贴上代码：

#import "MJWebVC.h"//Libs
#import <WebKit/WebKit.h>@interface MJWebVC ()<WKNavigationDelegate, WKUIDelegate>@property(nonatomic, strong) WKWebView *webView;
@property(nonatomic, strong) UIProgressView *progress;@end@implementation MJWebVC- (void)viewDidLoad {[super viewDidLoad];NSString *url = [NSString stringWithFormat:@"%@?accessToken=%@", self.urlStr, kRT];[self loadRequestWithUrlString:url];//TODO:kvo监听，获得页面title和加载进度值[self.webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:NULL];[self.webView addObserver:self forKeyPath:@"title" options:NSKeyValueObservingOptionNew context:NULL];[self.view addSubview:self.webView];[self.view addSubview:self.progress];
}- (void)loadRequestWithUrlString:(NSString *)urlString {// 在此处获取返回的cookieNSMutableDictionary *cookieDic = [NSMutableDictionary dictionary];NSMutableString *cookieValue = [NSMutableString stringWithFormat:@""];NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];for (NSHTTPCookie *cookie in [cookieJar cookies]) {[cookieDic setObject:cookie.value forKey:cookie.name];}// cookie重复，先放到字典进行去重，再进行拼接for (NSString *key in cookieDic) {NSString *appendString = [NSString stringWithFormat:@"%@=%@;", key, [cookieDic valueForKey:key]];[cookieValue appendString:appendString];}NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]];[request addValue:cookieValue forHTTPHeaderField:@"Cookie"];[self.webView loadRequest:request];
}#pragma mark - *************** 监听- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {//加载进度值if ([keyPath isEqualToString:@"estimatedProgress"]) {if (object == self.webView) {[self.progress setAlpha:1.0f];[self.progress setProgress:self.webView.estimatedProgress animated:YES];if(self.webView.estimatedProgress >= 1.0f) {[UIView animateWithDuration:0.5f delay:0.3f options:UIViewAnimationOptionCurveEaseOut animations:^{[self.progress setAlpha:0.0f];} completion:^(BOOL finished) {[self.progress setProgress:0.0f animated:NO];}];}} else {[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];}} else if ([keyPath isEqualToString:@"title"]) {//网页titleif (object == self.webView) {self.navigationItem.title = self.webView.title;} else {[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];}} else {[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];}
}#pragma mark - *************** 销毁的时候，一定要移除监听- (void)dealloc {[self.webView removeObserver:self forKeyPath:@"estimatedProgress"];[self.webView removeObserver:self forKeyPath:@"title"];}#pragma mark - *************** WKNavigationDelegate代理- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {}- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation {}// 页面开始加载时调用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {}// 当内容开始返回时调用
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {}- (void)webView:(WKWebView *)webView didFailNavigation:(WKNavigation *)navigation withError:(NSError *)error {}- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error {}#pragma mark - *************** lazy load- (WKWebView *)webView {if (!_webView) {_webView = [[WKWebView alloc] initWithFrame:self.view.bounds];_webView.navigationDelegate = self;_webView.UIDelegate = self;}return _webView;
}- (UIProgressView *)progress {if (!_progress) {_progress = [[UIProgressView alloc]initWithFrame:CGRectMake(0, 64, MJScreenWidth, 2)];_progress.tintColor = [UIColor blueColor];_progress.backgroundColor = [UIColor lightGrayColor];}return _progress;
}@end
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另外附上其他需要cookie请求的代码：

AFNetworking：

// 获取AFHTTPRequestOperationManagerAFHTTPRequestOperationManager *operationManager = [AFHTTPRequestOperationManager manager];// 创建可变字典用于存放CookieNSMutableDictionary *cookieDic = [NSMutableDictionary dictionary];// 存放新添加的cookie#warning 单个的Cookie还好，但是楼主在工厂类方法中拼接了一个包含6个设备信息的value值，最后忘记加分号了，测试也没测出来#warning 因为不影响功能，但是后面的cookie就自动拼接上了，H5那边也识别不到，险造成重大事故(涉及金融。。)，望后来者看到，提前做好准备(就凭这个坑，你得给我个赞)NSMutableString *cookieValue = [NSMutableString stringWithFormat:@"fromapp=ios;"];// 获取NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];for (NSHTTPCookie *cookie in [cookieJar cookies]) {[cookieDic setObject:cookie.value forKey:cookie.name];}// cookie重复，先放到字典去重，再进行拼接for (NSString *key in cookieDic) {NSString *appendString = [NSString stringWithFormat:@"%@=%@;", key, [cookieDic valueForKey:key]];[cookieValue appendString:appendString];}// 将cookie存到请求头中[operationManager.requestSerializer setValue:cookieValue forHTTPHeaderField:@"Cookie"];//  拼接url地址NSString *urlStr = [NSString stringWithFormat:@"%@%@", kHostIP, kPath];// 设置参数字典NSDictionary *paraDict = @{@"key" : value};// 发送请求，处理结果[operationManager POST:urlStr parameters:paraDict success:^(AFHTTPRequestOperation * _Nonnull operation, id  _Nonnull responseObject) {NSLog(@"responseObject-->%@", responseObject);} failure:^(AFHTTPRequestOperation * _Nullable operation, NSError * _Nonnull error) {NSLog(@"error-->%@", error);}];
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WKWebView：

如果WKWebView在加载url的时候需要添加cookie，需要先手动获取当前NSHTTPCookieStorage中的所有cookie，然后将cookie放到NSMutableURLRequest请求头中

- (void)loadRequestWithUrlString:(NSString *)urlString {// 在此处获取返回的cookieNSMutableDictionary *cookieDic = [NSMutableDictionary dictionary];NSMutableString *cookieValue = [NSMutableString stringWithFormat:@""];NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];for (NSHTTPCookie *cookie in [cookieJar cookies]) {[cookieDic setObject:cookie.value forKey:cookie.name];}// cookie重复，先放到字典进行去重，再进行拼接for (NSString *key in cookieDic) {NSString *appendString = [NSString stringWithFormat:@"%@=%@;", key, [cookieDic valueForKey:key]];[cookieValue appendString:appendString];}NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]];[request addValue:cookieValue forHTTPHeaderField:@"Cookie"];[self loadRequest:request];
}
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UIWebView：

// 工厂类中存储cookie的方法
+ (void)saveCookies {// 创建一个可变字典存放cookieNSMutableDictionary *fromappDict = [NSMutableDictionary dictionary];[fromappDict setObject:@"fromapp" forKey:NSHTTPCookieName];[fromappDict setObject:@"ios" forKey:NSHTTPCookieValue];// kDomain是公司app网址[fromappDict setObject:kDomain forKey:NSHTTPCookieDomain];[fromappDict setObject:kDomain forKey:NSHTTPCookieOriginURL];[fromappDict setObject:@"/" forKey:NSHTTPCookiePath];[fromappDict setObject:@"0" forKey:NSHTTPCookieVersion];// 将可变字典转化为cookieNSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:fromappDict];// 获取cookieStorageNSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage]// 存储cookie[cookieStorage setCookie:cookie];
}
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注意：

• UIWebView使用时间较长，只要在cookieStorage中设置了相应的cookie，每次就会自动带上；
• 但是这样的弊端是随着与H5的交互增加，Cookie占用的空间越来越大，每次交互都夹带大量的cookie，不仅增加服务器端压力，也浪费用户的流量。比如每次交互都夹带5kb的cookie内容，但是真正用到的只有两三百字节。

后记：吃水不忘挖井人，感谢si1ence提供的帮助！