[英]UIWebView delegate method shouldStartLoadWithRequest: equivalent in WKWebView?
I have a module inside my iOS 7+ app which is a UIWebView.我的 iOS 7+ 应用程序中有一个模块,它是一个 UIWebView。 The html page loads a javascript that creates custom-shaped buttons (using the Raphaeljs library).
html 页面加载创建自定义形状按钮的 javascript(使用 Raphaeljs 库)。 With UIWebView, I set delegate to self.
使用 UIWebView,我将委托设置为 self。 The delegate method
webView: shouldStartLoadWithRequest: navigationType:
is called each time one of my custom button is pressed.每次按下我的自定义按钮之一时,都会调用委托方法
webView: shouldStartLoadWithRequest: navigationType:
。 The requests should not be handled by the html, but rather by the iOS code.请求不应由 html 处理,而应由 iOS 代码处理。 So I used a request convention (read somewhere here on stackoverflow) using "inapp" as the scheme of my requests.
所以我使用了一个请求约定(在stackoverflow上的某个地方阅读),使用“inapp”作为我的请求方案。 I then check for the host and take the appropriate action.
然后我检查主机并采取适当的措施。
This code works fine on iOS 7. But the web views appear blank on iOS 8 (bug?), so I decided to use WKWebView for iOS 8 devices.此代码在 iOS 7 上运行良好。但在 iOS 8 上 Web 视图显示为空白(错误?),因此我决定将 WKWebView 用于 iOS 8 设备。 The web views now render fine (and amazingly faster!), but my buttons have no effect.
Web 视图现在渲染得很好(而且速度惊人地快!),但我的按钮没有效果。
I tried using - (WKNaviation *)loadRequest:(NSURLRequest *)request
, but it's not called.我尝试使用
- (WKNaviation *)loadRequest:(NSURLRequest *)request
,但它没有被调用。
I can't find a direct equivalent of the UIWebView delegate method webView: shouldStartLoadWithRequest: navigationType:
.我找不到 UIWebView 委托方法
webView: shouldStartLoadWithRequest: navigationType:
的直接等效项。 What's the best way of handling those requests with WKWebView?使用 WKWebView 处理这些请求的最佳方式是什么?
I've been looking for a good explanation myself, but haven't found one. 我自己一直在寻找一个好的解释,但还没找到。 I've used the following in my app and everything seems to work ( Edit: updated based on ccoroom's comment ):
我在我的应用程序中使用了以下内容,一切似乎都有效( 编辑:根据ccoroom的评论更新):
UIWebViewDelegate - webView:shouldStartLoadWithRequest:navigationType:
WKNavigationDelegate - webView:decidePolicyForNavigationAction:decisionHandler:
Here's the other UIWebViewDelegate
methods: 这是其他
UIWebViewDelegate
方法:
UIWebViewDelegate - webViewDidStartLoad:
WKNavigationDelegate - webView:didCommitNavigation:
UIWebViewDelegate - webViewDidFinishLoad:
WKNavigationDelegate - webView:didFinishNavigation:
UIWebViewDelegate - webView:didFailLoadWithError:
WKNavigationDelegate - webView:didFailNavigation:withError:
- webView:didFailProvisionalNavigation:withError:
I'd love for someone to confirm this for me though. 我喜欢有人为我证实这一点。
Edit: Actually, I've answered the question you had in the title (although I'm no longer confident that webView:didCommitNavigation:
is called at the exact same point in the lifecycle), but re-reading your description it looks like what you actually need to know about is how to reimplement a Javascript/Objective-C bridge using WKWebView. 编辑:实际上,我已经回答了你在标题中提到的问题(虽然我不再相信
webView:didCommitNavigation:
在生命周期中的完全相同的点被调用),但重新阅读你的描述看起来像是什么你真的需要知道如何使用WKWebView重新实现Javascript / Objective-C桥。 So have a look at my other answer. 那么看看我的另一个答案。
To answer the original question, the equivalent of webView:shouldStartLoadWithRequest:navigationType:
in UIWebView is webView:decidePolicyForNavigationAction:decisionHandler:
in WKWebView. 要回答原始问题,相当于
webView:shouldStartLoadWithRequest:navigationType:
在UIWebView中是webView:decidePolicyForNavigationAction:decisionHandler:
在WKWebView中。 These methods are called before each request is made (including the initial request) and provide the ability to allow/disallow it. 在每个请求发出之前调用这些方法(包括初始请求)并提供允许/禁止它的能力。
Just use the following method , it's a part of WKNavigationDelegate 只需使用以下方法,它就是WKNavigationDelegate的一部分
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
NSURLRequest *request = navigationAction.request;
NSString *url = [[request URL]absoluteString];
decisionHandler(WKNavigationActionPolicyAllow);
}
Re-reading your description it looks like what you actually need to know about is how to reimplement a Javascript/Objective-C bridge using WKWebView. 重新阅读您的描述看起来您真正需要了解的是如何使用WKWebView重新实现Javascript / Objective-C桥接。
I've just done this myself, following the tutorial at http://tetontech.wordpress.com/2014/07/17/objective-c-wkwebview-to-javascript-and-back/ and the info at http://nshipster.com/wkwebkit/ 我刚刚完成了这个,按照http://tetontech.wordpress.com/2014/07/17/objective-c-wkwebview-to-javascript-and-back/上的教程和http://上的信息nshipster.com/wkwebkit/
WKWebView has a built-in way of communicating between Javascript and Objective-C/Swift: WKScriptMessageHandler
. WKWebView有一种内置的Javascript和Objective-C / Swift:
WKScriptMessageHandler
之间的通信方式。
First, include the WebKit headers and WKScriptMessageHandler
protocol in your view controller's header: 首先,在视图控制器的标题中包含WebKit标头和
WKScriptMessageHandler
协议:
#import <UIKit/UIKit.h>
#import <WebKit/WebKit.h>
@interface ViewController : UIViewController <WKScriptMessageHandler>
@end
The when initialising your WKWebView
, you need to configure it with a script message handler. 初始化
WKWebView
,需要使用脚本消息处理程序对其进行配置。 Name it whatever you want, but to me it seems like naming it for your app makes sense. 把它命名为你想要的任何东西,但对我来说,似乎为你的应用程序命名它是有道理的。
WKWebViewConfiguration *theConfiguration =
[[WKWebViewConfiguration alloc] init];
[theConfiguration.userContentController
addScriptMessageHandler:self name:@"myApp"];
_theWebView = [[WKWebView alloc] initWithFrame:self.view.frame
configuration:theConfiguration];
[_theWebView loadRequest:request];
[self.view addSubview:_theWebView];
Now, implement userContentController:didReceiveScriptMessage:
. 现在,实现
userContentController:didReceiveScriptMessage:
. This fires when your webview receives a message, so it does the work you were previously doing with webView:shouldStartLoadWithRequest:navigationType:
. 当您的webview收到消息时会触发此消息,因此它执行您之前使用
webView:shouldStartLoadWithRequest:navigationType:
执行的工作webView:shouldStartLoadWithRequest:navigationType:
.
- (void)userContentController:(WKUserContentController *)userContentController
didReceiveScriptMessage:(WKScriptMessage *)message {
NSDictionary *sentData = (NSDictionary *)message.body;
NSString *messageString = sentData[@"message"];
NSLog(@"Message received: %@", messageString);
}
You're now ready to receive messages from Javascript. 您现在已准备好接收来自Javascript的消息。 The function call you need to add to your Javascript is this:
你需要添加到你的Javascript函数调用是这样的:
window.webkit.messageHandlers.myApp.postMessage({"message":"Hello there"});
In Swift you can do something like this: 在Swift中,您可以执行以下操作:
func webView(webView: WKWebView, decidePolicyForNavigationAction navigationAction: WKNavigationAction, decisionHandler: (WKNavigationActionPolicy) -> Void) {
switch navigationAction.request.URLString {
case "http://action.is.needed/some-action":
self.someFunc()
decisionHandler(.Cancel)
break
default:
decisionHandler(.Allow)
break
}
}
And this is the link in web page: 这是网页中的链接:
<a href="http://action.is.needed/some-action">Hello world!</a>
for swift 4.2 : (taking from Yifei He 何一非. ) 对于swift 4.2 :(取自Yifei He何一非。)
func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: (WKNavigationActionPolicy) -> Void) {
let url = navigationAction.request.url
let urlStr = url?.absoluteString
switch urlStr {
case BASE_URL:
//self.someFunc()
decisionHandler(.cancel)
break
default:
decisionHandler(.allow)
break
}
}
You can add Observer for your WKWebView 您可以为WKWebView添加Observer
static void* keyValueObservingContext = &keyValueObservingContext;
[webView addObserver:self forKeyPath:@"URL" options:0 context:keyValueObservingContext];
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
if ([keyPath isEqualToString:@"URL"]){
// do something
}
}
Don't forget to remove it in viewWillDisappear 不要忘记在viewWillDisappear中删除它
-(void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
[webView removeObserver:self forKeyPath:@"URL"];
}
Using for Delegate methods on migrate for UIWebview to WKWebview使用 for Delegate 方法将UIWebview迁移到WKWebview
UIWebViewDelegate => WKNavigationDelegate UIWebViewDelegate => WKNavigationDelegate
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