前一段時間剛剛做了一個短視頻功能，然后今天給小伙伴們分享視頻裁剪這一塊的代碼，今天時間比較緊，我就直接把工具類的代碼分享給小伙伴們吧，哪里不理解的可以在下面留言給我

視頻裁剪

• SHMediaManager.h

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface SHMediaManager : NSObject

+ (void)cropWithVideoUrlStr:(NSURL *)videoUrl start:(CGFloat)startTime end:(CGFloat)endTime completion:(void (^)(NSURL *outputURL, Float64 videoDuration, BOOL isSuccess))completionHandle;

@end

注：這里videoUrl參數(shù)是本地視頻文件的路徑

• SHMediaManager.m

#import "SHMediaManager.h"
#import <AVFoundation/AVFoundation.h>

@implementation SHMediaManager
+ (void)cropWithVideoUrlStr:(NSURL *)videoUrl start:(CGFloat)startTime end:(CGFloat)endTime completion:(void (^)(NSURL *outputURL, Float64 videoDuration, BOOL isSuccess))completionHandle
{
    AVURLAsset *asset =[[AVURLAsset alloc] initWithURL:videoUrl options:nil];
    
    NSString *docDirPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES) objectAtIndex:0];
    NSString *outputFilePath = [NSString stringWithFormat:@"%@/%@.mp4", docDirPath , [self getCurrentTime]];
    NSURL *outputFileUrl = [NSURL fileURLWithPath:outputFilePath];
    
    NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:asset];
    if ([compatiblePresets containsObject:AVAssetExportPresetMediumQuality])
    {
        
        AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]
                                               initWithAsset:asset presetName:AVAssetExportPresetPassthrough];
        
        NSURL *outputURL = outputFileUrl;
        
        exportSession.outputURL = outputURL;
        exportSession.outputFileType = AVFileTypeMPEG4;
        exportSession.shouldOptimizeForNetworkUse = YES;
        
        CMTime start = CMTimeMakeWithSeconds(startTime, asset.duration.timescale);
        CMTime duration = CMTimeMakeWithSeconds(endTime,asset.duration.timescale);
        CMTimeRange range = CMTimeRangeMake(start, duration);
        exportSession.timeRange = range;
        
        [exportSession exportAsynchronouslyWithCompletionHandler:^{
            
            switch ([exportSession status]) {
                case AVAssetExportSessionStatusFailed:
                {
                    NSLog(@"合成失?。?@", [[exportSession error] description]);
                    completionHandle(outputURL, endTime, NO);
                }
                    break;
                case AVAssetExportSessionStatusCancelled:
                {
                    completionHandle(outputURL, endTime, NO);
                }
                    break;
                case AVAssetExportSessionStatusCompleted:
                {
                    completionHandle(outputURL, endTime, YES);
                }
                    break;
                default:
                {
                    completionHandle(outputURL, endTime, NO);
                } break;
            }
        }];
    }
}

//獲取當前時間
+ (NSString *)getCurrentTime {
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSString *dateTime = [formatter stringFromDate:[NSDate date]];
    return dateTime;
}


@end

注：以上block回調(diào)的方式比較簡單，小伙伴們可以按照自己的需求進行更改，例如添加一個裁剪失敗報錯的block回調(diào)等

demo：https://github.com/xiesha/SHMediaClipDemo