前提：iOS开发需要调用非原生的页面的时候 ，需要用到javascript来进行页面的显示，如果直接进行调用的时候，传参数的时候 ，有时候只能在后面拼接，这样做使数据的安全性，得不到有效的保证，所以引用了WebViewJavascriptBridge，但是从来没用过，这几天下了一个demo，用了一下，感觉还是比较爽的，拿出来记录一下
<!doctype html>
<html><head>
<meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1.0, maximum-scale=1.0">
<style type='text/css'>
html { font-family:Helvetica; color:#222; }
h1 { color:steelblue; font-size:24px; margin-top:24px; }
button { margin:0 3px 10px; font-size:12px; }
.logLine { border-bottom:1px solid #ccc; padding:4px 2px; font-family:courier; font-size:11px; }
</style>
</head><body>
<h1>WebViewJavascriptBridge Demo</h1>
<script>
window.onerror = function(err) {
log('window.onerror: ' + err)
}
function setupWebViewJavascriptBridge(callback) {
if (window.WebViewJavascriptBridge) { return callback(WebViewJavascriptBridge); }
if (window.WVJBCallbacks) { return window.WVJBCallbacks.push(callback); }
window.WVJBCallbacks = [callback];
var WVJBIframe = document.createElement('iframe');
WVJBIframe.style.display = 'none';
WVJBIframe.src = 'wvjbscheme://__BRIDGE_LOADED__';
document.documentElement.appendChild(WVJBIframe);
setTimeout(function() { document.documentElement.removeChild(WVJBIframe) }, 0)
}
setupWebViewJavascriptBridge(function(bridge) {
var uniqueId = 1
function log(message, data) {
var log = document.getElementById('log')
var el = document.createElement('div')
el.className = 'logLine'
el.innerHTML = uniqueId++ + '. ' + message + ':<br/>' + JSON.stringify(data)
if (log.children.length) { log.insertBefore(el, log.children[0]) }
else { log.appendChild(el) }
}
bridge.registerHandler('testJavascriptHandler', function(data, responseCallback) {
log('ObjC called testJavascriptHandler with', data)
var responseData = { 'Javascript Says':'Right back atcha!' }
log('JS responding with', responseData)
responseCallback(responseData)
})
document.body.appendChild(document.createElement('br'))
var callbackButton = document.getElementById('buttons').appendChild(document.createElement('button'))
callbackButton.innerHTML = 'Fire testObjcCallback'
callbackButton.onclick = function(e) {
e.preventDefault()
log('JS calling handler "testObjcCallback"')
bridge.callHandler('testObjcCallback', {'foo': 'bar'}, function(response) {
log('JS got response', response)
})
}
})
</script>
<div id='buttons'></div> <div id='log'></div>
</body></html>
这是demo中的html页面，我们进行实时的操作，对数据进行app，后台，html进行三方的实时交互。
#import "WebViewJavascriptBridge.h"
@interface ExampleUIWebViewController ()
@property WebViewJavascriptBridge* bridge;
@end
@implementation ExampleUIWebViewController
- (void)viewWillAppear:(BOOL)animated {
if (_bridge) { return; }
UIWebView* webView = [[UIWebView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:webView];
[WebViewJavascriptBridge enableLogging];
_bridge = [WebViewJavascriptBridge bridgeForWebView:webView];
[_bridge setWebViewDelegate:self];
[_bridge registerHandler:@"testObjcCallback" handler:^(id data, WVJBResponseCallback responseCallback) {
NSLog(@"testObjcCallback called: %@", data);
responseCallback(@"Response from testObjcCallback");
}];
[_bridge callHandler:@"testJavascriptHandler" data:@{ @"foo":@"before ready" }];
[self renderButtons:webView];
[self loadExamplePage:webView];
}
- (void)webViewDidStartLoad:(UIWebView *)webView {
NSLog(@"webViewDidStartLoad");
}
- (void)webViewDidFinishLoad:(UIWebView *)webView {
NSLog(@"webViewDidFinishLoad");
}
- (void)renderButtons:(UIWebView*)webView {
UIFont* font = [UIFont fontWithName:@"HelveticaNeue" size:11.0];
UIButton *callbackButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[callbackButton setTitle:@"Call handler" forState:UIControlStateNormal];
[callbackButton addTarget:self action:@selector(callHandler:) forControlEvents:UIControlEventTouchUpInside];
[self.view insertSubview:callbackButton aboveSubview:webView];
callbackButton.frame = CGRectMake(0, 400, 100, 35);
callbackButton.titleLabel.font = font;
UIButton* reloadButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[reloadButton setTitle:@"Reload webview" forState:UIControlStateNormal];
[reloadButton addTarget:webView action:@selector(reload) forControlEvents:UIControlEventTouchUpInside];
[self.view insertSubview:reloadButton aboveSubview:webView];
reloadButton.frame = CGRectMake(90, 400, 100, 35);
reloadButton.titleLabel.font = font;
UIButton* safetyTimeoutButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[safetyTimeoutButton setTitle:@"Disable safety timeout" forState:UIControlStateNormal];
[safetyTimeoutButton addTarget:self action:@selector(disableSafetyTimeout) forControlEvents:UIControlEventTouchUpInside];
[self.view insertSubview:safetyTimeoutButton aboveSubview:webView];
safetyTimeoutButton.frame = CGRectMake(190, 400, 120, 35);
safetyTimeoutButton.titleLabel.font = font;
}
- (void)disableSafetyTimeout {
[self.bridge disableJavscriptAlertBoxSafetyTimeout];
}
- (void)callHandler:(id)sender {
id data = @{ @"greetingFromObjC": @"Hi there, JS!" };
[_bridge callHandler:@"testJavascriptHandler" data:data responseCallback:^(id response) {
NSLog(@"testJavascriptHandler responded: %@", response);
}];
}
- (void)loadExamplePage:(UIWebView*)webView {
NSString* htmlPath = [[NSBundle mainBundle] pathForResource:@"ExampleApp" ofType:@"html"];
NSString* appHtml = [NSString stringWithContentsOfFile:htmlPath encoding:NSUTF8StringEncoding error:nil];
NSURL *baseURL = [NSURL fileURLWithPath:htmlPath];
[webView loadHTMLString:appHtml baseURL:baseURL];
}
@end
1.当我们想把app端的数据传给html的时候，首先我们要选先注册
[_bridge registerHandler:@"testObjcCallback" handler:^(id data, WVJBResponseCallback responseCallback) {
NSLog(@"testObjcCallback called: %@", data);
responseCallback(@"Response from testObjcCallback");
}];
想要在页面中进行调用的时候，我们需要调用回调方法
bridge.callHandler('testObjcCallback', {'foo': 'bar'}, function(response) {
log('JS got response', response)
})
2 .当我们想把页面的值传给app的时候，原理和上面一样 ，只是把注册和调用进行互换：页面中：
bridge.registerHandler('testJavascriptHandler', function(data, responseCallback) {
log('ObjC called testJavascriptHandler with', data)
var responseData = { 'Javascript Says':'Right back atcha!' }
log('JS responding with', responseData)
responseCallback(responseData)
})
代码中：
[_bridge callHandler:@"testJavascriptHandler" data:@{ @"foo":@"before ready" }];
注意：在这里responseCallback（）这个方法 我的理解就是把获取的数据存下来，留着备用，当真正需要的时候，调用的时候，再把数据传出去。这只是对它的简单的应用，以后真正用到的时候，会对其源码进行仔细研究一下，以后会专门更新一下源码的体会。
