前言:

随着上一篇 IJK 成功播放了视频，又来了新的需求，那就是，要录制直播中的一段视频，保存到用户相册。

代码地址： https://github.com/gityuency/ObjectiveCTools
类名：【RecordingViewController】

ReplayKit 出现在 iOS 9 ，所以低版本没法玩。但是在 iOS 9 和 iOS 10上差了一个属性。就是 movieURL。本篇示例代码在 iOS 9 上是弹出视图让用户操作，在 iOS 10 上录制完成直接保存。开始和结束，就两句代码。

第一步写代码

YXReplayManager.h

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface YXReplayManager : NSObject

/// 单例对象
+ (instancetype)sharedManager;

/// 用于查看相册和麦克风权限是否已经获取;
+ (void)demandForAuthorization:(void(^)(void))authorizedResultBlock;

/// 开始记录
- (void)startRecording;

/// 停止记录
- (void)stopRecording;

@end

NS_ASSUME_NONNULL_END

YXReplayManager.m


#import "YXReplayManager.h"
#import <Photos/Photos.h>
#import <ReplayKit/ReplayKit.h>

@interface YXReplayManager() <RPPreviewViewControllerDelegate>

@end

@implementation YXReplayManager

/// 单例对象
static YXReplayManager *_instance;

/// 录制对象
static RPScreenRecorder *recorder;


+ (instancetype)allocWithZone:(struct _NSZone *)zone {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _instance = [super allocWithZone:zone];
        recorder = [RPScreenRecorder sharedRecorder];
        recorder.microphoneEnabled = YES;
    });
    return _instance;
}
+ (instancetype)sharedManager {
    return [[self alloc] init];
}
- (id)copyWithZone:(NSZone *)zone {
    return _instance;
}
- (id)mutableCopyWithZone:(NSZone *)zone {
    return _instance;
}


/// 申请权限
+ (void)demandForAuthorization:(void(^)(void))authorizedResultBlock {
    // 先去 info.plit 开启相册权限,否则真机崩溃
    PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
    if (status == PHAuthorizationStatusAuthorized) {
        if (authorizedResultBlock) {  //已经授权
            authorizedResultBlock();
        }
        NSLog(@"相册权限已经存在");
    } else {
        [PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
            if(status == PHAuthorizationStatusAuthorized) {
                dispatch_async(dispatch_get_main_queue(), ^{
                    if (authorizedResultBlock) {  // 用户点击 "OK"
                        authorizedResultBlock();
                    }
                });
                NSLog(@"相册权限已经授权 用户授权");
            } else {
                NSLog(@"玩你妈嗨");  // 用户点击 不允许访问
            }
        }];
    }
}


#pragma mark - 开始录制
/// 开始记录
- (void)startRecording {
    
    [YXReplayManager demandForAuthorization:^{
        [_instance turnOnRecord];
    }];
}
/// 开始记录
- (void)turnOnRecord {
    
    if (recorder.isRecording) { //已经在录制,就返回
        return;
    }
    
    if (@available(iOS 10.0, *)) {
        [recorder startRecordingWithHandler:^(NSError * _Nullable error) {
            if (!error) {
                NSLog(@"录制开始... 10.0 系统");
            }
        }];
    } else if (@available(iOS 9.0, *)) {
        [recorder startRecordingWithMicrophoneEnabled:YES handler:^(NSError * _Nullable error) {
            if (!error) {
                NSLog(@"录制开始... 9.0 系统");
            }
        }];
    } else {
        NSLog(@"系统版本太低,没法玩.");
    }
}


#pragma mark - 停止录制
/// 停止录制
- (void)stopRecording {
    [_instance turnOffRecord];
}

/// 停止录制
- (void)turnOffRecord {
    
    NSLog(@"结束录制");
    
    dispatch_async(dispatch_get_main_queue(), ^{
        [[RPScreenRecorder sharedRecorder] stopRecordingWithHandler:^(RPPreviewViewController * _Nullable previewViewController, NSError * _Nullable error) {
            NSLog(@"结束回调");
            
            if (error) {  //出错
                NSLog(@"出错: %@", error);
            } else {  //成功回调
                
                if (@available(iOS 10.0, *)) {
                    
                    /*
                     iOS 10 这里我选择直接保存到相册,不使用 previewViewController 弹出来
                     */
                    [self handleiOS10:previewViewController];
                    
                } else if (@available(iOS 9.0, *)) {
                    
                    /*
                     在iOS9 里面取不到 movieURL 这个变量,程序会崩溃. 所以直接弹出这个 previewViewController 让用户来操作保存
                     */
                    [self handleiOS9:previewViewController];
                }
            }
        }];
    });
}

/// 处理 iOS 10
- (void)handleiOS10:(RPPreviewViewController *)previewViewController {
    
    NSURL *videoURL = [previewViewController valueForKey:@"movieURL"];
    
    if (videoURL) {
        BOOL compatible = UIVideoAtPathIsCompatibleWithSavedPhotosAlbum([videoURL path]);
        
        if (compatible) {
            UISaveVideoAtPathToSavedPhotosAlbum([videoURL path], self, @selector(savedPhotoImage:didFinishSavingWithError:contextInfo:), nil);
        }
        
    } else {
        NSLog(@"没有找到 movieURL");
    }
}


/// 处理 iOS 9
- (void)handleiOS9:(RPPreviewViewController *)previewViewController {
    previewViewController.previewControllerDelegate = self;
    [[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:previewViewController animated:YES completion:nil];
}

#pragma mark - RPPreviewViewController 代理,用于 iOS 9
- (void)previewControllerDidFinish:(RPPreviewViewController *)previewController {
    [previewController dismissViewControllerAnimated:YES completion:nil];
    NSLog(@"预览控制器消失");
}

- (void)previewController:(RPPreviewViewController *)previewController didFinishWithActivityTypes:(NSSet <NSString *> *)activityTypes {
    NSLog(@"用户已经操作! %@", activityTypes);
}


#pragma mark - iOS 10 保存视频的回调
/// 保存视频之后的回调,这个方法不能乱写
- (void)savedPhotoImage:(UIImage*)image didFinishSavingWithError: (NSError *)error contextInfo: (void *)contextInfo {
    
    if (error) {
        NSLog(@"保存视频失败!!!");
    } else {
        NSLog(@"已经成功保存了视频!");
    }
}

@end

第二步测试

#import "RecordingViewController.h"
#import "YXReplayManager.h"

@interface RecordingViewController ()

@end

@implementation RecordingViewController

- (void)viewDidLoad {
    [super viewDidLoad];

}

- (IBAction)start:(UIButton *)sender {

    sender.backgroundColor = [UIColor redColor];
    [[YXReplayManager sharedManager] startRecording];

}

- (IBAction)stop:(UIButton *)sender {

    sender.backgroundColor = [UIColor greenColor];
    [[YXReplayManager sharedManager] stopRecording];
}


@end