webview与js的通信

最新推荐文章于 2023-10-26 07:30:00 发布

原创最新推荐文章于 2023-10-26 07:30:00 发布 · 597 阅读

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CC 4.0 BY-SA版权

文章标签：

#webview #html #js

本文详细介绍了在iOS应用中，如何通过Webview加载远程HTML页面、其他文件和PDF，以及如何实现Webview与JavaScript的交互，包括代理方法的使用，如webViewDidStartLoad和webViewDidFinishLoad，以及提供给JavaScript调用的方法，例如打开相机和拨打电话的功能。

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JS是操作网页的利器，利用好JS才能真正在应用中随心所欲的操作网页。核心方法：stringByEvaluatingJavaScriptFromString

(void)viewDidLoad
{
[super viewDidLoad];

[self loadRemoteHTML];
}强调内容

pragma mark 加载远程的HTML页面

(void)loadRemoteHTML {
NSURL *url = [NSURL URLWithString:@”http://192.168.1.106:8080/MJServer/“];

self.webView.delegate = self;
[self.webView loadRequest:[NSURLRequest requestWithURL:url]];
}

pragma mark 加载其他文件

(void)loadRemoteTxt {
NSURL *url = [NSURL URLWithString:@”http://192.168.1.106:8080/MJServer/abc.txt“];

self.webView.delegate = self;
[self.webView loadRequest:[NSURLRequest requestWithURL:url]];
}

pragma mark 加载PDF文件

(void)loadLocalPDF {
//[self.webView loadData:<#(NSData )#> MIMEType:<#(NSString )#> textEncodingName:<#(NSString )#> baseURL:<#(NSURL )#>];

NSURL *url = [NSURL fileURLWithPath:@”/Users/apple/Desktop/第10章-网络.pdf”];

self.webView.delegate = self;
[self.webView loadRequest:[NSURLRequest requestWithURL:url]];
}

pragma mark 加载HTML字符串

(void)loadHTMLString {
NSURL *url = [NSURL fileURLWithPath:@”/Users/apple/Pictures”];
[self.webView loadHTMLString:@”” baseURL:url];
}

pragma mark - webview代理方法

(void)webViewDidStartLoad:(UIWebView *)webView {
NSLog(@”开始加载页面”);
[MBProgressHUD showMessag:@”哥正在帮你加载…” toView:self.view];
}
(void)webViewDidFinishLoad:(UIWebView *)webView {
NSLog(@”页面加载完毕”);
[MBProgressHUD hideHUDForView:self.view animated:YES];

self.backItem.enabled = self.webView.canGoBack;
self.forawrdItem.enabled = self.webView.canGoForward;

self.titleItem.title = [self.webView stringByEvaluatingJavaScriptFromString:@”document.title”];

//[self.webView stringByEvaluatingJavaScriptFromString:@”fn();”];
}

pragma mark webview每次加载之前都会调用这个方法

当需要在这个UIWebview加载的视图中在点击进入其它h5界面时，也需要在这个方法里面截取url 请求加载界面
// 如果返回NO，代表不允许加载这个请求
- (BOOL)webView:(UIWebView )webView shouldStartLoadWithRequest:(NSURLRequest )request navigationType:(UIWebViewNavigationType)navigationType {
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NSString *rightUrl = request.URL.absoluteString;
NSRange range = [rightUrl rangeOfString:_urlSuffix];//带？
NSRange range2 = [rightUrl rangeOfString:_urlSuffix2];//不带?
NSRange range3 = [rightUrl rangeOfString:@”?”];
[[NSUserDefaults standardUserDefaults]setBool:YES forKey:@”isQQReloadView”];
if (range3.location == NSNotFound && range.location == NSNotFound) {//没有问号，没有问号后缀
[self.webView loadRequest:[[NSURLRequest alloc] initWithURL:[NSURL URLWithString:[rightUrl stringByAppendingString:_urlSuffix]]]];
// [self doIfInWebWithUrl:rightUrl];
return YES;
}else if (range3.location != NSNotFound && range2.location == NSNotFound ){//有问号没有后缀
[self.webView loadRequest:[[NSURLRequest alloc] initWithURL:[NSURL URLWithString:[rightUrl stringByAppendingString:_urlSuffix2]]]];
// [self doIfInWebWithUrl:rightUrl];
return YES;
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// 说明协议头是ios
if ([@”ios” isEqualToString:request.URL.scheme]) {
NSString *url = request.URL.absoluteString;
NSRange range = [url rangeOfString:@”:”];
NSString *method = [request.URL.absoluteString substringFromIndex:range.location + 1];

    SEL selector = NSSelectorFromString(method);

    if ([self respondsToSelector:selector]) {
        [self performSelector:selector];
    }

    return NO;
}

return YES;

}