Javascript UIWebview中的NSString

我的项目中有一个

NSString

和一个webView（Objective-C for iPhone），我在webView中调用了

index.html

，并在其中插入了我的脚本（javascript）

如何在脚本和viceversa中将NSString作为var传递

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这是一个字符串，但我不太理解。

将字符串发送到web视图：

[webView stringByEvaluatingJavaScriptFromString:@"YOUR_JS_CODE_GOES_HERE"];

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将字符串从web视图发送到Obj-C：

声明实现UIWebViewDelegate协议（在.h文件中）：

在Objective-C（在.m文件中）中也有：

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将NSString传递到UIWebView（用作javascript字符串）时，需要确保转义换行符以及单引号/双引号：

NSString *html = @"<div id='my-div'>Hello there</div>";

html = [html stringByReplacingOccurrencesOfString:@"\'" withString:@"\\\'"];
html = [html stringByReplacingOccurrencesOfString:@"\"" withString:@"\\\""];
html = [html stringByReplacingOccurrencesOfString:@"\n" withString:@"\\n"];
html = [html stringByReplacingOccurrencesOfString:@"\r" withString:@""];

NSString *javaScript = [NSString stringWithFormat:@"injectSomeHtml('%@');", html];
[_webView stringByEvaluatingJavaScriptFromString:javaScript];

NSString*html=@“你好”；
html=[html stringByReplacingOccurrencesOfString:@“\'”和字符串：@“\\\'”]；
html=[html StringByReplacingOfString:@“\”和字符串：@“\\\”]；
html=[html StringByReplacingOfString:@“\n”带字符串：@“\\n”]；
html=[html stringByReplacingOccurrencesOfString:@“\r”带字符串：@”“；
NSString*javaScript=[NSString stringWithFormat:@“injectSomeHtml（'%@'）；”，html]；
[\u webView stringByEvaluatingJavaScriptFromString:javaScript]；

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@Michael Kessler很好地描述了反向过程

我已将UIWebView和UIWebViewDelegate添加到标记中（而不是xcode和html），反之亦然？：-）

// right after creating the web view
webView.delegate = self;

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    NSString *url = [[request URL] absoluteString];

    static NSString *urlPrefix = @"myApp://";

    if ([url hasPrefix:urlPrefix]) {
        NSString *paramsString = [url substringFromIndex:[urlPrefix length]];
        NSArray *paramsArray = [paramsString componentsSeparatedByString:@"&"];
        int paramsAmount = [paramsArray count];

        for (int i = 0; i < paramsAmount; i++) {
            NSArray *keyValuePair = [[paramsArray objectAtIndex:i] componentsSeparatedByString:@"="];
            NSString *key = [keyValuePair objectAtIndex:0];
            NSString *value = nil;
            if ([keyValuePair count] > 1) {
                value = [keyValuePair objectAtIndex:1];
            }

            if (key && [key length] > 0) {
                if (value && [value length] > 0) {
                    if ([key isEqualToString:@"param"]) {
                        // Use the index...
                    }
                }
            }
        }

        return NO;
    }
    else {
        return YES;
    }
}

location.href = 'myApp://param=10';

NSString *html = @"<div id='my-div'>Hello there</div>";

html = [html stringByReplacingOccurrencesOfString:@"\'" withString:@"\\\'"];
html = [html stringByReplacingOccurrencesOfString:@"\"" withString:@"\\\""];
html = [html stringByReplacingOccurrencesOfString:@"\n" withString:@"\\n"];
html = [html stringByReplacingOccurrencesOfString:@"\r" withString:@""];

NSString *javaScript = [NSString stringWithFormat:@"injectSomeHtml('%@');", html];
[_webView stringByEvaluatingJavaScriptFromString:javaScript];