WKWebView中经常用到的操作

WKWebView相对UIWebView的直观优势

• 更多的支持HTML5的特性
• 官方宣称的高达60fps的滚动刷新率以及内置手势
• 占用更少的内存

现在总结一下我们用WKWebView时经常用到的一些操作

页面允许跳转与取消

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler{
    if (navigationAction.targetFrame == nil) {
        [webView loadRequest:navigationAction.request];
    }
    if ([navigationAction.request.URL.absoluteString containsString:@"wexin://"]){   //当url中存在weixin://时不进行页面跳转,进行其它操作
    //TODO: 做一些其它操作
    decisionHandler(WKNavigationActionPolicyCancel);
    }else{
        decisionHandler(WKNavigationActionPolicyAllow);
    }
}

WK与JS交互

//**********WK与JS交互**********
//配置
- (WKWebViewConfiguration *)configuration{
    if (!_configuration) {
        _configuration = [[WKWebViewConfiguration alloc] init];
        WKUserContentController *userContentController = [[WKUserContentController alloc] init];
        //jumpQRCode是和JS约定好的字符串,保证JS调用OC时判断相同就行,没有具体限制
        [userContentController addScriptMessageHandler:self name:@"jumpQRCode"];	
        _configuration.userContentController = userContentController;
 self.webView.configuration = _configuration;
    }
    return _configuration;
}
//JS调用OC
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message{
    if ([message.name isEqualToString:@"openQRCode”]) {
        [self openQRCode];
    }
}
- (void)openQRCode{
//OC调用JS
NSString *JSResult = [NSString stringWithFormat:@"callback('%@','%@')", index,strScan];	//JS方法名和参数
[self.webView evaluateJavaScript:JSResult completionHandler:^(id _Nullable result, NSError * _Nullable error) {
    NSLog(@"完成....");
}];
}

WKWebView加载Webp

Cookie丢失

NSString *cookieStr = [self setJSCookie];
WKUserScript *cookieScipt = [[WKUserScript alloc] initWithSource:cookieStr injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:NO];
WKUserContentController *wku = [[WKUserContentController alloc] init];
[wku addScriptMessageHandler:self name:@"openPay"];
[wku addUserScript:cookieScipt];

-(NSString *)setJSCookie{
     NSMutableDictionary *cookiesDic = [[LFCacheTool lf_getCacheObjectFromKey:COOKIES] mutableCopy];
    __block NSString *cookieStr = @"";
    
    [cookiesDic enumerateKeysAndObjectsUsingBlock:^(id  _Nonnull key, id  _Nonnull obj, BOOL * _Nonnull stop) {
        NSDictionary *dic = obj;
        NSString *appendString;

        if ([self.url rangeOfString:@"丢失cookie的链接"].location != NSNotFound){
            //根据后台需要的样式修改cookie(多参数少参数都可能获取失败)
              appendString= [NSString stringWithFormat:@"'%@=%@;path=/;domain=%@';",key, dic[@"Value"],@"丢失cookie的链接"];
        }
        cookieStr = [NSString stringWithFormat:@"%@document.cookie=%@",cookieStr,appendString];
    }];

    return cookieStr;
}