iOS录屏功能与系统版本关联，每个版本使用的库或者API不尽相同，实现的功能也不太一样，具体如下：
1、iOS 9以前
iOS 9以前系统未开放相关的API，需要使用私有库开发相关功能，目前框兼容于iOS 9+系统版本，且苹果已将该私有库彻底禁用，无法使用，故忽略。
2、iOS 9
iOS9开始，苹果新增了 ReplayKit 框架，使用该框架中的API进行录屏，该功能只能录制应用内屏幕，且无法操作视频/音频流，最终只能在预览页面进行“保存”、“拷贝”、“分享”等操作。具体使用如下：
// 判断是否正在录屏
if ([RPScreenRecorder sharedRecorder].isRecording) {
NSLog(@"正在录制");
return;
}
// 判断录屏功能是否可用
if (![[RPScreenRecorder sharedRecorder] isAvailable]) {
NSLog(@"录屏功能不可用");
}
// 开始录制
[[RPScreenRecorder sharedRecorder] startRecordingWithMicrophoneEnabled:YES handler:^(NSError * _Nullable error) {
if (error) {
NSLog(@"开始录制出错：%@", error);
} else {
NSLog(@"开始录制");
}
}];
[[RPScreenRecorder sharedRecorder] stopRecordingWithHandler:^(RPPreviewViewController * _Nullable previewViewController, NSError * _Nullable error) {
if (error) {
NSLog(@"结束录屏失败: %@", error);
return ;
}
previewViewController.previewControllerDelegate = self;
dispatch_async(dispatch_get_main_queue(), ^{
[self presentViewController:previewViewController animated:YES completion:nil];
});
}];
#pragma mark - RPPreviewViewControllerDelegate
- (void)previewController:(RPPreviewViewController *)previewController didFinishWithActivityTypes:(NSSet *)activityTypes {
if ([activityTypes containsObject:UIActivityTypeSaveToCameraRoll]) {
// 保存到相册
}
[previewController dismissViewControllerAnimated:YES completion:nil];
}
3、iOS 10
从iOS 10开始，苹果新增了录制系统屏幕的API，即应用即使退出前台也能持续录制，以下称为“系统屏幕录制”，区分于“应用屏幕录制”。
- 应用屏幕录制
与iOS 9的API类似，只不过将iOS 9中开始录屏的方法 startRecordingWithMicrophoneEnabled 参数改为使用属性，
[RPScreenRecorder sharedRecorder].microphoneEnabled = YES;
[[RPScreenRecorder sharedRecorder] startRecordingWithHandler:^(NSError *error){
if (error) {
NSLog(@"开始录制error %@", error);
} else {
NSLog(@"开始录制");
}
}];
其他与iOS 9一样
- 系统屏幕录制
该功能同样基于 ReplayKit 实现，只不过具体实现并不是在主应用中，而是在主应用工程的Extension(扩展)中实现，具体为 Broadcast Setup UI Extension 和Broadcast Upload Extension，其中Broadcast Setup UI Extension负责UI绘制，Broadcast Upload Extension负责数据处理。
大体流程如下：
主应用 唤起 已实现 BBroadcast Setup UI Extension 应用的对应扩展，会在主应用中显示该扩展的UI页面，在该页面调用 “userDidFinishSetup” 启动 “Broadcast Upload Extension” 开始进行屏幕录制，并在该扩展中处理视频流、音频流数据。
Broadcast Setup UI Extension :
// Call this method when the user has finished interacting with the view controller and a broadcast stream can start
- (void)userDidFinishSetup {
// URL of the resource where broadcast can be viewed that will be returned to the application
NSURL *broadcastURL = [NSURL URLWithString:@"http://apple.com/broadcast/streamID"];
// Dictionary with setup information that will be provided to broadcast extension when broadcast is started
NSDictionary *setupInfo = @{ @"broadcastName" : @"example" };
// Tell ReplayKit that the extension is finished setting up and can begin broadcasting
[self.extensionContext completeRequestWithBroadcastURL:broadcastURL setupInfo:setupInfo];
}
- (void)userDidCancelSetup {
// Tell ReplayKit that the extension was cancelled by the user
[self.extensionContext cancelRequestWithError:[NSError errorWithDomain:@"YourAppDomain" code:-1 userInfo:@{NSLocalizedDescriptionKey : @"StopBroadcast"}]];
}
Broadcast Upload Extension
- (void)broadcastStartedWithSetupInfo:(NSDictionary *)setupInfo {
// User has requested to start the broadcast. Setup info from the UI extension can be supplied but optional.
// 用户已启动广播。
// 可以提供来自UI扩展的设置信息，但这是可选的
NSLog(@"启动广播");
}
- (void)broadcastPaused {
// User has requested to pause the broadcast. Samples will stop being delivered.
// 用户暂停广播。
NSLog(@"暂停广播");
}
- (void)broadcastResumed {
// User has requested to resume the broadcast. Samples delivery will resume.
// 用户恢复广播
NSLog(@"恢复广播");
}
- (void)broadcastFinished {
// User has requested to finish the broadcast.
// 用户完成广播
NSLog(@"完成广播");
}
- (void)processSampleBuffer:(CMSampleBufferRef)sampleBuffer withType:(RPSampleBufferType)sampleBufferType {
switch (sampleBufferType) {
case RPSampleBufferTypeVideo:
// Handle video sample buffer
// 视频流
// 得到YUV数据
NSLog(@"视频流");
break;
case RPSampleBufferTypeAudioApp:
// Handle audio sample buffer for app audio
// 处理app音频
NSLog(@"App音频流");
break;
case RPSampleBufferTypeAudioMic:
// Handle audio sample buffer for mic audio
// 处理麦克风音频
NSLog(@"麦克风音频流");
break;
default:
break;
}
}
唤起录屏功能（在另外的应用，区分主应用）：
[RPBroadcastActivityViewController loadBroadcastActivityViewControllerWithHandler:^(RPBroadcastActivityViewController * _Nullable broadcastActivityViewController, NSError * _Nullable error) {
if (error) {
NSLog(@"RPBroadcast err %@", [error localizedDescription]);
} else {
dispatch_async(dispatch_get_main_queue(), ^{
broadcastActivityViewController.delegate = self;
broadcastActivityViewController.modalPresentationStyle = UIModalPresentationPopover;
[self presentViewController:broadcastActivityViewController animated:YES completion:nil];
});
}
}];
// 用户选了扩展之后回调的方法, 在这方法里正式调起UI扩展
- (void)broadcastActivityViewController:(RPBroadcastActivityViewController *)broadcastActivityViewController
didFinishWithBroadcastController:(RPBroadcastController *)broadcastController
error:(NSError *)error {
dispatch_async(dispatch_get_main_queue(), ^{
[broadcastActivityViewController dismissViewControllerAnimated:YES completion:nil];
});
NSLog(@"BundleID %@", broadcastController.broadcastExtensionBundleID);
self.broadcastController = broadcastController;
if (error) {
NSLog(@"BAC: %@ didFinishWBC: %@, err: %@",
broadcastActivityViewController,
broadcastController,
error);
return;
}
[broadcastController startBroadcastWithHandler:^(NSError * _Nullable error) {
if (!error) {
NSLog(@"--fshfka----success");
}
else {
NSLog(@"startBroadcast %@",error.localizedDescription);
}
}];
}
// 用来接收直播传回来的NSDictionary
- (void)broadcastController:(RPBroadcastController *)broadcastController
didUpdateServiceInfo:(NSDictionary *> *)serviceInfo {
NSLog(@"didUpdateServiceInfo: %@", serviceInfo);
}
// 直播关闭
- (void)broadcastController:(RPBroadcastController *)broadcastController
didFinishWithError:(NSError *)error {
NSLog(@"didFinishWithError: %@", error);
}
4、iOS 11
iOS 11官方开放了应用内录屏的流数据处理API，即可直接操作视频流、音频流，而不是只能预览、保存、分享。
- 应用屏幕录制
- (NSString *)videoPath {
if (!_videoPath) {
NSArray *pathDocuments = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *outputURL = pathDocuments[0];
uint32_t random = arc4random() % 1000;
_videoPath = [[outputURL stringByAppendingPathComponent:[NSString stringWithFormat:@"%u", random]] stringByAppendingPathExtension:@"mp4"];
self.compressVideoPath = [[outputURL stringByAppendingPathComponent:[NSString stringWithFormat:@"%u_compress", random]] stringByAppendingPathExtension:@"mp4"];
NSLog(@"%@", _videoPath);
NSLog(@"%@", self.compressVideoPath);
}
return _videoPath;
}
- (AVAssetWriter *)assetWriter {
if (!_assetWriter) {
NSError *error = nil;
_assetWriter = [AVAssetWriter assetWriterWithURL:[NSURL fileURLWithPath:self.videoPath]
fileType:AVFileTypeMPEG4
error:&error];
if (error) {
NSLog(@"初始化 AVAssetWriter 失败：%@", error);
}
if ([_assetWriter canAddInput:self.assetWriterInput]) {
[_assetWriter addInput:self.assetWriterInput];
}
}
return _assetWriter;
}
- (AVAssetWriterInput *)assetWriterInput {
if (!_assetWriterInput) {
NSDictionary *compressionProperties = @{
AVVideoAverageBitRateKey : [NSNumber numberWithDouble:2000 * 1000]
};
NSDictionary *videoSettings = @{
AVVideoCompressionPropertiesKey : compressionProperties,
AVVideoCodecKey : AVVideoCodecH264,
AVVideoWidthKey : [NSNumber numberWithFloat:self.view.frame.size.width],
AVVideoHeightKey : [NSNumber numberWithFloat:self.view.frame.size.height]
};
_assetWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings];
_assetWriterInput.expectsMediaDataInRealTime = YES;
}
return _assetWriterInput;
}
// 开始录屏
[[RPScreenRecorder sharedRecorder] startCaptureWithHandler:^(CMSampleBufferRef _Nonnull sampleBuffer, RPSampleBufferType bufferType, NSError * _Nullable error) {
if (self.assetWriter.status == AVAssetWriterStatusUnknown && bufferType == RPSampleBufferTypeVideo) {
[self.assetWriter startWriting];
CMTime pts = CMSampleBufferGetPresentationTimeStamp(sampleBuffer);
int64_t videopts = CMTimeGetSeconds(pts) * 1000;
// 丢掉无用帧
if (videopts < 0) {
NSLog(@"无用帧");
return ;
}
[self.assetWriter startSessionAtSourceTime:pts];
}
if (self.assetWriter.status == AVAssetWriterStatusFailed) {
NSLog(@"An error occured: %@", self.assetWriter.error);
[self stopRecord:nil];
return;
}
if (bufferType == RPSampleBufferTypeVideo) {
if (self.assetWriterInput.isReadyForMoreMediaData) {
CFRetain(sampleBuffer);
// 将sampleBuffer添加进视频输入源
[self.assetWriterInput appendSampleBuffer:sampleBuffer];
CFRelease(sampleBuffer);
} else {
NSLog(@"Not ready for video");
}
}
} completionHandler:^(NSError * _Nullable error) {
if (error) {
NSLog(@"开始录制error %@",error);
} else {
NSLog(@"开始录制");
}
}];
// 结束录屏
[[RPScreenRecorder sharedRecorder] stopCaptureWithHandler:^(NSError * _Nullable error) {
if (error) {
NSLog(@"stopCaptureWithHandler: %@", error);
}
// 结束写入
__weak typeof(self) weakSelf = self;
[self.assetWriter finishWritingWithCompletionHandler:^{
// 结束录屏
{
self.assetWriter = nil;
self.assetWriterInput = nil;
}
__strong typeof(self) strongSelf = weakSelf;
NSLog(@"屏幕录制结束，视频地址: %@", strongSelf.videoPath);
}];
}];
- 系统屏幕录制
与iOS 10类似，仅在唤起录屏扩展的API中新增了 PreferredExtension 参数（扩展的BundleID），设置了该参数时，唤起的录屏扩展列表中默认选中该扩展
[RPBroadcastActivityViewController loadBroadcastActivityViewControllerWithPreferredExtension:@"com.asiainfo.LivePlay.UIExtension" handler:^(RPBroadcastActivityViewController * _Nullable broadcastActivityViewController, NSError * _Nullable error) {
if (error) {
NSLog(@"RPBroadcast err %@", [error localizedDescription]);
} else {
dispatch_async(dispatch_get_main_queue(), ^{
broadcastActivityViewController.delegate = self;
broadcastActivityViewController.modalPresentationStyle = UIModalPresentationPopover;
[self presentViewController:broadcastActivityViewController animated:YES completion:nil];
});
}
}];
5、iOS 12
应用屏幕录制
同iOS 11系统屏幕录制
可直接在已实现Broadcast Setup UI Extension 和Broadcast Upload Extension扩展的应用中直接使用录屏功能，而不需要在其他应用中唤起。
if (@available(iOS 12, *)) {
if (!self.broadPickerView) {
self.broadPickerView = [[RPSystemBroadcastPickerView alloc] initWithFrame:CGRectMake(-100, -100, 100, 100)];
self.broadPickerView.preferredExtension = @"com.asiainfo.LivePlay.UploadExtension";
self.broadPickerView.showsMicrophoneButton = YES;
[self.view addSubview:self.broadPickerView];
}
}
for (UIView *subView in self.broadPickerView.subviews) {
if ([subView isKindOfClass:[UIButton class]]) {
[(UIButton *)subView sendActionsForControlEvents:UIControlEventTouchDown];
break;
}
}