWithMicrophoneEnabled:YES handler:^(NSError * _Nullable error) {        if (error) {            //TODO.....        }}];

/*! @abstract Stops app recording with a completion handler. @discussion handler Called when the movie is ready. Will return an instance of RPPreviewViewController on success which should be presented using [UIViewController presentViewController:animated:completion:]. Will be passed an optional NSError in the RPRecordingErrorDomain domain if there was an issue stopping the recording. */[[RPScreenRecorder sharedRecorder] stopRecordingWithHandler:^(RPPreviewViewController *previewViewController, NSError *  error){            [self presentViewController:previewViewController animated:YES completion:^{                //TODO.....            }];}];

/*这俩API可以理解为弹窗触发的事件回调函数；*/- (void)userDidFinishSetup {  //触发  Host App 的RPBroadcastActivityViewControllerDelegate}
- (void)userDidCancelSetup {    //触发  Host App 的RPBroadcastActivityViewControllerDelegate}

- (void)broadcastStartedWithSetupInfo:(NSDictionary<NSString *,NSObject *> *)setupInfo {    // User has requested to start the broadcast. Setup info from the UI extension can be supplied but optional.  //这里主要就是做一些初始化的行为操作}
- (void)broadcastPaused {    // User has requested to pause the broadcast. Samples will stop being delivered.  //接收系统暂停信号}
- (void)broadcastResumed {    // User has requested to resume the broadcast. Samples delivery will resume.  //接收系统恢复信号}
- (void)broadcastFinished {    // User has requested to finish the broadcast.  //接收系统完成信号}
 //这里就是此次更新最炸的点，我们可以拿到系统源数据，而且系统还分了三类，分别为视频帧、App内声音、麦克风- (void)processSampleBuffer:(CMSampleBufferRef)sampleBuffer withType:(RPSampleBufferType)sampleBufferType {       switch (sampleBufferType) {        case RPSampleBufferTypeVideo:            // Handle video sample buffer            break;        case RPSampleBufferTypeAudioApp:            // Handle audio sample buffer for app audio            break;        case RPSampleBufferTypeAudioMic:            // Handle audio sample buffer for mic audio            break;                    default:            break;    }}

RPBroadcastControllerDelegate//startif (![RPScreenRecorder sharedRecorder].isRecording) {      [RPBroadcastActivityViewController loadBroadcastActivityViewControllerWithHandler:^(RPBroadcastActivityViewController * _Nullable broadcastActivityViewController, NSError * _Nullable error) {          if (error) {              NSLog(@"RPBroadcast err %@", [error localizedDescription]);          }          broadcastActivityViewController.delegate = self; /*RPBroadcastActivityViewControllerDelegate*/          [self presentViewController:broadcastActivityViewController animated:YES completion:nil];      }];  }
#pragma mark- RPBroadcastActivityViewControllerDelegate- (void)broadcastActivityViewController:(RPBroadcastActivityViewController *)broadcastActivityViewController didFinishWithBroadcastController:(RPBroadcastController *)broadcastController error:(NSError *)error {  if （error） {    //TODO:    NSLog(@"broadcastActivityViewController:%@",error.localizedDescription);    return;  }     [broadcastController startBroadcastWithHandler:^(NSError * _Nullable error) {        if (!error) {            NSLog(@"success");        } else {            NSLog(@"startBroadcast:%@",error.localizedDescription);        }    }];}
#pragma mark- RPBroadcastControllerDelegate- (void)broadcastController:(RPBroadcastController *)broadcastController didFinishWithError:(nullable NSError *)error{    NSLog(@"didFinishWithError: %@", error);}- (void)broadcastController:(RPBroadcastController *)broadcastController didUpdateServiceInfo:(NSDictionary <NSString *, NSObject <NSCoding> *> *)serviceInf {    NSLog(@"didUpdateServiceInfo: %@", serviceInf);}

[[RPScreenRecorder sharedRecorder] startCaptureWithHandler:^(CMSampleBufferRef  _Nonnull sampleBuffer, RPSampleBufferType bufferType, NSError * _Nullable error) {    [self.videoOutputStream write:sampleBuffer error:nil];} completionHandler:^(NSError * _Nullable error) {    NSLog(@"startCaptureWithHandler:%@",error.localizedDescription);}];

[[RPScreenRecorder sharedRecorder] stopCaptureWithHandler:^(NSError * _Nullable error) {        [self.assetWriter finishWritingWithCompletionHandler:^{            //TODO        }];}];

if (@available(iOS 12.0, *)) {        self.systemBroadcastPickerView = [[RPSystemBroadcastPickerView alloc] initWithFrame:CGRectMake(0, 0, 50, 80)];        self.systemBroadcastPickerView.preferredExtension = ScreenShareBuildID;        self.systemBroadcastPickerView.showsMicrophoneButton = NO;        self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:self.systemBroadcastPickerView];} else {    // Fallback on earlier versions}

#import "SampleHandler.h"#import <RongRTCReplayKitExt/RongRTCReplayKitExt.h>
static NSString *const ScreenShareGroupID = @"group.cn.rongcloud.rtcquickdemo.screenshare";
@interface SampleHandler ()<RongRTCReplayKitExtDelegate>@end
@implementation SampleHandler
- (void)broadcastStartedWithSetupInfo:(NSDictionary<NSString *, NSObject *> *)setupInfo {    // User has requested to start the broadcast. Setup info from the UI extension can be supplied but optional.    [[RCRTCReplayKitEngine sharedInstance] setupWithAppGroup:ScreenShareGroupID delegate:self];}
- (void)broadcastPaused {    // User has requested to pause the broadcast. Samples will stop being delivered.}
- (void)broadcastResumed {    // User has requested to resume the broadcast. Samples delivery will resume.}
- (void)broadcastFinished {    [[RCRTCReplayKitEngine sharedInstance] broadcastFinished];}
- (void)processSampleBuffer:(CMSampleBufferRef)sampleBuffer withType:(RPSampleBufferType)sampleBufferType  API_AVAILABLE(ios(10.0)) {    switch (sampleBufferType) {        case RPSampleBufferTypeVideo:            [[RCRTCReplayKitEngine sharedInstance] sendSampleBuffer:sampleBuffer withType:RPSampleBufferTypeVideo];            break;        case RPSampleBufferTypeAudioApp:            // Handle audio sample buffer for app audio            break;        case RPSampleBufferTypeAudioMic:            // Handle audio sample buffer for mic audio            break;
        default:            break;    }}
#pragma mark - RongRTCReplayKitExtDelegate-(void)broadcastFinished:(RCRTCReplayKitEngine *)broadcast reason:(RongRTCReplayKitExtReason)reason {    NSString *tip = @"";    switch (reason) {        case RongRTCReplayKitExtReasonRequestedByMain:            tip = @"屏幕共享已结束......";            break;        case RongRTCReplayKitExtReasonDisconnected:            tip = @"应用断开.....";            break;        case RongRTCReplayKitExtReasonVersionMismatch:            tip = @"集成错误（SDK 版本号不相符合）........";            break;    }
    NSError *error = [NSError errorWithDomain:NSStringFromClass(self.class)                                         code:0                                     userInfo:@{                                         NSLocalizedFailureReasonErrorKey:tip                                     }];    [self finishBroadcastWithError:error];}

- (void)joinRoom {    RCRTCVideoStreamConfig *videoConfig = [[RCRTCVideoStreamConfig alloc] init];    videoConfig.videoSizePreset = RCRTCVideoSizePreset720x480;    videoConfig.videoFps = RCRTCVideoFPS30;    [[RCRTCEngine sharedInstance].defaultVideoStream setVideoConfig:videoConfig];
    RCRTCRoomConfig *config = [[RCRTCRoomConfig alloc] init];    config.roomType = RCRTCRoomTypeNormal;
    [self.engine enableSpeaker:YES];
    __weak typeof(self) weakSelf = self;    [self.engine joinRoom:self.roomId                   config:config               completion:^(RCRTCRoom *_Nullable room, RCRTCCode code) {                   __strong typeof(weakSelf) strongSelf = weakSelf;                   if (code == RCRTCCodeSuccess) {                       self.room = room;                       room.delegate = self;                       [self publishScreenStream];                   } else {                       [UIAlertController alertWithString:@"加入房间失败" inCurrentViewController:strongSelf];                   }               }];}
- (void)publishScreenStream {    self.videoOutputStream = [[RCRTCScreenShareOutputStream alloc] initWithAppGroup:ScreenShareGroupID];
    RCRTCVideoStreamConfig *videoConfig = self.videoOutputStream.videoConfig;    videoConfig.videoSizePreset = RCRTCVideoSizePreset1280x720;    videoConfig.videoFps = RCRTCVideoFPS24;    [self.videoOutputStream setVideoConfig:videoConfig];        [self.room.localUser publishStream:self.videoOutputStream                            completion:^(BOOL isSuccess, RCRTCCode desc) {                                if (isSuccess) {                                    NSLog(@"发布自定义流成功");                                } else {                                    NSLog(@"发布自定义流失败%@", [NSString stringWithFormat:@"订阅远端流失败:%ld", (long) desc]);                                }                            }];}