一篇文章搞定WKWebView（iOS 8之后最優(yōu)Web解決框架）

iOS8以后核畴，蘋果推出了新框架Webkit含蓉，提供了替換UIWebView的組件WKWebView。其優(yōu)點(diǎn)速度更快项郊，占用內(nèi)存更少馅扣，簡(jiǎn)而言之，WKWebView是App內(nèi)部加載網(wǎng)頁(yè)的最佳選擇着降。

WKNavigationDelegate代理方法

#pragma mark -----WKNavigationDelegate---------
// 頁(yè)面開始加載時(shí)調(diào)用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
    NSLog(@"頁(yè)面開始加載時(shí)調(diào)用");
}

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

// 頁(yè)面加載完成之后調(diào)用
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
    NSLog(@"頁(yè)面加載完成之后調(diào)用");
}

// 頁(yè)面加載失敗時(shí)調(diào)用
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation {
    NSLog(@"頁(yè)面加載失敗時(shí)調(diào)用");
}

// 頁(yè)面導(dǎo)航錯(cuò)誤時(shí)調(diào)用
- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(nonnull NSError *)error {
    NSLog(@"頁(yè)面導(dǎo)航錯(cuò)誤時(shí)調(diào)用");
}

//頁(yè)面終結(jié)時(shí)調(diào)用
- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView {
    
    NSLog(@"頁(yè)面終結(jié)時(shí)調(diào)用");
}

// 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 {
    
    NSLog(@"接收到服務(wù)器跳轉(zhuǎn)請(qǐng)求之后調(diào)用");
}

// 在收到響應(yīng)后差油，決定是否跳轉(zhuǎn)
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {
    
    NSLog(@"在收到響應(yīng)后，決定是否跳轉(zhuǎn)");
    decisionHandler(WKNavigationResponsePolicyAllow);
}

// 在發(fā)送請(qǐng)求之前任洞，決定是否跳轉(zhuǎn)
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    
    NSLog(@"在發(fā)送請(qǐng)求之前蓄喇，決定是否跳轉(zhuǎn)");
    decisionHandler(WKNavigationActionPolicyAllow);
}

//證書驗(yàn)證處理
- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(nonnull void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler {

    NSLog(@"證書驗(yàn)證處理");
    // 判斷服務(wù)器采用的驗(yàn)證方法
    if (challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust) {
        // 如果沒有錯(cuò)誤的情況下 創(chuàng)建一個(gè)憑證，并使用證書
        if (challenge.previousFailureCount == 0) {
            NSURLCredential *credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
            completionHandler(NSURLSessionAuthChallengeUseCredential, credential);
        }else {
             //驗(yàn)證失敗交掏，取消本次驗(yàn)證
            completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, nil);
        }
    }else {
        completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, nil);
        
    }
}

WKUIDelegate代理方法

#pragma mark ----WKUIDelegate協(xié)議----

/**
 *  web界面中有彈出警告框時(shí)調(diào)用
 *
 *  @param webView           實(shí)現(xiàn)該代理的webview
 *  @param message           警告框中的內(nèi)容
 *  @param frame             主窗口
 *  @param completionHandler 警告框消失調(diào)用
 */
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(nonnull WKFrameInfo *)frame completionHandler:(nonnull void (^)(void))completionHandler {
    // js 里面的alert實(shí)現(xiàn)妆偏，如果不實(shí)現(xiàn)，網(wǎng)頁(yè)的alert函數(shù)無效
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示"
                                                                             message:message
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"確定"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler();
                                                      }]];
    
    [self presentViewController:alertController animated:YES completion:^{}];
    
}


/**
 web界面中有彈出選擇框

 @param webView 實(shí)現(xiàn)該代理的webview
 @param message 警告框中的內(nèi)容
 @param frame 主窗口
 @param completionHandler 警告框消失調(diào)用 得到選擇結(jié)果
 */
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler {
    //  js 里面的alert實(shí)現(xiàn)盅弛，如果不實(shí)現(xiàn)钱骂，網(wǎng)頁(yè)的alert函數(shù)無效  ,
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示"
                                                                             message:message
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"確定"
                                                        style:UIAlertActionStyleDefault
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler(YES);
                                                      }]];
    [alertController addAction:[UIAlertAction actionWithTitle:@"取消"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action){
                                                          completionHandler(NO);
                                                      }]];
    
    [self presentViewController:alertController animated:YES completion:^{}];
    
}


/**
 web界面中有彈出輸入框

 @param webView 實(shí)現(xiàn)該代理的webview
 @param prompt 輸入框的提示內(nèi)容
 @param defaultText 默認(rèn)的填寫內(nèi)容
 @param frame 主窗口
 @param completionHandler 警告框消失調(diào)用 得到輸入內(nèi)容
 */
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(nonnull WKFrameInfo *)frame completionHandler:(nonnull void (^)(NSString * _Nullable))completionHandler {
    
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:prompt message:nil preferredStyle:UIAlertControllerStyleAlert];
    
    [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.textColor = [UIColor blackColor];
        textField.text = defaultText;
    }];
    
    [alert addAction:[UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        completionHandler([[alert.textFields lastObject] text]);
    }]];
    
    [self presentViewController:alert animated:YES completion:NULL];
}

添加進(jìn)度條UIProgressView

需要通過KVO監(jiān)聽進(jìn)行實(shí)現(xiàn)，初始化頁(yè)面時(shí)添加監(jiān)聽事件

//初始化頁(yè)面時(shí)添加監(jiān)聽事件
[_webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil];
[_webView addObserver:self forKeyPath:@"loading" options:NSKeyValueObservingOptionNew context:nil];
[_webView addObserver:self forKeyPath:@"title" options:NSKeyValueObservingOptionNew context:nil];

// 計(jì)算wkWebView進(jìn)度條
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    
    if ([keyPath isEqualToString:@"estimatedProgress"]) {
        NSLog(@"estimatedProgress");
        CGFloat newprogress = [[change objectForKey:NSKeyValueChangeNewKey] doubleValue];
        if (newprogress == 1) {
            self.progressView.hidden = YES;
            [self.progressView setProgress:0 animated:NO];
        }else {
            self.progressView.hidden = NO;
            [self.progressView setProgress:newprogress animated:YES];
        }
    }else if ([keyPath isEqualToString:@"title"]) {
        NSLog(@"title");
        self.title = self.webView.title;
    }else if ([keyPath isEqualToString:@"loading"]) {
        
        NSLog(@"loading");
    }
}

頁(yè)面代碼示例下載Demo

#import <WebViewController.h>
#import <WebKit/WebKit.h>

@interface WebViewController ()<WKNavigationDelegate, WKUIDelegate>

@property (nonatomic, strong) WKWebView *webView;
@property (strong, nonatomic) UIProgressView *progressView;

@end

@implementation WebViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:self.requestUrlStr]]];
    // Do any additional setup after loading the view.
}

#pragma mark -----WKNavigationDelegate---------
// 頁(yè)面開始加載時(shí)調(diào)用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
    NSLog(@"頁(yè)面開始加載時(shí)調(diào)用");
}
// 當(dāng)內(nèi)容開始返回時(shí)調(diào)用
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {
    NSLog(@"當(dāng)內(nèi)容開始返回時(shí)調(diào)用");
}
// 頁(yè)面加載完成之后調(diào)用
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
    NSLog(@"頁(yè)面加載完成之后調(diào)用");
}
// 頁(yè)面加載失敗時(shí)調(diào)用
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation {
    NSLog(@"頁(yè)面加載失敗時(shí)調(diào)用");
}
// 頁(yè)面導(dǎo)航錯(cuò)誤時(shí)調(diào)用
- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(nonnull NSError *)error {
    NSLog(@"頁(yè)面導(dǎo)航錯(cuò)誤時(shí)調(diào)用");
}
//頁(yè)面終結(jié)時(shí)調(diào)用
- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView {
    
    NSLog(@"頁(yè)面終結(jié)時(shí)調(diào)用");
}
// 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 {
    
    NSLog(@"接收到服務(wù)器跳轉(zhuǎn)請(qǐng)求之后調(diào)用");
}
//證書驗(yàn)證處理 基本上無需添加此代理方法
- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(nonnull void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler {

    NSLog(@"證書驗(yàn)證處理");
    // 判斷服務(wù)器采用的驗(yàn)證方法
    if (challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust) {
        // 如果沒有錯(cuò)誤的情況下 創(chuàng)建一個(gè)憑證挪鹏，并使用證書
        if (challenge.previousFailureCount == 0) {
            NSURLCredential *credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
            completionHandler(NSURLSessionAuthChallengeUseCredential, credential);
        }else {
             //驗(yàn)證失敗见秽，取消本次驗(yàn)證
            completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, nil);
        }
    }else {
        completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, nil);
        
    }
}

// 在收到響應(yīng)后，決定是否跳轉(zhuǎn)
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {
    
    NSLog(@"在收到響應(yīng)后讨盒，決定是否跳轉(zhuǎn)");
    decisionHandler(WKNavigationResponsePolicyAllow);
}
// 在發(fā)送請(qǐng)求之前解取，決定是否跳轉(zhuǎn)
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    
    NSLog(@"在發(fā)送請(qǐng)求之前，決定是否跳轉(zhuǎn)");
    decisionHandler(WKNavigationActionPolicyAllow);
}
// 計(jì)算wkWebView進(jìn)度條
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    
    if ([keyPath isEqualToString:@"estimatedProgress"]) {
        NSLog(@"estimatedProgress");
        CGFloat newprogress = [[change objectForKey:NSKeyValueChangeNewKey] doubleValue];
        if (newprogress == 1) {
            self.progressView.hidden = YES;
            [self.progressView setProgress:0 animated:NO];
        }else {
            self.progressView.hidden = NO;
            [self.progressView setProgress:newprogress animated:YES];
        }
    }else if ([keyPath isEqualToString:@"title"]) {
        NSLog(@"title");
        self.title = self.webView.title;
    }else if ([keyPath isEqualToString:@"loading"]) {
        
        NSLog(@"loading");
    }
}

#pragma mark ----WKUIDelegate協(xié)議----

/**
 *  web界面中有彈出警告框時(shí)調(diào)用
 *
 *  @param webView           實(shí)現(xiàn)該代理的webview
 *  @param message           警告框中的內(nèi)容
 *  @param frame             主窗口
 *  @param completionHandler 警告框消失調(diào)用
 */
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(nonnull WKFrameInfo *)frame completionHandler:(nonnull void (^)(void))completionHandler {
    // js 里面的alert實(shí)現(xiàn)返顺，如果不實(shí)現(xiàn)禀苦，網(wǎng)頁(yè)的alert函數(shù)無效
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示"
                                                                             message:message
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"確定"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler();
                                                      }]];
    
    [self presentViewController:alertController animated:YES completion:^{}];
    
}


/**
 web界面中有彈出選擇框

 @param webView 實(shí)現(xiàn)該代理的webview
 @param message 警告框中的內(nèi)容
 @param frame 主窗口
 @param completionHandler 警告框消失調(diào)用 得到選擇結(jié)果
 */
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler {
    //  js 里面的alert實(shí)現(xiàn)，如果不實(shí)現(xiàn)遂鹊，網(wǎng)頁(yè)的alert函數(shù)無效  ,
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示"
                                                                             message:message
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"確定"
                                                        style:UIAlertActionStyleDefault
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler(YES);
                                                      }]];
    [alertController addAction:[UIAlertAction actionWithTitle:@"取消"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action){
                                                          completionHandler(NO);
                                                      }]];
    
    [self presentViewController:alertController animated:YES completion:^{}];
    
}


/**
 web界面中有彈出輸入框

 @param webView 實(shí)現(xiàn)該代理的webview
 @param prompt 輸入框的提示內(nèi)容
 @param defaultText 默認(rèn)的填寫內(nèi)容
 @param frame 主窗口
 @param completionHandler 警告框消失調(diào)用 得到輸入內(nèi)容
 */
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(nonnull WKFrameInfo *)frame completionHandler:(nonnull void (^)(NSString * _Nullable))completionHandler {
    
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:prompt message:nil preferredStyle:UIAlertControllerStyleAlert];
    
    [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.textColor = [UIColor blackColor];
        textField.text = defaultText;
    }];
    
    [alert addAction:[UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        completionHandler([[alert.textFields lastObject] text]);
    }]];
    
    [self presentViewController:alert animated:YES completion:NULL];
}


// 記得取消監(jiān)聽
- (void)dealloc {
    [self.webView removeObserver:self forKeyPath:@"estimatedProgress"];
    [self.webView removeObserver:self forKeyPath:@"loading"];//移除kvo
    [self.webView removeObserver:self forKeyPath:@"title"];
}

/**
 清理緩存
 */
- (void)clearWbCache {
    
    [[NSURLCache sharedURLCache] removeAllCachedResponses];
    [[NSURLCache sharedURLCache] setDiskCapacity:0];
    [[NSURLCache sharedURLCache] setMemoryCapacity:0];
}

- (WKWebView *)webView {
    
    if (!_webView) {
        _webView = [[WKWebView alloc] initWithFrame:self.view.frame];
        _webView.navigationDelegate = self;
        _webView.UIDelegate = self;
        [_webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil];
        [_webView addObserver:self forKeyPath:@"loading" options:NSKeyValueObservingOptionNew context:nil];
        [_webView addObserver:self forKeyPath:@"title" options:NSKeyValueObservingOptionNew context:nil];
        [self.view insertSubview:_webView belowSubview:self.progressView];
    }
    return _webView;
}

- (UIProgressView *)progressView {
    
    if (!_progressView) {
        
        _progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, 0)];
        self.progressView.tintColor = [UIColor orangeColor];
        self.progressView.trackTintColor = [UIColor clearColor];
        [self.view addSubview:self.progressView];
    }
    return _progressView;
}

最后編輯于：2017.12.27 21:10:50

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一篇文章搞定WKWebView（iOS 8之后最優(yōu)Web解決框架）

WKNavigationDelegate代理方法

WKUIDelegate代理方法

添加進(jìn)度條UIProgressView

頁(yè)面代碼示例 下載Demo

頁(yè)面代碼示例下載Demo