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前言
ReplayKit 是WWDC15推出的苹果原生录屏 API。在iOS9的时候主要提供的是录屏，录制完成后可以进行查看、编辑、通过指定方式分享出去。
在WWDC16上新版的 ReplayKit 提出了了 live 功能，简单说就是通过 ReplayKit 可以进行录屏直播。这对于苹果的手游直播行业有着很重要的意义。
首先给出视频地址和API文档
- Go Live with ReplayKit - WWDC 2016
- ReplayKit API Reference
简单测试
弹出可以接收广播的服务列表
新建工程，然后加入ReplayKit.frameword
添加一个按钮，然后按钮点击事件弹出广播服务的列表：
- (IBAction)displayServiceViewController:(id)sender {
[RPBroadcastActivityViewController loadBroadcastActivityViewControllerWithHandler:^(RPBroadcastActivityViewController * _Nullable broadcastActivityViewController, NSError * _Nullable error) {
broadcastActivityViewController.delegate = self;
[self presentViewController:broadcastActivityViewController animated:YES completion:nil];
}];
}
Mobcrush
所以想要直播的游戏本身添加这样一个逻辑，弹出服务列表即可。而直播软件也只需要注册为直播服务，就可以直播任何支持的游戏，软件。国外最火最先支持的就是示例中左边的Mobcrush，官网,里面有手机游戏Tower Dash的直播，就是使用这个技术实现的，Tower Dash游戏直播页面为 - 这里这里，需要科学上网。
我录制了动态图展示：
动态图中可以看出支持摄像头录制，当然还有麦克风，这些已经满足了日常主播的基本需求。
国内
国内现在映客直播安装就直接有注册为广播服务，所以截图中列表里就有。我还安装了熊猫TV，虎牙直播，虎牙助手，虎牙手游。熊猫TV的主播权限还没有申请下来。虎牙手游貌似使用的也是这个技术，但是实现不一样，虎牙手游直接是在虎牙手游APP内部打开直播，提示成功之后，直接就进入了录屏模式，然后退出返回到手游界面开始游戏就可以。查看了虎牙直播平台，已经有主播使用了iPhone7进行王者荣耀直播，熊猫TV暂时还没有看到用iPhone直播手游的。
WWDC 2016
下面是观看WWDC16 记录的知识片段。
ReplayKit
新特性：
- Apple TV support
- Live Broadcasting 直播广播，这个很有用，就是要研究的直播功能
- 可以记录 Face Time摄像头的内容，增强了麦克风记录API
录播功能
对于录播功能之前就已经有了一个典型的demo，可以直接看下面代码，放进原始功能的第一个viewcontroller里面就Ok了。
#import "ViewController.h"
#import <ReplayKit/ReplayKit.h>
static NSString *StartRecord = @"开始";
static NSString *StopRecord = @"结束";
#if TARGET_IPHONE_SIMULATOR
#define SIMULATOR 1
#elif TARGET_OS_IPHONE
#define SIMULATOR 0
#endif
#define AnimationDuration (0.3)
@interface ViewController () <RPPreviewViewControllerDelegate>
{
}
@property (nonatomic, strong)UIButton *btnStart;
@property (nonatomic, strong)UIButton *btnStop;
@property (nonatomic, strong)NSTimer *progressTimer;
@property (nonatomic, strong)UIProgressView *progressView;
@property (nonatomic, strong)UIActivityIndicatorView *activity;
@property (nonatomic, strong)UIView *tipView;
@property (nonatomic, strong)UILabel *lbTip;
@property (nonatomic, strong)UILabel *lbTime;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidAppear:(BOOL)animated {
BOOL isVersionOk = [self isSystemVersionOk];
if (!isVersionOk) {
NSLog(@"系统版本需要是iOS9.0及以上才支持ReplayKit");
return;
}
if (SIMULATOR) {
[self showSimulatorWarning];
return;
}
UILabel *lb = nil;
CGSize screenSize = [UIScreen mainScreen].bounds.size;
//标题
lb = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
lb.font = [UIFont boldSystemFontOfSize:];
lb.backgroundColor = [UIColor clearColor];
lb.textColor = [UIColor blackColor];
lb.textAlignment = NSTextAlignmentCenter;
lb.numberOfLines = ;
lb.text = @"苹果ReplayKit Demo";
lb.center = CGPointMake(screenSize.width/, );
[self.view addSubview:lb];
//创建按钮
UIButton *btn = [self createButtonWithTitle:StartRecord andCenter:CGPointMake(screenSize.width/ - , )];
[self.view addSubview:btn];
self.btnStart = btn;
btn = [self createButtonWithTitle:StopRecord andCenter:CGPointMake(screenSize.width/ + , )];
[self.view addSubview:btn];
self.btnStop = btn;
[self setButton:btn enabled:NO];
//loading指示
UIActivityIndicatorView *activity = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(, , , )];
[self.view addSubview:view];
view.backgroundColor = [UIColor redColor];
view.layer.cornerRadius = f;
view.center = CGPointMake(screenSize.width/, );
activity.center = CGPointMake(, view.frame.size.height/);
[view addSubview:activity];
[activity startAnimating];
self.activity = activity;
lb = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
lb.font = [UIFont boldSystemFontOfSize:];
lb.backgroundColor = [UIColor clearColor];
lb.textColor = [UIColor blackColor];
lb.layer.cornerRadius = ;
lb.textAlignment = NSTextAlignmentCenter;
[view addSubview:lb];
self.lbTip = lb;
self.tipView = view;
[self hideTip];
//显示时间（用于看录制结果时能知道时间）
lb = [[UILabel alloc] initWithFrame:CGRectMake(, , , )];
lb.font = [UIFont boldSystemFontOfSize:];
lb.backgroundColor = [UIColor redColor];
lb.textColor = [UIColor blackColor];
lb.layer.cornerRadius = ;
NSDateFormatter * dateFormat = [[NSDateFormatter alloc] init] ;
[dateFormat setDateFormat: @"HH:mm:ss"];
NSString *dateString = [dateFormat stringFromDate:[NSDate date]];
lb.text = dateString;
lb.center = CGPointMake(screenSize.width/, screenSize.height/ + );
lb.textAlignment = NSTextAlignmentCenter;
[self.view addSubview:lb];
self.lbTime = lb;
//进度条 （显示动画，不然看不出画面的变化）
UIProgressView *progress = [[UIProgressView alloc] initWithFrame:CGRectMake(, , screenSize.width*, )];
progress.center = CGPointMake(screenSize.width/, screenSize.height/ + );
progress.progressViewStyle = UIProgressViewStyleDefault;
progress.progress = ;
[self.view addSubview:progress];
self.progressView = progress;
//计时器
//更新时间
[NSTimer scheduledTimerWithTimeInterval:f
target:self
selector:@selector(updateTimeString)
userInfo:nil
repeats:YES];
}
#pragma mark - UI控件
//显示 提示信息
- (void)showTipWithText:(NSString *)tip activity:(BOOL)activity{
[self.activity startAnimating];
self.lbTip.text = tip;
self.tipView.hidden = NO;
if (activity) {
self.activity.hidden = NO;
[self.activity startAnimating];
} else {
[self.activity stopAnimating];
self.activity.hidden = YES;
}
}
//隐藏 提示信息
- (void)hideTip {
self.tipView.hidden = YES;
[self.activity stopAnimating];
}
//创建按钮
- (UIButton *)createButtonWithTitle:(NSString *)title andCenter:(CGPoint)center {
CGRect rect = CGRectMake(, , , );
UIButton *btn = [[UIButton alloc] initWithFrame:rect];
btn.layer.cornerRadius = ;
btn.layer.borderWidth = ;
btn.layer.borderColor = [[UIColor blackColor] CGColor];
btn.backgroundColor = [UIColor lightGrayColor];
btn.center = center;
[btn setTitle:title forState:UIControlStateNormal];
[btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[btn addTarget:self action:@selector(onBtnPressed:) forControlEvents:UIControlEventTouchDown];
return btn;
}
//设置按钮是否可点击
- (void)setButton:(UIButton *)button enabled:(BOOL)enabled {
if (enabled) {
button.alpha = ;
} else {
button.alpha = ;
}
button.enabled = enabled;
}
//提示不支持模拟器
- (void)showSimulatorWarning {
UIAlertAction *actionOK = [UIAlertAction actionWithTitle:@"好的" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){
}];
UIAlertAction *actionCancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action){
}];
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"ReplayKit不支持模拟器" message:@"请使用真机运行这个Demo工程" preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:actionCancel];
[alert addAction:actionOK];
[self presentViewController:alert animated:NO completion:nil];
}
//显示弹框提示
- (void)showAlert:(NSString *)title andMessage:(NSString *)message {
if (!title) {
title = @"";
}
if (!message) {
message = @"";
}
UIAlertAction *actionCancel = [UIAlertAction actionWithTitle:@"好的" style:UIAlertActionStyleCancel handler:nil];
UIAlertController *alert = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:actionCancel];
[self presentViewController:alert animated:NO completion:nil];
}
//显示视频预览页面，animation=是否要动画显示
- (void)showVideoPreviewController:(RPPreviewViewController *)previewController withAnimation:(BOOL)animation {
__weak ViewController *weakSelf = self;
//UI需要放到主线程
dispatch_async(dispatch_get_main_queue(), ^{
CGRect rect = [UIScreen mainScreen].bounds;
if (animation) {
rect.origin.x += rect.size.width;
previewController.view.frame = rect;
rect.origin.x -= rect.size.width;
[UIView animateWithDuration:AnimationDuration animations:^(){
previewController.view.frame = rect;
} completion:^(BOOL finished){
}];
} else {
previewController.view.frame = rect;
}
[weakSelf.view addSubview:previewController.view];
[weakSelf addChildViewController:previewController];
});
}
//关闭视频预览页面，animation=是否要动画显示
- (void)hideVideoPreviewController:(RPPreviewViewController *)previewController withAnimation:(BOOL)animation {
//UI需要放到主线程
dispatch_async(dispatch_get_main_queue(), ^{
CGRect rect = previewController.view.frame;
if (animation) {
rect.origin.x += rect.size.width;
[UIView animateWithDuration:AnimationDuration animations:^(){
previewController.view.frame = rect;
} completion:^(BOOL finished){
//移除页面
[previewController.view removeFromSuperview];
[previewController removeFromParentViewController];
}];
} else {
//移除页面
[previewController.view removeFromSuperview];
[previewController removeFromParentViewController];
}
});
}
#pragma mark - 按钮 回调
//按钮事件
- (void)onBtnPressed:(UIButton *)sender {
//点击效果
sender.transform = CGAffineTransformMakeScale(, );
float duration = ;
[UIView animateWithDuration:duration
animations:^{
sender.transform = CGAffineTransformMakeScale(, );
}completion:^(BOOL finish){
[UIView animateWithDuration:duration
animations:^{
sender.transform = CGAffineTransformMakeScale(, );
}completion:^(BOOL finish){ }];
}];
NSString *function = sender.titleLabel.text;
if ([function isEqualToString:StartRecord]) {
[self startRecord];
}
else if ([function isEqualToString:StopRecord]) {
[self stopRecord];
}
}
- (void)startRecord {
// [self setButton:self.btnStart enabled:NO];
NSLog(@"ReplayKit只支持真机录屏，支持游戏录屏，不支持录avplayer播放的视频");
NSLog(@"检查机器和版本是否支持ReplayKit录制...");
if ([[RPScreenRecorder sharedRecorder] isAvailable]) {
NSLog(@"支持ReplayKit录制");
} else {
NSLog(@"!!不支持支持ReplayKit录制!!");
return;
}
__weak ViewController *weakSelf = self;
NSLog(@"%@ 录制", StartRecord);
[self showTipWithText:@"录制初始化" activity:YES];
[[RPScreenRecorder sharedRecorder] startRecordingWithHandler:^(NSError *error){
NSLog(@"录制开始...");
[weakSelf hideTip];
if (error) {
NSLog(@"错误信息 %@", error);
[weakSelf showTipWithText:error.description activity:NO];
} else {
//其他处理
[weakSelf setButton:self.btnStop enabled:YES];
[weakSelf setButton:self.btnStart enabled:NO];
[weakSelf showTipWithText:@"正在录制" activity:NO];
//更新进度条
weakSelf.progressTimer = [NSTimer scheduledTimerWithTimeInterval:f
target:self
selector:@selector(changeProgressValue)
userInfo:nil
repeats:YES];
}
}];
}
- (void)stopRecord {
NSLog(@"%@ 录制", StopRecord);
[self setButton:self.btnStart enabled:YES];
[self setButton:self.btnStop enabled:NO];
__weak ViewController *weakSelf = self;
[[RPScreenRecorder sharedRecorder] stopRecordingWithHandler:^(RPPreviewViewController *previewViewController, NSError * error){
if (error) {
NSLog(@"失败消息:%@", error);
[weakSelf showTipWithText:error.description activity:NO];
} else {
[weakSelf showTipWithText:@"录制完成" activity:NO];
//显示录制到的视频的预览页
NSLog(@"显示预览页面");
previewViewController.previewControllerDelegate = weakSelf;
//去除计时器
[weakSelf.progressTimer invalidate];
weakSelf.progressTimer = nil;
[self showVideoPreviewController:previewViewController withAnimation:YES];
}
}];
}
#pragma mark - 视频预览页面 回调
//关闭的回调
- (void)previewControllerDidFinish:(RPPreviewViewController *)previewController {
[self hideVideoPreviewController:previewController withAnimation:YES];
}
//选择了某些功能的回调（如分享和保存）
- (void)previewController:(RPPreviewViewController *)previewController didFinishWithActivityTypes:(NSSet <NSString *> *)activityTypes {
__weak ViewController *weakSelf = self;
if ([activityTypes containsObject:@"com.apple.UIKit.activity.SaveToCameraRoll"]) {
dispatch_async(dispatch_get_main_queue(), ^{
[weakSelf showAlert:@"保存成功" andMessage:@"已经保存到系统相册"];
});
}
if ([activityTypes containsObject:@"com.apple.UIKit.activity.CopyToPasteboard"]) {
dispatch_async(dispatch_get_main_queue(), ^{
[weakSelf showAlert:@"复制成功" andMessage:@"已经复制到粘贴板"];
});
}
}
#pragma mark - 计时器 回调
//改变进度条的显示的进度
- (void)changeProgressValue {
float progress = self.progressView.progress + ;
[self.progressView setProgress:progress animated:NO];
if (progress >= ) {
self.progressView.progress = ;
}
}
//更新显示的时间
- (void)updateTimeString {
NSDateFormatter * dateFormat = [[NSDateFormatter alloc] init] ;
[dateFormat setDateFormat: @"HH:mm:ss"];
NSString *dateString = [dateFormat stringFromDate:[NSDate date]];
self.lbTime.text = dateString;
}
#pragma mark - 其他
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//判断对应系统版本是否支持ReplayKit
- (BOOL)isSystemVersionOk {
if ([[UIDevice currentDevice].systemVersion floatValue] < ) {
return NO;
} else {
return YES;
}
}
@end
新博客文章地址：ReplayKit库，iOS原生直播神器