WKWebViewUse
Simple use of WKWebView
屏幕截图
添加WKWebView
WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];
configuration.userContentController = [[WKUserContentController alloc] init];
//注册方法
[configuration.userContentController addScriptMessageHandler:self name:@"jsCallOC"];
WKWebView *webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:configuration];
webView.navigationDelegate = self;
webView.UIDelegate = self;
NSString *path = [[NSBundle mainBundle] pathForResource:@"JSCallOC.html" ofType:nil];
NSURL *url = [[NSURL alloc] initFileURLWithPath:path];
[webView loadFileURL:url allowingReadAccessToURL:url];
[webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil];
[webView addObserver:self forKeyPath:@"title" options:NSKeyValueObservingOptionNew context:nil];
[self.view addSubview:webView];
self.webView = webView;WKNavigationDelegate
// 在发送请求之前，决定是否跳转
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
{
NSString *str = navigationAction.request.URL.absoluteString;
if ([str hasPrefix:@""]) {
decisionHandler(WKNavigationActionPolicyCancel);
}
else {
decisionHandler(WKNavigationActionPolicyAllow);
}
}
// 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);
}
// 页面开始加载时调用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation
{
}
// 接收到服务器跳转请求之后调用
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation
{
}
// 页面加载失败时调用
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error
{
}
// 当内容开始返回时调用
- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation
{
}
// 页面加载完成之后调用
- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation
{
}
// 页面加载失败时调用
- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error
{
}
// 身份认证
- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential * _Nullable credential))completionHandler
{
if ([challenge previousFailureCount] == 0) {
NSURLCredential *newCredential;
newCredential = [NSURLCredential credentialWithUser:@"user"
password:@"password"
persistence:NSURLCredentialPersistenceNone];
[[challenge sender] useCredential:newCredential
forAuthenticationChallenge:challenge];
}
else {
UIAlertController *alertVC = [UIAlertController alertControllerWithTitle:@"Authentication error" message:@"Invalid Credentials" preferredStyle:UIAlertControllerStyleAlert];
[alertVC addAction:[UIAlertAction actionWithTitle:@"confirm" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
}]];
[self presentViewController:alertVC animated:YES completion:^{
}];
}
}
// 当webView视图的网页内容被终止时调用
// 当WKWebView总体内存占用过大，页面即将白屏的时候，系统会调用上面的回调函数，我们在该函数里执行[webView reload](这个时候 webView.URL 取值尚不为 nil）解决白屏问题。在一些高内存消耗的页面可能会频繁刷新当前页面，H5也要做相应的适配操作。
- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView API_AVAILABLE(macosx(10.11), ios(9.0))
{
[self.webView reload];
}WKUIDelegate
// 创建一个新的WebView
- (nullable WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures
{
return nil;
}
// webView关闭
- (void)webViewDidClose:(WKWebView *)webView API_AVAILABLE(macosx(10.11), ios(9.0))
{
}
// 警告框
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler
{
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示"
message:message preferredStyle:UIAlertControllerStyleAlert];
[alertController addAction:[UIAlertAction actionWithTitle:@"确定"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction *action) {
completionHandler();
}]];
[self presentViewController:alertController animated:YES completion:^{}];
}
// 确认框
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler
{
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示"
message:message preferredStyle:UIAlertControllerStyleAlert];
[alertController addAction:[UIAlertAction actionWithTitle:@"确定"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction *action) {
completionHandler(YES);
}]];
[self presentViewController:alertController animated:YES completion:^{}];
}
// 输入框
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * _Nullable result))completionHandler
{
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:prompt message:defaultText preferredStyle:UIAlertControllerStyleAlert];
[alertController addAction:[UIAlertAction actionWithTitle:@"确定"
style:UIAlertActionStyleDefault
handler:^(UIAlertAction *action) {
completionHandler(@"");
}]];
[alertController addAction:[UIAlertAction actionWithTitle:@"取消"
style:UIAlertActionStyleCancel
handler:^(UIAlertAction *action){
completionHandler(@"");
}]];
[self presentViewController:alertController animated:YES completion:^{}];
}
// 能否预览用户触摸的元素
- (BOOL)webView:(WKWebView *)webView shouldPreviewElement:(WKPreviewElementInfo *)elementInfo API_AVAILABLE(ios(10.0))
{
return YES;
}
// 定制预览控制器
- (nullable UIViewController *)webView:(WKWebView *)webView previewingViewControllerForElement:(WKPreviewElementInfo *)elementInfo defaultActions:(NSArray<id <WKPreviewActionItem>> *)previewActions API_AVAILABLE(ios(10.0))
{
return nil;
}
// 可弹出的视图控制器
- (void)webView:(WKWebView *)webView commitPreviewingViewController:(UIViewController *)previewingViewController API_AVAILABLE(ios(10.0))
{
}WKScriptMessageHandler
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
{
NSLog(@"------name:%@\\\\n body:%@\\\\n",message.name,message.body);
}