簡介：
就不復(fù)述官方對WKWebView的描述了荣病，隨便搜一下就有一大推栋操。簡單的說，WKWebView是iOS8之后推出的饱亮，與UIWebView作用相同矾芙，但是在加載速度、內(nèi)存占用等方面都有顯著提升近上。
常用的協(xié)議方法：
- 開始加載網(wǎng)頁的時候調(diào)用剔宪。
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
}
- 服務(wù)器收到請求后，返回網(wǎng)頁內(nèi)容戈锻。
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {
}
- 頁面加載完成歼跟，可以在該方法中通過webView.title設(shè)置導(dǎo)航條標(biāo)題。
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
}
- 頁面加載發(fā)生錯誤格遭，可以獲取錯誤信息哈街，重新加載網(wǎng)頁[webView reload]
- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error {
}
- 頁面加載失敗
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error {
}
上面這幾個方法都不是我在做免登陸時用到的主要方法，哈哈哈拒迅！
進入正題骚秦，網(wǎng)頁中的免登陸（有點瑕疵）
需求：加載某個網(wǎng)頁（例：簡書），第一次加載需要登陸璧微，退出網(wǎng)頁后下次加載時避免二次登陸作箍。
- 第一步
在創(chuàng)建WKWebView對象時，選擇自定義配置加載網(wǎng)頁時攜帶的cookie等（WKWebViewConfiguration）前硫。如果本地存在上次登陸保留的cookie胞得，那么直接將cookie配置到webView中，可以在加載后面的頁面時自動攜帶cookie屹电。如果本地沒有阶剑，不好意思，登陸吧危号。
- (WKWebView *)webView {
if (!_webView) {
WKUserContentController* userContentController = [[WKUserContentController alloc] init];
WKWebViewConfiguration* config = [[WKWebViewConfiguration alloc] init];
config.userContentController = userContentController;
WKProcessPool *processPool = [[WKProcessPool alloc] init];
config.processPool = processPool;
WKUserScript * cookieScript = [[WKUserScript alloc] initWithSource:[self cookieJavaScriptString] injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
[userContentController addUserScript:cookieScript];
_webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:config];
_webView.UIDelegate = self;
_webView.navigationDelegate = self;
}
return _webView;
}
- 第二步
獲取本地cookie牧愁，cookie的本地持久化我是用網(wǎng)頁的host作為鍵值的，保證需要同一個cookie的網(wǎng)頁通過host獲取對應(yīng)cookie外莲。注意從本地取出的不是cookie對象猪半，而是取出它的內(nèi)容，然后創(chuàng)建的cookie對象（直接本地存儲cookie做不到）偷线。這里NSHTTPCookieStorage我就不介紹了磨确。
//配置config，獲取cookieString
- (NSString *)cookieJavaScriptString {
NSMutableString *cookieString = [[NSMutableString alloc] init];
NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
NSDictionary *cookieDic = [userDefault objectForKey:self.urlHost];
for (NSString *key in cookieDic) {
NSHTTPCookie *cookie = [[NSHTTPCookie alloc] initWithProperties:[cookieDic objectForKey:key]];
NSString *excuteJSString = [NSString stringWithFormat:@"document.cookie='%@=%@';", cookie.name, cookie.value];
[cookieString appendString:excuteJSString];
}
//執(zhí)行js
return cookieString;
}
- 第三步
進行網(wǎng)頁的跳轉(zhuǎn)淋昭，在向服務(wù)器發(fā)送請求之前先判斷請求是否攜帶了cookie（雖然第一步配置了cookie俐填，以防萬一還是要判斷一下的），如果未攜帶cookie翔忽，取消跳轉(zhuǎn)英融，手動添加cookie后跳轉(zhuǎn)盏檐。
//發(fā)送請求之前，決定是否跳轉(zhuǎn)
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
self.urlHost = navigationAction.request.URL.host;
//判斷是否存host
if (self.urlHost) {
if (!navigationAction.request.allHTTPHeaderFields[@"Cookie"]) {
decisionHandler(WKNavigationActionPolicyCancel);
[self loadRequestWithString:navigationAction.request.URL];
}else {
decisionHandler(WKNavigationActionPolicyAllow);
}
}else {
decisionHandler(WKNavigationActionPolicyAllow);
}
}
//手動添加cookie
- (void)loadRequestWithString:(NSURL *)url {
NSMutableString *cookieValue = [NSMutableString string];
NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];
NSDictionary *cookieDic = nil;
if (self.urlHost) {
cookieDic = [userDefault objectForKey:self.urlHost];
}
for (NSString *key in cookieDic) {
NSHTTPCookie *cookie = [[NSHTTPCookie alloc] initWithProperties:[cookieDic objectForKey:key]];
NSString *appendString = [NSString stringWithFormat:@"%@=%@;", cookie.name, cookie.value];
[cookieValue appendString:appendString];
}
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request addValue:cookieValue forHTTPHeaderField:@"Cookie"];
[self.webView loadRequest:request];
}
- 第四步
保存cookie驶悟，第一次進入或cookie失效都是需要登錄的胡野，登錄成功后我們就要將網(wǎng)頁請求的cookie保存到本地，下次加載時直接拿出來用痕鳍。
//接收到響應(yīng)后硫豆，決定是否跳轉(zhuǎn)
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {
//將獲取的cookie本地化
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSMutableDictionary *cookieDic = [[NSMutableDictionary alloc] initWithDictionary:[userDefaults objectForKey:self.urlHost]];
NSHTTPURLResponse *response = (NSHTTPURLResponse *)navigationResponse.response;
NSArray *cookies = [NSHTTPCookie cookiesWithResponseHeaderFields:[response allHeaderFields] forURL:response.URL];
for (NSHTTPCookie *cookie in cookies) {
[cookieDic setObject:[cookie properties] forKey:cookie.name];
}
[userDefaults setObject:cookieDic forKey:self.urlHost];
decisionHandler(WKNavigationActionPolicyAllow);
}
