短视频开发，录制视频添加背景音乐功能实现

短视频开发，会在视频录制时提供相关的背景音乐选择，看似简单的选取背景音乐，但对开发人员来说却不是那么简单，如何实现短视频开发录制视频添加背景音乐功能呢？

1.短视频开发在录制界面点击音乐，绘制UI

添加搜索框

-(UIView *)searchBg {
    if (!_searchBg) {
        _searchBg = [[UIView alloc]initWithFrame:CGRectMake(0,64+statusbarHeight,_window_width,44)];
        _searchBg.backgroundColor = [UIColor whiteColor];
        
        _search = [[UISearchBar alloc]initWithFrame:CGRectMake(0,0, _window_width,44)];
        _search.backgroundImage = [PublicObj getImgWithColor:[UIColor whiteColor]];
        _search.placeholder = @"搜索歌曲名称";
        _search.delegate = self;
        UITextField *textField ;
        if (@available(iOS 13.0,*)) {
            textField = _search.searchTextField;
        }else {
           textField = [_search valueForKey:@"_searchField"];
        }
        [textField setBackgroundColor:RGB_COLOR(@"#f9fafb", 1)];
//        [textField setValue:GrayText forKeyPath:@"_placeholderLabel.textColor"];
//        [textField setValue:[UIFont systemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];
        UIButton *clearBtn = [textField valueForKey:@"_clearButton"];
        [clearBtn addTarget:self action:@selector(clickClearBtn) forControlEvents:UIControlEventTouchUpInside];
        textField.textColor = GrayText;
        textField.layer.cornerRadius = 18;
        textField.layer.masksToBounds = YES;
        [_searchBg addSubview:_search];
    }
    return _searchBg;
}

2.短视频开发添加音乐分类界面

 - (MusicHeaderView *)musicClassV {
    if (!_musicClassV) {
        //5个像素空隙
        classHeight = _window_width/5.5+60;
        YBWeakSelf;
        _musicClassV = [[MusicHeaderView alloc]initWithFrame:CGRectMake(0, _searchBg.bottom+5, _window_width, classHeight) withBlock:^(NSString *type, NSString *title) {
            //停止播放音乐
            [weakSelf stopMusic];
            
            MusicClassVC *classVC = [[MusicClassVC alloc]init];
            classVC.navi_title = title;
            classVC.class_id = type;
            if ([_fromWhere isEqual:@"edit"]) {
                classVC.fromWhere = _fromWhere;
            }
            classVC.backEvent = ^(NSString *type, NSString *loadPath, NSString *songID) {
                //从音乐分类中返回事件
                if (weakSelf.pathEvent && [type isEqual:@"分类音乐"]) {
                    weakSelf.pathEvent(loadPath, songID);
                }
                [weakSelf dismissViewControllerAnimated:YES completion:nil];
                
            };
            [weakSelf.navigationController pushViewController:classVC animated:YES];
        }];
        
        _musicClassV.segEvent = ^(NSString *type) {
            //重置部分属性
            [weakSelf resetAttribute];
            [weakSelf stopMusic];
            if ([type isEqual:@"热门"]) {
                _isColl = NO;
                [weakSelf pullTopTenMusic];
            }else{//收藏
                _isColl = YES;
                [weakSelf pullCollectMusic];
            }
        };
        
    }
    return _musicClassV;
}

3.添加音乐列表

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    MusicCell *cell = [MusicCell cellWithTab:tableView andIndexPath:indexPath];
    //10-31添加
    (self.curRow == (int)indexPath.row && self.isOpen) ? (cell.startRecoedBtn.hidden = NO) : (cell.startRecoedBtn.hidden = YES);
    
    cell.backgroundColor = [UIColor whiteColor];
    MusicModel *model = _models[indexPath.row];
    cell.model = model;
    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    YBWeakSelf;
    //回调事件处理
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *docDir = [paths objectAtIndex:0];
    NSString *loadPath = [docDir stringByAppendingFormat:@"/*%@*%@*%@*%@.mp3",model.musicNameStr,model.singerStr,model.timeStr,model.songID];
    cell.recordEvent = ^(NSString *type) {
        //停止播放音乐
        [weakSelf stopMusic];
        //开拍之前()---开拍之后(编辑页面)
        if ([_fromWhere isEqual:@"edit"]) {
            //回调音频路径
            if (weakSelf.pathEvent) {
                weakSelf.pathEvent(loadPath, model.songID);
            }
            [weakSelf dismissViewControllerAnimated:YES completion:nil];
        }else{
            TCVideoRecordViewController *videoRecord = [TCVideoRecordViewController new];
            videoRecord.musicPath = loadPath;
            videoRecord.musicID = model.songID;
            videoRecord.haveBGM = YES;
            UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:videoRecord];
            nav.navigationBarHidden = YES;
            nav.modalPresentationStyle = 0;
            [self presentViewController:nav animated:YES completion:nil];
        }
    };
    __weak MusicCell *weakCell = cell;
    cell.rsEvent = ^(NSString *rs, NSString *erro) {
        if ([rs isEqual:@"sucess"]) {
            [weakSelf stopMusic];
             [weakSelf playMusic:loadPath currentCell:weakCell currentIndex:indexPath];
        }else{
            [MBProgressHUD showPop:erro];
        }
        [[JCHATAlertViewWait ins] hidenAll];
    };
    cell.selectedBackgroundView = [[UIImageView alloc]initWithImage:[PublicObj getImgWithColor:SelCell_Col]];
    return cell;
}

4.要求短视频开发，在点击列表音乐时，下载并播放音乐试听

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    [self.tableView deselectRowAtIndexPath:indexPath animated:YES];
    
    MusicCell *cell = (MusicCell *)[tableView cellForRowAtIndexPath:indexPath];
    MusicModel *model = _models[indexPath.row];
    if (self.curRow == (int)indexPath.row) {
        self.curRow = -99999;
        self.isOpen = NO;
        [self stopMusic];
        [tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
        return;
    }else{
        self.isOpen = YES;
    }
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *docDir = [paths objectAtIndex:0];
    NSString *loadPath = [docDir stringByAppendingFormat:@"/*%@*%@*%@*%@.mp3",model.musicNameStr,model.singerStr,model.timeStr,model.songID];
    NSFileManager *manager = [NSFileManager defaultManager];
    if ([manager fileExistsAtPath:loadPath]) {
        //已下载
        [self playMusic:loadPath currentCell:cell currentIndex:indexPath];
    }else{
        [[JCHATAlertViewWait ins] showInView];
        //下载歌曲
        [cell musicDownLoad];
    }
    //处理显示、隐藏开拍按钮
    if (self.curRow == (int)indexPath.row) {
        return;
    }
    MusicCell *lastCell = (MusicCell *)[tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:self.curRow inSection:0]];
    [lastCell.StateBtn setImage:[UIImage imageNamed:@"music_play"] forState:0];
    self.isOpen = YES;
    self.curRow = (int)indexPath.row;
    
    /** 刷新tableView，系统默认会有一个自带的动画 */
    [tableView beginUpdates];
    
    //10-31添加
    lastCell.startRecoedBtn.hidden = YES;
    cell.startRecoedBtn.hidden = NO;
    //(self.curRow == (int)indexPath.row && self.isOpen) ? (cell.startRecoedBtn.hidden = NO) : (cell.startRecoedBtn.hidden = YES);
    
    [tableView endUpdates];
    
}

5.确认使用音乐后，下一步编辑音乐时传相应路径

  TCVideoEditViewController *vc = [[TCVideoEditViewController alloc] init];
    vc.isAlbum = isAlbum;
    [vc setVideoPath:recordResult.videoPath];
    vc.musicPath = _musicPath;
    vc.musicID = _musicID;
    vc.haveBGM = _haveBGM;
    vc.isTakeSame = _isTakeSame;
    vc.recordType = _recordType;
    [self.navigationController pushViewController:vc animated:YES];
    
    [self releaseEditor];

以上就是实现短视频开发，添加背景音乐功能的实现相关代码，希望能给各位提供帮助，更多短视频开发内容欢迎关注之后的文章。

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