缓存写入文件

Posted 2022-12-02 zhangyulin311

- (void)writeToCaches:(NSString *)url

    NSString * htmlResponseStr = [NSString stringWithContentsOfURL:[NSURL URLWithString:url] encoding:NSUTF8StringEncoding error:Nil];

    //创建文件管理器

    NSFileManager *fileManager = [[NSFileManager alloc]init];

    //获取document路径,括号中属性为当前应用程序独享

    NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,      NSUserDomainMask, YES) objectAtIndex:0];

    [fileManager createDirectoryAtPath:[cachesPath stringByAppendingString:@"/Caches"] withIntermediateDirectories:YES attributes:nil error:nil];

    //定义记录文件全名以及路径的字符串filePath

    NSString * path = [cachesPath stringByAppendingString:[NSString stringWithFormat:@"/Caches/%lu.html",(unsigned long)[_urlStr hash]]];

    

    [htmlResponseStr writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:nil];

// 取本地缓存

    NSString *cachesPath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,      NSUserDomainMask, YES) objectAtIndex:0];

    NSString * path = [cachesPath stringByAppendingString:[NSString stringWithFormat:@"/Caches/%lu.html",(unsigned long)[_urlStr hash]]];

    NSString *htmlString = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];

    if (!(htmlString == nil || [htmlString isEqualToString:@""]))

        // 如果有缓存就取缓存，没有就请求

        [_webView loadHTMLString:htmlString baseURL:[NSURL URLWithString:_urlStr]];

    else

        // 新的链接走这里进行缓存

        NSURL *url = [NSURL URLWithString:_urlStr];

         NSMutableURLRequest *request =[NSMutableURLRequest requestWithURL:url];

        [_webView loadRequest:request];

        [self writeToCaches:_urlStr];