//  在Documents目录下创建一个名为LaunchImage的文件夹

     NSString *path = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"LaunchImage"];

     NSLog(@"%@",path);

     NSFileManager *fileManager = [NSFileManager defaultManager];

     BOOL isDir = FALSE;

     BOOL isDirExist = [fileManager fileExistsAtPath:path isDirectory:&isDir];

     if(!(isDirExist && isDir))

     {

         BOOL bCreateDir = [fileManager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];

         if(!bCreateDir){

             NSLog(@"创建文件夹失败！");

         }

         NSLog(@"创建文件夹成功，文件路径%@",path);

     }

     UIImage *image=[UIImage imageWithContentsOfFile:@"testimage.png"];

     NSData *data = UIImagePNGRepresentation(image);

     //将testimage.png保存到LaunchImage文件夹下，新名称为image1.png

          BOOL isSaved=   [fileManager createFileAtPath:[path stringByAppendingString:@"/image1.png"] contents:data attributes:nil];

     NSLog(@"图片保存状态：%d",isSaved);

     //获取保存的图片

     UIImage *newimage=[UIImage imageWithContentsOfFile:[path stringByAppendingString:@"/image1.png"]];

 //   删除文件

      BOOL isDelete=[fileManager removeItemAtPath:path error:nil];

     NSLog(@"%d",isDelete);