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https://github.com/wu736139669/ASHWebURLProtocol.git
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81 lines
2.4 KiB
Markdown
81 lines
2.4 KiB
Markdown
# ASHWebURLProtocol
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iOS WebView缓存
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###首先继承 <font color=green>`NSURLProtocol`</font>
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```
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+(BOOL)canInitWithRequest:(NSURLRequest *)request
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{
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///通过UA 来判断是否UIWebView发起的请求
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NSString* UA = [request valueForHTTPHeaderField:@"User-Agent"];
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if ([UA containsString:@" AppleWebKit/"] == NO) {
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return NO;
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}
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if ([request valueForHTTPHeaderField:kHTTPHeaderField]) {
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return NO;
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}
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return YES;
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}
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```
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<font color=green>`NSString* UA = [request valueForHTTPHeaderField:@"User-Agent"];`</font>
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中可以判断是否是`WebView`发出的请求。
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当判断是`WebView`的时候才进行处理。
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```
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- (void)startLoading
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{
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NSString *cachesPath = [self cachePathForRequest:[self request]];
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ASHCachedData *cache = [NSKeyedUnarchiver unarchiveObjectWithFile:cachesPath];
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//使用缓存。
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if (cache) {
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NSData *data = cache.data;
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[[self client] URLProtocol:self didReceiveResponse:cache.response cacheStoragePolicy:NSURLCacheStorageNotAllowed];
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[[self client] URLProtocol:self didLoadData:data];
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[[self client] URLProtocolDidFinishLoading:self];
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// return;
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}
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//重新请求。
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NSMutableURLRequest *newRequest = [self.request mutableCopy];
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[newRequest setValue:@"" forHTTPHeaderField:kHTTPHeaderField];
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[newRequest setCachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData];
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self.connection = [NSURLConnection connectionWithRequest:newRequest
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delegate:self];
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}
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```
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###上面是主要的代码，<font color=green>先使用了缓存，然后再去重新请求，这样就会刷新请求数据</font>.
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```
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- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
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[self.client URLProtocolDidFinishLoading:self];
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NSString *cachesPath = [self cachePathForRequest:[self request]];
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ASHCachedData *cache = [ASHCachedData new];
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cache.data = [self data];
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cache.response = [self response];
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[NSKeyedArchiver archiveRootObject:cache toFile:cachesPath];
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}
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```
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###
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最后一段就是对内容进行保存，当然也可以根据后缀把图片单独用`SDWebImage`保存，可以和原生代码里面的图片共用缓存。
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###最后还需要注册一下 在 <font color=green>`AppDelegate`</font> 中
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```
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[NSURLProtocol registerClass:[ASHWebNSURLProtocol class]];
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``` |