问题描述
在原生 iPhone 应用程序中,我使用 UIWebView
来加载网页.
In a native iPhone app, I use a UIWebView
to load a web page.
我想在网页中使用 JavaScript 与 Objective-C 代码进行通信,例如调用 Objective-C 代码中的函数.
I want to use JavaScript in the web page to communicate back with the Objective-C code, for example invoke a function in Objective-C code.
有什么方法可以实现吗?
Is there any way to implement this?
推荐答案
没有直接"的方法可以做到这一点,但您可以利用 UIWebViewDelegate
并捕获带有自定义方案的链接,因此在您的标记中,您可以编写如下内容:
There is no "direct" way to do this, but you could utilize the UIWebViewDelegate
and trap a link with a custom scheme, so in your markup, you'd write something like this:
<a href="myapp://app_action?doSomething">Do Something</a>
然后,在您的 UIWebViewDelegate
的 -webView:shouldStartLoadWithRequest:navigationType:
方法中,编写如下内容:
Then, in your UIWebViewDelegate
's -webView:shouldStartLoadWithRequest:navigationType:
method, write something like this:
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
if([[[request URL] scheme] isEqualToString:@"myapp"]) {
SEL selector = NSSelectorFromString([[request URL] query]);
if([self respondsToSelector:selector]) {
[self performSelector:selector];
} else {
//alert user of invalid URL
}
return NO;
}
return YES;
}
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