UIWebView缓存

最新推荐文章于 2018-11-07 21:28:00 发布

转载最新推荐文章于 2018-11-07 21:28:00 发布 · 410 阅读

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本文介绍了一种在iOS应用中实现网页缓存的方法。具体步骤包括：检查缓存是否存在并有效，若存在则直接从缓存加载网页到WebView；若不存在，则从网络加载并同时写入缓存。该方法能有效减少网络请求次数，提高用户体验。

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viewDidLoad里边代码如下:_urlStr为网页链接

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

NSString * path = [cachesPathstringByAppendingString:[NSStringstringWithFormat:@"/Caches/%lu.html",(unsignedlong)[_urlStrhash]]];

NSString *htmlString = [NSStringstringWithContentsOfFile:pathencoding:NSUTF8StringEncodingerror:nil];

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

[_webViewloadHTMLString:htmlStringbaseURL:[NSURLURLWithString:_urlStr]];

}else{

NSURL *url = [NSURLURLWithString:_urlStr];

NSURLRequest *request = [NSURLRequestrequestWithURL:url];

[_webViewloadRequest:request];

[selfwriteToCache];

}

/**

* 网页缓存写入文件

- (void)writeToCache

{

NSString * htmlResponseStr = [NSStringstringWithContentsOfURL:[NSURLURLWithString:_urlStr]encoding:NSUTF8StringEncodingerror:Nil];

//创建文件管理器

NSFileManager *fileManager = [[NSFileManageralloc]init];

//获取document路径

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

[fileManager createDirectoryAtPath:[cachesPathstringByAppendingString:@"/Caches"]withIntermediateDirectories:YESattributes:nilerror:nil];

//写入路径

NSString * path = [cachesPathstringByAppendingString:[NSStringstringWithFormat:@"/Caches/%lu.html",(unsignedlong)[_urlStrhash]]];

[htmlResponseStr writeToFile:pathatomically:YESencoding:NSUTF8StringEncodingerror:nil];

}