//删除本地文件夹下保存的文件

                    NSFileManager *fileManager = [NSFileManager defaultManager];

                    NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];

                    NSString *dicrectoryPath = [docPath stringByAppendingPathComponent:@"Pic"];

                   

                    NSArray *fileList = [[NSArray alloc] init];

                    //fileList便是包含有该文件夹下所有文件的文件名及文件夹名的数组

                    fileList = [fileManager contentsOfDirectoryAtPath:dicrectoryPath error:nil];

                    for (NSString *path in fileList) {

                        if ([path containsString:@"png"]) {

                            NSString *filePath = [dicrectoryPath stringByAppendingPathComponent:path];

                            BOOL result1 = [fileManager removeItemAtPath:filePath error:nil];

                            if (result1) {

                                NSLog(@"删除成功");

                            }

                        }

                    }

//创建文件  将图片保存到该路径下

 

    NSDate* dat = [NSDate dateWithTimeIntervalSinceNow:0];

    NSTimeInterval a=[dat timeIntervalSince1970]*1000;

    NSString *timeString = [NSString stringWithFormat:@"%.0f", a];

   

    NSFileManager *fileManager = [NSFileManager defaultManager];

    NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)firstObject];

    NSString *dicrectoryPath = [docPath stringByAppendingPathComponent:@"Pic"];

    NSString *filePath;

    BOOL rel = [fileManager fileExistsAtPath:dicrectoryPath isDirectory:nil];

    if (rel) {

        NSLog(@"存在文件夹");

       

        filePath = [dicrectoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@%@.png", [[DataHandle shareDataHandle] getLocalData:USERID], timeString]];

    } else {

        NSLog(@"不存在文件夹");

        NSError *error = nil;

        BOOL result = [fileManager createDirectoryAtPath:dicrectoryPath withIntermediateDirectories:YES attributes:nil error:&error];

        if (result) {

            filePath = [dicrectoryPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@%@.png", [[DataHandle shareDataHandle] getLocalData:USERID], timeString]];

        }

    }

    [data writeToFile:filePath atomically:YES];