WKWebView

WKWebView

-(WKWebView *)kWebView
{
    if (_kWebView == nil) {
        WKWebViewConfiguration *confige = [WKWebViewConfiguration new];
        confige.suppressesIncrementalRendering = YES;  //决定webview是否等所有数据加载完成之后再渲染视图默认为no，
        confige.processPool = [WKProcessPool new]; //进程池
        confige.preferences = [WKPreferences new]; //偏好设置，主要设置字体大小，JavaScript支持等
        confige.applicationNameForUserAgent = @"设置user-Agent中的应用名字";
        confige.allowsAirPlayForMediaPlayback = YES;//允许远程播放媒体 默认允许
        confige.mediaTypesRequiringUserActionForPlayback = WKAudiovisualMediaTypeNone;//设置那种媒体需要用户操作才能播放，设置none的时候所有媒体都需要用户操作才能播放
        confige.allowsInlineMediaPlayback = NO;//是否允许小窗口播放，为no是全屏播放video，iphone默认为no，ipad默认为yes
        confige.selectionGranularity = WKSelectionGranularityDynamic; //用户选择内容的间隔，默认是动态的
        confige.allowsPictureInPictureMediaPlayback = YES;//是否允许画中画，默认允许
        confige.dataDetectorTypes = UIDataDetectorTypeLink;//检测类型，数字、链接等
        confige.ignoresViewportScaleLimits = YES;//是否忽略视图scale限制，默认为no
        _kWebView = [[WKWebView alloc]initWithFrame:CGRectMake(0, 66, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height-66) configuration:confige];
        _kWebView.navigationDelegate = self;
        _kWebView.UIDelegate = self;
    }
    return _kWebView;
}

需要导入框架

import

通过懒加载创建WKWebview对象。

WKWebView代理方法

理解wkwebview的代理方法可以的调用很像http请求的三次握手
(理解http网络访问的三次握手，可以模仿两个人的对话，第一次握手:你给别人说话，别人听到了。第二次握手，别人告诉你说，我听到了，第三次握手：你告诉别人说你听到了。)

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
  //是否允许wkwebview中加载带有事件的网页，比如，action事件，submitt事件
    decisionHandler(WKNavigationActionPolicyAllow);
    NSLog(@"decidePolicyForNavigationAction");
}
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation
{
  //开始加载网页调用方法
    NSLog(@"didStartProvisionalNavigation");
}
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler
{
    //是否允许加载网页相当于webview中的shouldLoadWebview方法
    decisionHandler(WKNavigationResponsePolicyAllow);
    NSLog(@"decidePolicyForNavigationResponse");
}
- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation
{

    NSLog(@"didCommitNavigation");
}
- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation
{

    NSLog(@"didFinishNavigation");
}

- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation
{
        NSLog(@"didReceiveServerRedirectForProvisionalNavigation");
}
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error
{
    NSLog(@"didFailProvisionalNavigation");
}

- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error
{
    NSLog(@"didFailNavigation");
}

代理方法的执行顺序是从上往下执行的。
wkwebview中的好多属性都是写明了
@discussion @link WKWebView @/link is key-value observing (KVO) compliant
for this property.
意思就是这个属性可以用键值观察，做某些操作，比如estimatedProgress属性标识网页的加载进度，WKWebivew利用WKNavigation的对象来表示网页加载的整个流程,但是这个类的对象官方并没有给出任何相关的属性和方法。
因此上想要监测网页的加载进入只能 利用WKwebview的estimatedProgress属性。

给wkwebview设置cookie的正确姿势

NSMutableDictionary *cookieProperties = [NSMutableDictionary dictionary];
[cookieProperties setObject:[[NSURL URLWithString:JiFenMerchant_URL] host] forKey:NSHTTPCookieDomain];
[cookieProperties setObject:@"token" forKey:NSHTTPCookieName];
[cookieProperties setObject:@"ohayao" forKey:NSHTTPCookieValue];
[cookieProperties setObject:[NSURL URLWithString:JiFenMerchant_URL] forKey:NSHTTPCookieOriginURL];
[cookieProperties setObject:@"/" forKey:NSHTTPCookiePath]; //尤其要注意路径
[cookieProperties setObject:[NSDate dateWithTimeIntervalSinceNow:60*60*24*7] forKey:NSHTTPCookieExpires];//设置失效时间
NSHTTPCookie *cookies = [NSHTTPCookie cookieWithProperties:cookieProperties];

WKWebViewConfiguration *webViewConfig = [WKWebViewConfiguration new];
WKWebsiteDataStore *store = [WKWebsiteDataStore defaultDataStore];
if (@available(iOS 11.0, *)) {
   [store.httpCookieStore setCookie:cookies completionHandler:^{

   }];
} else {
   // Fallback on earlier versions
}
webViewConfig.websiteDataStore = store;

关于wkwebview加载H5的问题

1. 点击H5中的按钮到下级页面，点击原生的返回按钮调用wkwebview的goback方法返回到一级页面navigationtitle不改变的问题。
   可以用kvo检测title的变化，实现动态改变代码如下

   [self.wkWebView addObserver:self forKeyPath:@"title" options:NSKeyValueObservingOptionNew context:NULL];
   代理防范
   #pragma mark KVO的监听代理
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if (self.changeTitleBool) {
        //网页title
        if ([keyPath isEqualToString:@"title"])
        {
            if (object == self.wkWebView)
            {
                self.title = self.wkWebView.title;
            }
            else
            {
                [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
            }
        }
        else
        {
            [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
        }
    }
}

给webview添加cookies实现

特别注意调用顺序

//设置cookie
    NSString *tokenCookie = (NSString*)[HMFileManager getObjectByFileName:@"tokenCookie"];
    NSMutableDictionary *cookieProperties = [NSMutableDictionary dictionary];
    [cookieProperties setObject:[[NSURL URLWithString:self.urlString] host] forKey:NSHTTPCookieDomain];
    [cookieProperties setObject:@"token" forKey:NSHTTPCookieName];
    [cookieProperties setObject:tokenCookie forKey:NSHTTPCookieValue];
    [cookieProperties setObject:[NSURL URLWithString:self.urlString] forKey:NSHTTPCookieOriginURL];
    [cookieProperties setObject:@"/" forKey:NSHTTPCookiePath];
    [cookieProperties setObject:[NSDate dateWithTimeIntervalSinceNow:60*60*24*7] forKey:NSHTTPCookieExpires];//设置失效时间
    NSHTTPCookie *cookie = [[NSHTTPCookie alloc]initWithProperties:cookieProperties];
    [NSHTTPCookieStorage sharedHTTPCookieStorage].cookieAcceptPolicy = NSHTTPCookieAcceptPolicyAlways;
    NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    [cookieStorage setCookies:@[cookie] forURL:[NSURL URLWithString:self.urlString] mainDocumentURL:[NSURL URLWithString:self.urlString]];
    //创建请求
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:self.urlString]];
    //设置应用标示到header
    NSString *appInfo =  @"CarCar/iOS";
    [request setValue:appInfo forHTTPHeaderField:@"AppInfo"];