Question

我是Iphone开发新手，我在本地保存了一个xml文件，并使用NSXmlParser（存储在Resource文件夹中）显示详细信息。但是，现在我想从url（从客户端）下载新的xml，并且需要将新的xml文件存储在Cache目录中，并且还要从资源文件夹中删除xml文件。但是我没有解析缓存目录中的新xml文件，如何从缓存目录中解析新的xml文件？任何人都知道这一点，请帮帮我

Answer 1

我实际上刚刚为我的一个项目编写了这个功能。我将分享以前用来保存XML文件并将其写入缓存的代码。

- (NSString *)XMLCacheFilePath 
{
    NSString *directory = @"/Library/Caches/XML/";
    NSString *fileName = [@"file" stringByAppendingPathExtension:@"xml"];

    // Setup directory path
    NSString *homeDirectoryPath = NSHomeDirectory();
    NSString *unexpandedDirectoryPath = [homeDirectoryPath stringByAppendingString:directory];
    NSString *directoryPath = [NSString pathWithComponents:[NSArray arrayWithObjects:
                                                        [NSString stringWithString:[unexpandedDirectoryPath stringByExpandingTildeInPath]], 
                                                        nil]];

    // Setup file path
    NSString *unexpandedFilePath = [directoryPath stringByAppendingPathComponent:fileName];
    NSString *filePath = [NSString pathWithComponents:[NSArray arrayWithObjects:
                                                        [NSString stringWithString:[unexpandedFilePath stringByExpandingTildeInPath]], 
                                                        nil]];

    if (![[NSFileManager defaultManager] fileExistsAtPath:directoryPath isDirectory:nil]) {
        NSError *error = [[NSError alloc] init];

        [[NSFileManager defaultManager] createDirectoryAtPath:directoryPath
                              withIntermediateDirectories:YES
                                               attributes:nil
                                                    error:&error];                
    }

    return filePath;
}

- (void)saveXMLStringToDisk:(NSString *)xmlString
{
    NSError *error;

    [xmlString writeToFile:self.XMLCacheFilePath
                atomically:YES
                  encoding:NSUTF8StringEncoding
                     error:&error];
}

- (NSString *)XMLStringFromDisk
{
    NSString *XMLString = [NSString stringWithContentsOfFile:self.XMLCacheFilePath
                                                    encoding:NSUTF8StringEncoding
                                                       error:nil];

    return XMLString;
}

如何从Cachedirectory中检索Xml文件？

1 个答案: