# HybirdWKWebVIew

**Repository Path**: nehza/HybirdWKWebVIew

## Basic Information

- **Project Name**: HybirdWKWebVIew
- **Description**: 一个基于WKWebView的hybird的容器。还是通过NSURLProtocol拦截所有WKWKWebView的的css,js,png等网络请求
- **Primary Language**: Objective-C
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2020-04-03
- **Last Updated**: 2020-12-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# HybridNSURLProtocol
一个基于WKWebView的hybirde的容器。能拦截所有WKWKWebView的的css,js,png等网络请求的demo
NSURLProtocol 子类，就可以对 app 内所有的网络请求进行:

```
[NSURLProtocol registerClass:[HybridNSURLProtocol class]];

```


可是在 WKWebView 中的请求却完全不遵从这一规则，只是象征性+ (BOOL) canInitWithRequest:(NSURLRequest *)request 方法，之后的整个请求流程似乎就与 NSURLProtocol 完全无关了。

使我WKWebView 的一度认为请求不遵守NSURLProtocol协议，所以不走 NSURLProtocol。这个也是很苦扰我的问题。导致我们hybird的容器1.0也是是用UIWebVIew实现的。


但在苹果放在gittub的CustomHTTPProtocol，明显感觉到WKWebview的也是遵守NSURLProtocol，要不也不会走+ (BOOL)canInitWithRequest:(NSURLRequest *)request;后来一个每天看博客和gittub的习惯帮助了我，找到一个大神的不久前开源库。

使用了WKBrowsingContextController和registerSchemeForCustomProtocol。 通过反射的方式拿到了私有的 class/selector。通过kvc取到browsingContextController。通过把注册把 http 和 https 请求交给 NSURLProtocol 处理
```
[NSURLProtocol wk_registerScheme:@"http"];
[NSURLProtocol wk_registerScheme:@"https"];
```
下面直接上源代码吧

```
//FOUNDATION_STATIC_INLINE 属于属于runtime范畴，你的.m文件需要频繁调用一个函数,可以用static inline来声明。在SDWebImage读取内存的缓存也用到这个声明。
FOUNDATION_STATIC_INLINE Class ContextControllerClass() {
static Class cls;
if (!cls) {
cls = [[[WKWebView new] valueForKey:@"browsingContextController"] class];
}
return cls;
}

FOUNDATION_STATIC_INLINE SEL RegisterSchemeSelector() {
return NSSelectorFromString(@"registerSchemeForCustomProtocol:");
}

FOUNDATION_STATIC_INLINE SEL UnregisterSchemeSelector() {
return NSSelectorFromString(@"unregisterSchemeForCustomProtocol:");
}

@implementation NSURLProtocol (WebKitSupport)

+ (void)wk_registerScheme:(NSString *)scheme {
Class cls = ContextControllerClass();
SEL sel = RegisterSchemeSelector();
if ([(id)cls respondsToSelector:sel]) {
// 放弃编辑器警告
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
[(id)cls performSelector:sel withObject:scheme];
#pragma clang diagnostic pop
}
}

+ (void)wk_unregisterScheme:(NSString *)scheme {
Class cls = ContextControllerClass();
SEL sel = UnregisterSchemeSelector();
if ([(id)cls respondsToSelector:sel]) {
// 放弃编辑器警告
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
[(id)cls performSelector:sel withObject:scheme];
#pragma clang diagnostic pop
}
}

```
注册后，客户端所有请求走+ (BOOL)canInitWithRequest:(NSURLRequest *)request。下面是打印的请求的log

```
+ (BOOL)canInitWithRequest:(NSURLRequest *)request
{
NSLog(@"request.URL.absoluteString = %@",request.URL.absoluteString);
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:KHybridNSURLProtocolHKey inRequest:request])
return NO;
return YES;
}
return NO;
}

```

![Aaron Swartz](https://github.com/LiuShuoyu/HybirdWKWebVIew/blob/master/jpeg/WechatLog.jpeg?raw=true)

request的重写定向，request的重写定向，替换百度知道的log
```
+ (BOOL)canInitWithRequest:(NSURLRequest *)request
{
NSLog(@"request.URL.absoluteString = %@",request.URL.absoluteString);
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:KHybridNSURLProtocolHKey inRequest:request])
return NO;
return YES;
}
return NO;
}

```
这里最好加上缓存判断，加载本地离线文件， 这个直接简单的例子。
``` 
- (void)startLoading
{
NSMutableURLRequest *mutableReqeust = [[self request] mutableCopy];
//给我们处理过的请求设置一个标识符, 防止无限循环,
[NSURLProtocol setProperty:@YES forKey:KHybridNSURLProtocolHKey inRequest:mutableReqeust];

//这里最好加上缓存判断，加载本地离线文件， 这个直接简单的例子。
if ([mutableReqeust.URL.absoluteString isEqualToString:sourIconUrl])
{
NSData* data = UIImagePNGRepresentation([UIImage imageNamed:@"medlinker"]);
NSURLResponse* response = [[NSURLResponse alloc] initWithURL:self.request.URL MIMEType:@"image/png" expectedContentLength:data.length textEncodingName:nil];
[self.client URLProtocol:self didReceiveResponse:response cacheStoragePolicy:NSURLCacheStorageAllowed];
[self.client URLProtocol:self didLoadData:data];
[self.client URLProtocolDidFinishLoading:self];
}
else
{
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:nil];
self.task = [session dataTaskWithRequest:self.request];
[self.task resume];
}
}

```
下面是代码效果图

![Aaron Swartz](https://github.com/LiuShuoyu/HybirdWKWebVIew/blob/master/jpeg/WechatIMG1.jpeg)
![Aaron Swartz](https://github.com/LiuShuoyu/HybirdWKWebVIew/blob/master/jpeg/WechatIMG2.jpeg)


##有问题反馈
在使用中有任何问题，欢迎反馈给我，可以用以下联系方式跟我交流

* QQ 微信 476804765
* Email:13281250969@163.com


###接受启发的作者的github
github：<a href="https://github.com/yeatse/">Yeatse CC</a>
苹果开发者文档：<a href="https://developer.apple.com/library/content/samplecode/CustomHTTPProtocol/Introduction/Intro.html/">apple</a>