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    <p>You can get a JSContext from a UIWebView with a key path:</p> <pre><code>UIWebView *webView = [[UIWebView alloc] init]; JSContext *ctx = [webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"]; ctx[@"document"][@"body"][@"style"][@"background"] = @"steelblue"; </code></pre> <p>Apple never got around to documenting any of the new JavaScriptCore APIs, so I'm not sure if this counts as an internal/undocumented API or not. I have an app approved that uses this method.</p> <p><strong>Update</strong>: Another alternative solution suggested at <a href="https://github.com/TomSwift/UIWebView-TS_JavaScriptContext" rel="noreferrer">https://github.com/TomSwift/UIWebView-TS_JavaScriptContext</a> is to make a category on <code>NSObject</code> and use it to implement WebKit's documented <code>didCreateJavaScriptContext</code> delegate callback. To paraphrase that implementation, you can just call <code>[NSObject contextForWebView:myWebView]</code> to grab the JSContext for a UIWebView:</p> <pre><code>@implementation NSObject(JSContextTracker) + (NSMapTable *)JSContextTrackerMap { static NSMapTable *contextTracker; static dispatch_once_t onceToken; dispatch_once(&amp;onceToken, ^{ contextTracker = [NSMapTable strongToWeakObjectsMapTable]; }); return contextTracker; } - (void)webView:(id)unused didCreateJavaScriptContext:(JSContext *)ctx forFrame:(id)alsoUnused { NSAssert([ctx isKindOfClass:[JSContext class]], @"bad context"); if (!ctx) return; NSMapTable *map = [NSObject JSContextTrackerMap]; static long contexts = 0; NSString *contextKey = [NSString stringWithFormat:@"jsctx_%@", @(contexts++)]; [map setObject:ctx forKey:contextKey]; ctx[@"JSContextTrackerMapKey"] = contextKey; // store the key to the map in the context itself } + (JSContext *)contextForWebView:(UIWebView *)webView { // this will trigger didCreateJavaScriptContext if it hasn't already been called NSString *contextKey = [webView stringByEvaluatingJavaScriptFromString:@"JSContextTrackerMapKey"]; JSContext *ctx = [[NSObject JSContextTrackerMap] objectForKey:contextKey]; return ctx; } @end </code></pre>
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