#pragma mark 创建文件夹       ---这里可以传文件夹的名字进去 进行创建
- (NSString *)dataPath:(NSString *)file
{
    NSString *path = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"你想要的文件夹名字"];
    
    BOOL bo = [[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
    NSAssert(bo,@"创建目录失败");

    NSString *result = [path stringByAppendingPathComponent:file];
    
    return result;
}


//使用如下
//创建保存的文件路径
<pre name="code" class="objc">NSString *norPicPath = [self dataPath:[NSString stringWithFormat:@"%@.jpg",currentAccid]];
  NSLog(@"filepath: %@",norPicPath);
        
 BOOL norResult = [picData writeToFile:norPicPath atomically:YES]
?if (norResult) {
?//保存成功之后
?    nslog(@"保存成功");
 }else {
     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"文件保存不成功" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
    ?[alert show];
 }