效果GIF.gif

之前也是使用UIWebView，但是近期使用時(shí)碰到了問題萨螺，所以就想著更換成WKWebView窄做。都知道WKWebView是在iOS8之后蘋果推出的愧驱，也有很多大牛做了他和UIWebView的對(duì)比，此處小弟就在敘述了椭盏，可以參考文章一组砚、文章二，我也是取各家之所長掏颊，以及在使用過程中遇到的問題糟红，寫下這篇文章，僅供參考乌叶！

創(chuàng)建DKSWebController繼承自UIViewController盆偿，頭文件如下：

#import <WebKit/WebKit.h>

@interface DKSWebController ()<WKNavigationDelegate, WKUIDelegate>

@property (nonatomic, strong) WKWebView *webView;

//返回按鈕
@property (nonatomic, strong) UIBarButtonItem *backItem;
//關(guān)閉按鈕
@property (nonatomic, strong) UIBarButtonItem *closeItem;

//進(jìn)度條
@property (nonatomic, strong) UIView *progressView;
@property (weak, nonatomic) CALayer *progresslayer;

@end

具體實(shí)現(xiàn)如下：代碼有點(diǎn)多，可以下載demo看看

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    
    [self addLeftButton]; //添加返回按鈕
}

#pragma mark ====== 加載HTML ======
- (void)loadHtmlStr:(NSString *)htmlStr {
    NSURL *url = [NSURL URLWithString:htmlStr];
    
    //不需要cookie的話准浴，此處只是簡單打開H5頁面
    [self.webView loadRequest:[NSURLRequest requestWithURL:url]];
}

#pragma mark ====== 加載進(jìn)度條 ======
- (void)addProgressView {
    //添加進(jìn)度條（如果沒有需要事扭，可以注釋掉）
    CGRect navigationBarBounds = self.navigationController.navigationBar.bounds;
    UIView *progress = [[UIView alloc]initWithFrame:CGRectMake(0, navigationBarBounds.size.height, CGRectGetWidth(self.view.frame), 1)];
    progress.backgroundColor = [UIColor clearColor];
    [self.navigationController.navigationBar addSubview:progress];
    
    CALayer *layer = [CALayer layer];
    layer.frame = CGRectMake(0, 0, 0, 1);
    layer.backgroundColor = [UIColor blueColor].CGColor;
    [progress.layer addSublayer:layer];
    self.progresslayer = layer;
    [self.webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil];
}

//kvo 監(jiān)聽進(jìn)度
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context {
    if ([keyPath isEqualToString:@"estimatedProgress"]) {
        self.progresslayer.opacity = 1;
        self.progresslayer.frame = CGRectMake(0, 0, self.view.bounds.size.width * [change[NSKeyValueChangeNewKey] floatValue], 1);
        if ([change[NSKeyValueChangeNewKey] floatValue] == 1) {
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
                self.progresslayer.opacity = 0;
            });
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(.8 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
                self.progresslayer.frame = CGRectMake(0, 0, 0, 1);
            });
        }
    } else {
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}

#pragma mark ====== 添加進(jìn)度條 ======
- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self addProgressView]; //添加進(jìn)度條
}

#pragma mark ====== 移除進(jìn)度條 ======
- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    //移除progressView，否則將會(huì)顯示在其他的導(dǎo)航欄上面
    [self.progressView removeFromSuperview];
}

#pragma mark ====== WKWebViewDelegate ======
// 頁面開始加載時(shí)調(diào)用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
    
}

// 當(dāng)內(nèi)容開始返回時(shí)調(diào)用
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {
    
}

// 頁面加載完成之后調(diào)用
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
    //設(shè)置webview的title
    self.title = webView.title;
}

// 頁面加載失敗時(shí)調(diào)用
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation {
    NSLog(@"網(wǎng)絡(luò)不給力");
}

// 接收到服務(wù)器跳轉(zhuǎn)請(qǐng)求之后調(diào)用
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation {
    
}

// 在收到響應(yīng)后乐横，決定是否跳轉(zhuǎn)
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {
    //允許跳轉(zhuǎn)
    decisionHandler(WKNavigationResponsePolicyAllow);
    //不允許跳轉(zhuǎn)
    //decisionHandler(WKNavigationResponsePolicyCancel);
}

// 在發(fā)送請(qǐng)求之前求橄，決定是否跳轉(zhuǎn)
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    //如果是跳轉(zhuǎn)一個(gè)新頁面
    if (navigationAction.targetFrame == nil) {
        [webView loadRequest:navigationAction.request];
    }
    
    decisionHandler(WKNavigationActionPolicyAllow);
}

#pragma mark - WKUIDelegate
// 創(chuàng)建一個(gè)新的WebView
- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures {
    return [[WKWebView alloc]init];
}

// 輸入框
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler {
    completionHandler(@"http");
}

// 確認(rèn)框
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler {
    completionHandler(YES);
}

// 警告框
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {
    completionHandler();
}

#pragma mark - 添加關(guān)閉按鈕
- (void)addLeftButton {
    self.navigationItem.leftBarButtonItem = self.backItem;
}

//點(diǎn)擊返回的方法
- (void)backNative {
    //判斷是否有上一層H5頁面
    if ([self.webView canGoBack]) {
        //如果有則返回
        [self.webView goBack];
        //同時(shí)設(shè)置返回按鈕和關(guān)閉按鈕為導(dǎo)航欄左邊的按鈕
        self.navigationItem.leftBarButtonItems = @[self.backItem, self.closeItem];
    } else {
        [self closeNative];
    }
}

//關(guān)閉H5頁面，直接回到原生頁面
- (void)closeNative {
    [self.navigationController popViewControllerAnimated:YES];
}

#pragma mark ====== init ======
- (WKWebView *)webView {
    if (!_webView) {
        _webView = [[WKWebView alloc] initWithFrame:self.view.bounds];
        _webView.navigationDelegate = self;
        _webView.UIDelegate = self;
        [self.view addSubview:_webView];
    }
    return _webView;
}

- (UIBarButtonItem *)backItem {
    if (!_backItem) {
        _backItem = [[UIBarButtonItem alloc] init];
        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
        //這是一張“<”的圖片葡公，可以讓美工給切一張
        UIImage *image = [UIImage imageNamed:@"sy_back"];
        [btn setImage:image forState:UIControlStateNormal];
        [btn setTitle:@"返回" forState:UIControlStateNormal];
        [btn addTarget:self action:@selector(backNative) forControlEvents:UIControlEventTouchUpInside];
        [btn.titleLabel setFont:[UIFont systemFontOfSize:17]];
        [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        //字體的多少為btn的大小
        [btn sizeToFit];
        //左對(duì)齊
        btn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
        //讓返回按鈕內(nèi)容繼續(xù)向左邊偏移15罐农，如果不設(shè)置的話，就會(huì)發(fā)現(xiàn)返回按鈕離屏幕的左邊的距離有點(diǎn)兒大匾南，不美觀
        btn.contentEdgeInsets = UIEdgeInsetsMake(0, -15, 0, 0);
        btn.frame = CGRectMake(0, 0, 40, 40);
        _backItem.customView = btn;
    }
    return _backItem;
}

- (UIBarButtonItem *)closeItem {
    if (!_closeItem) {
        _closeItem = [[UIBarButtonItem alloc] initWithTitle:@"關(guān)閉" style:UIBarButtonItemStylePlain target:self action:@selector(closeNative)];
        _closeItem.tintColor = [UIColor blackColor];
    }
    return _closeItem;
}

#pragma mark - 移除進(jìn)度條的監(jiān)聽
- (void)dealloc {
    [self.webView removeObserver:self forKeyPath:@"estimatedProgress"];
}

@end

以上就是WKWebView的使用方法啃匿；

如果在使用時(shí)加載不受信任的HTTPS的話，需要實(shí)現(xiàn)代理方法如下：

//此方法在iOS8上面不執(zhí)行蛆楞，也就是iOS8目前不能加載不受信任的HTTPS（我目前知道的）
- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential * _Nullable credential))completionHandler {
    if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
        NSURLCredential *card = [[NSURLCredential alloc]initWithTrust:challenge.protectionSpace.serverTrust];
        completionHandler(NSURLSessionAuthChallengeUseCredential,card);
    }
}

但是此代理方法在iOS8上面并不執(zhí)行溯乒，如果是自建證書，加載不受信任的HTTPS的話豹爹，此時(shí)在iOS8上面會(huì)顯示白屏裆悄，到目前為止并沒有找到解決方法。也有朋友提出解決方案臂聋，說使用正規(guī)的證書就行了光稼，我的內(nèi)心是抗拒的??。如果你有好的解決辦法孩等，一定要留言告知一聲艾君，萬分感謝！

加載H5時(shí)需要cookie肄方，使用AJAX進(jìn)行新的請(qǐng)求時(shí)需要cookie冰垄，也就是在跳轉(zhuǎn)新的H5時(shí)也需要cookie的話，設(shè)置方法如下：

//在開始加載webview時(shí)就不能用上面的方法了
- (void)loadHtmlStr:(NSString *)htmlStr {
    NSURL *url = [NSURL URLWithString:htmlStr];
    //如果需要設(shè)置cookie驗(yàn)證的話权她，使用此段代碼
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request addValue:[self readCurrentCookieWithDomain] forHTTPHeaderField:@"Cookie"];
    [self.webView loadRequest:request];
}

#pragma mark ====== 設(shè)置cookie ======
- (NSString *)readCurrentCookieWithDomain {
    NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    NSMutableString *cookieString = [[NSMutableString alloc] init];
    for (NSHTTPCookie *cookie in [cookieJar cookies]) {
        [cookieString appendFormat:@"%@=%@;", cookie.name, cookie.value];
    }
    
    //刪除最后一個(gè)“虹茶；”
    [cookieString deleteCharactersInRange:NSMakeRange(cookieString.length - 1, 1)];
    return cookieString;
}

// 在發(fā)送請(qǐng)求之前逝薪，決定是否跳轉(zhuǎn)并設(shè)置cookie，帶入到新的請(qǐng)求
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
     //此處是在頁面跳轉(zhuǎn)時(shí)蝴罪，防止cookie丟失做的處理
    WKNavigationActionPolicy policy = WKNavigationActionPolicyAllow;
    NSURL *url = navigationAction.request.URL;
    //此處的m.duks.com是自己公司的域名
    if ([url.host isEqualToString:@"m.duks.com"]) {
        NSDictionary *headFields = navigationAction.request.allHTTPHeaderFields;
        NSString *cookie = headFields[@"Cookie"];
        if (cookie == nil) {
            //在跳轉(zhuǎn)新的web頁面時(shí)董济，把cookie傳過去
            NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:navigationAction.request.URL];
            [request setValue:[self readCurrentCookieWithDomain] forHTTPHeaderField:@"Cookie"];
            [webView loadRequest:request];
            policy = WKNavigationActionPolicyCancel;
        }
    }
    
    //如果是跳轉(zhuǎn)一個(gè)新頁面
    if (navigationAction.targetFrame == nil) {
        [webView loadRequest:navigationAction.request];
    }
    
    decisionHandler(WKNavigationActionPolicyAllow);
}

如果是比較老的項(xiàng)目使用WKWebView，并且使用過程中用到WebViewJavascriptBridge要门，有可能會(huì)引起崩潰

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    //如果是跳轉(zhuǎn)一個(gè)新頁面
    if (navigationAction.targetFrame == nil) {
        [webView loadRequest:navigationAction.request];
    }
    //這一行崩潰
    decisionHandler(WKNavigationActionPolicyAllow);
}

此時(shí)我建議更新這個(gè)三方庫虏肾，原因是這個(gè)方法被多次調(diào)用，這個(gè)庫的作者也更新了這個(gè)問題欢搜；

最后附上Demo地址