iOS web view 与 js 交互

移动应用中许多复杂的且经常改动的页面会使用H5进行代替native，这里就会使用到js和webview的交互

iOS里面，UIWebView提供了方法stringByEvaluatingJavaScriptFromString:使js和webview互通

这里我提供一种思路，仅供参考

1.加载js函数

var Test = {};
Test.platform = {
name: 'IOS'
};
// 返回App识别ID
Test.getAppId = function(){
    return '[AppId]';
};
// 返回用户Id
Test.getUserId = function(){
    return '[UserId]';
};
// 返回当前AppVersion
Test.getAppVersion = function(){
    return '[AppVersion]';
};
Test.open = function(str){
    setTimeout(function(){
               document.location = 'Test://open/'+str;
               },50);
};
window.Test = Test;

2.简单几个函数，加载前替换掉自己的value，

for (NSString *key in dict) {
        NSString *placekey = [NSString stringWithFormat:@"[%@]", key];
        NSString *value = [dict[key] stringValue];
        if (! value || [value isEqual:[NSNull null]]) {
            jsString = [jsString stringByReplacingOccurrencesOfString:placekey withString:@"null"];
        }else{
            jsString = [jsString stringByReplacingOccurrencesOfString:placekey withString:value];
        }
    }

 3.加入webview的js里面：

   [webView stringByEvaluatingJavaScriptFromString:jsString];

 当js调用native的操作时候，可以使用Test.open(firstViewController?paramter=123)
native的delegate将会调用：

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType

这里的request.url将会是：

Test://open/firstViewController?paramter=123

 进入我们自己解析方法，对此url进行不同的解析和跳转

NSString *requestString = [[request URL] absoluteString];
    NSArray *components = [requestString componentsSeparatedByString:@"://"];

    if (components[0] && [components count] > 1) {//如果协议抬头为Test或者为其他则走自定义流程
        NSString *content = components[1];
        NSArray *controller = [content componentsSeparatedByString:@"/"];
        if (controller.count > 1 && [controller[0] isEqual:@"open"]) {//打开特定的controller
            [self openController:controller[1]];
        }
    }

    return NO;