导语:
最近,webAPP比较火,公司也在用JS框架开发移动APP,web前端的同事负责用JS开发内容,负责iOS的我 和 负责Android的同事,就简单的搭建一个架子.
但是,我在开发中就遇到一些问题,比如本篇文章要讲的webView获取网络请求返回的Session,开始我也是一头雾水,经过一番折腾,到百度,Google.还是找到了解决的办法.
第一步:创建一个继承NSURLProtocol的类
在.m文件中声明NSURLConnection的属性,而且遵守NSURLConnectionDelegate,代码如下:
#import "CustomURLProtocol.h"
static NSString * const URLProtocolHandledKey = @"URLProtocolHandledKey";
@interface CustomURLProtocol ()<NSURLConnectionDelegate>
@property (nonatomic, strong) NSURLConnection *connection
@end
- NSURLConnection: 提供支持执行异步加载URL请求，向数据库提供数据客户提供的代理(英语不好,找Google翻译的)
第二步: 去重写NSURLProtocol的方法
代码如下:
//This method determines whether this protocol can handle the given request.
+ (BOOL)canInitWithRequest:(NSURLRequest *)request
{
//只处理http和https请求
NSString *scheme = [[request URL] scheme];
if ( ([scheme caseInsensitiveCompare:@"http"] == NSOrderedSame ||
[scheme caseInsensitiveCompare:@"https"] == NSOrderedSame)) {
//看看是否已经处理过了，防止无限循环
if ([NSURLProtocol propertyForKey:URLProtocolHandledKey inRequest:request]) {
return NO;
}
Log(@"relativePath -- %@",request.URL.relativePath);
// 可以做一些网络请求的需要的事情(如:带cookie等等)
return YES;
}
//This method returns a canonical version of the given request.
+ (NSURLRequest *) canonicalRequestForRequest:(NSURLRequest *)request {
return request;
}
//Compares two requests for equivalence with regard to caching.
+ (BOOL)requestIsCacheEquivalent:(NSURLRequest *)a toRequest:(NSURLRequest *)b
{
return [super requestIsCacheEquivalent:a toRequest:b];
}
//Starts protocol-specific loading of a request.
- (void)startLoading
{
NSMutableURLRequest *mutableReqeust = [[self request] mutableCopy];
//打标签，防止无限循环
[NSURLProtocol setProperty:@YES forKey:URLProtocolHandledKey inRequest:mutableReqeust];
self.connection = [NSURLConnection connectionWithRequest:mutableReqeust delegate:self];
}
//tops protocol-specific loading of a request.
- (void)stopLoading
{
[self.connection cancel];
}
第三步: 实现NSURLConnectionDelegate
的方法代码如下:
#pragma mark - NSURLConnectionDelegate
/// 网络请求返回数据
- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
NSHTTPURLResponse *httpresponse = (NSHTTPURLResponse *)response;
if([httpresponse respondsToSelector:@selector(allHeaderFields)]){
NSDictionary *di = [httpresponse allHeaderFields];
NSArray *keys = [di allKeys];
for(int i=0; i<di.count;i++){
NSString *key = [keys objectAtIndex:i];
NSString *value=[di objectForKey:key];
if([key rangeOfString:@"Set-Cookie"].location != NSNotFound)
{
Log(@"response_header_value -- %@",value);
// 获取Session
}
}
}
[self.client URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageNotAllowed];
}
- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[self.client URLProtocol:self didLoadData:data];
}
- (void) connectionDidFinishLoading:(NSURLConnection *)connection {
[self.client URLProtocolDidFinishLoading:self];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
[self.client URLProtocol:self didFailWithError:error];
}
第四步:在AppDelegate.m中注册
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
//注册protocol
[NSURLProtocol registerClass:[CustomURLProtocol class]];
return YES;
}
结语:
也是第一次了解这方面的知识,对你有帮助就帮忙点个赞,有错误的地方望大家指出来,谢谢😁😁
