WKWebView实现简单的轻应用

WKWebView

WKWebView是现代 WebKit API 在 iOS 8 和 OS X Yosemite 应用中的核心部分。它代替了 UIKit 中的UIWebView和 AppKit 中的WebView，提供了统一的跨双平台 API。如果你的app只需要支持iOS8.0之后的版本，那么非常建议你使用WKWebView来替代UIWbeView，性能不止提升了一个档次。

WKWebView与js交互

所谓轻应用，简单的来说就是原生应用集成了html页面入口，还能通过js与native实现交互，例如：通过js调用native封装好的viewController实现扫描与对应反馈功能。WKWebView初始化：

- (void)viewDidLoad {

[superviewDidLoad];

WKWebViewConfiguration*config = [[WKWebViewConfigurationalloc]init];

[config.userContentControlleraddScriptMessageHandler:self.jsBridgename:@"observe"];

self.webView= [[WKWebViewalloc]initWithFrame:CGRectMake(0,0,self.view.frame.size.width,self.view.frame.size.height)configuration:config];

[self.viewaddSubview:self.webView];

self.jsBridge= [JSBridgeManagerjsBridgeWithDelegate:self];

self.webView.UIDelegate=self.jsBridge;

self.webView.navigationDelegate=self.jsBridge;

NSString*url = [self.pathstringByReplacingOccurrencesOfString:@" "withString:@""];

ICLog(@"webView: %@", url);

[self.webViewloadRequest:[NSURLRequestrequestWithURL:[NSURLURLWithString:url]]];

}

在JSBridgeManager类里进行代理设置

简单的wkwebview的代理

#pragma mark - WKNavigationDelegate

页面开始加载时调用

- (void)webView:(WKWebView*)webView didStartProvisionalNavigation:(WKNavigation*)navigation {

NSLog(@"%s -- %@",__FUNCTION__, webView.URL);

}

当内容开始返回时调用

- (void)webView:(WKWebView*)webView didCommitNavigation:(WKNavigation*)navigation {

NSLog(@"%s",__FUNCTION__);

}

页面加载完成之后调用

- (void)webView:(WKWebView*)webView didFinishNavigation:(WKNavigation*)navigation {

NSLog(@"%s",__FUNCTION__);

}

加载失败时调用

- (void)webView:(WKWebView*)webView didFailProvisionalNavigation:(WKNavigation*)navigation withError:(NSError*)error {

NSLog(@"%s",__FUNCTION__);

}

接收到服务器跳转请求之后调用

- (void)webView:(WKWebView*)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation*)navigation {

NSLog(@"%s",__FUNCTION__);

}

在收到响应后，决定是否跳转

- (void)webView:(WKWebView*)webView decidePolicyForNavigationResponse:(WKNavigationResponse*)navigationResponse decisionHandler:(void(^)(WKNavigationResponsePolicy))decisionHandler {

//允许跳转

decisionHandler(WKNavigationResponsePolicyAllow);

return;

}

在发送请求之前，决定是否跳转<处理js与native交互代码>

- (void)webView:(WKWebView*)webView decidePolicyForNavigationAction:(WKNavigationAction*)navigationAction decisionHandler:(void(^)(WKNavigationActionPolicy))decisionHandler {

NSLog(@"%@", navigationAction.request.URL);

NSURL*url = navigationAction.request.URL;

if([[[urlscheme]lowercaseString]isEqualToString:kTGJSBridgeProtocolScheme]) {

[selfdispatchNotification:[urlhost]fromWebView:webView];

}else{

//forward

}

decisionHandler(WKNavigationActionPolicyAllow);

}

处理js发送的请求，如果以某个jsbridge为scheme的则为交互信息

- (void)dispatchNotification:(NSString*)notificationString

fromWebView:(WKWebView*)webView

{

if([notificationStringhasPrefix:kTGJSBridgePostNotificationWithId]) {

NSDictionary*responseDict = [selffetchNotificationWithStr:notificationStringfromWebView:webView];

if([self.delegaterespondsToSelector:@selector(jsBridge:didReceivedNotificationDictionary:fromWebView:)]) {

[self.delegatejsBridge:selfdidReceivedNotificationDictionary:responseDictfromWebView:webView];

}

}else{

}

}

decidePolicyForNavigationAction能读取到由js发起的请求，native截取对应的url，读取与web端定义的协议规则，可进行简单的通讯。