如何在UIWebView中缓存内容以便稍后加载？ [英] How to cache content in UIWebView for faster loading later on?

问题描述

我注意到iphone safari会缓存内容，以便稍后加载页面的速度要快得多，就像桌面浏览器一样。因此，以移动gmail网页为例，第一次加载非常慢（5-10秒）。但是，如果我关闭标签并重新打开页面，则非常快（1秒）。

但是，如果您通过a加载内容，则此行为不一样UIWebView在您的应用程序。我错过了一些设置？如何让UIWebView自动缓存内容，而无需亲自保存内容？

解决方案

关键是： NSURLRequestReturnCacheDataElseLoad

  NSData * urlData; 
 NSString * baseURLString = @mysite.com; 
 NSString * urlString = [baseURLString stringByAppendingPathComponent：@myfile]; 
 
 NSURLRequest * request = [NSURLRequest requestWithURL：[NSURL URLWithString：urlString] cachePolicy：NSURLRequestReturnCacheDataElseLoad timeoutInterval：10.0]; 
 NSURLConnection * connection = [[NSURLConnection alloc] initWithRequest：request delegate：nil]; 
 
 if（connection）
 {
 urlData = [NSURLConnection sendSynchronousRequest：request]; 
 
 NSString * htmlString = [[NSString alloc] initWithData：urlData encoding：NSUTF8StringEncoding]; 
 [webView loadHTMLString：htmlString baseURL：baseURLString]; 
 [htmlString发布]; 
} 
 
 [连接释放]; 
  

I notice that the iphone safari caches content so that your page load for later is much faster much like a desktop browser. So take mobile gmail web page for example, the first load is quite slow (5-10 secondS). But if I close the tab and reopen the page again, it's very quick (1 second).

However, this behavior is not the same if you load the content through a UIWebView in your app. Am I missing some settings? How do I make the UIWebView cache the content automatically without going through the hassle of saving the content myself?

解决方案

The key is: NSURLRequestReturnCacheDataElseLoad

NSData *urlData;
NSString *baseURLString =  @"mysite.com";
NSString *urlString = [baseURLString stringByAppendingPathComponent:@"myfile"];

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:urlString] cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval: 10.0]; 
NSURLConnection *connection=[[NSURLConnection alloc] initWithRequest:request delegate:nil]; 

if (connection)
{ 
    urlData = [NSURLConnection sendSynchronousRequest: request];

    NSString *htmlString = [[NSString alloc] initWithData:urlData encoding:NSUTF8StringEncoding];
    [webView loadHTMLString:htmlString baseURL:baseURLString];
    [htmlString release];
}

[connection release];

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