IOS在Document目录下创建文件夹、保存、读取、以及删除文件

     //  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);