UIWebView-TS_JavaScriptContext/UIWebView+TS_JavaScriptContext.m at master · TomSwift/UIWebView-TS_JavaScriptContext · GitHub

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//
// UIWebView+TS_JavaScriptContext.m
//
// Created by Nicholas Hodapp on 11/15/13.
// Copyright (c) 2013 CoDeveloper, LLC. All rights reserved.
//

#import"UIWebView+TS_JavaScriptContext.h"

#import<JavaScriptCore/JavaScriptCore.h>
#import<objc/runtime.h>

staticconstcharkTSJavaScriptContext[] = "ts_javaScriptContext";

staticNSHashTable* g_webViews = nil;

@interfaceUIWebView (TS_JavaScriptCore_private)
- (void) ts_didCreateJavaScriptContext:(JSContext *)ts_javaScriptContext;
@end

@protocolTSWebFrame <NSObject>
- (id) parentFrame;
@end

@implementationNSObject (TS_JavaScriptContext)

- (void) webView: (id) unuseddidCreateJavaScriptContext: (JSContext*) ctxforFrame: (id<TSWebFrame>) frame
{
NSParameterAssert( [frame respondsToSelector:@selector( parentFrame )] );

// only interested in root-level frames
if ( [frame respondsToSelector:@selector( parentFrame) ] && [frame parentFrame] != nil )
return;

void (^notifyDidCreateJavaScriptContext)() = ^{

for ( UIWebView* webView in g_webViews )
 {
NSString* cookie = [NSStringstringWithFormat:@"ts_jscWebView_%lud", (unsignedlong)webView.hash ];

 [webView stringByEvaluatingJavaScriptFromString: [NSStringstringWithFormat:@"var %@ = '%@'", cookie, cookie ] ];

if ( [ctx[cookie].toString isEqualToString: cookie] )
 {
 [webView ts_didCreateJavaScriptContext: ctx];
return;
 }
 }
 };

if ( [NSThreadisMainThread] )
 {
notifyDidCreateJavaScriptContext();
 }
else
 {
dispatch_async( dispatch_get_main_queue(), notifyDidCreateJavaScriptContext );
 }
}

@end


@implementationUIWebView (TS_JavaScriptContext)

+ (id) allocWithZone:(struct _NSZone *)zone
{
staticdispatch_once_t onceToken;
dispatch_once(&onceToken, ^{

 g_webViews = [NSHashTableweakObjectsHashTable];
 });

NSAssert( [NSThreadisMainThread], @"uh oh - why aren't we on the main thread?");

id webView = [superallocWithZone: zone];

 [g_webViews addObject: webView];

return webView;
}

- (void) ts_didCreateJavaScriptContext:(JSContext *)ts_javaScriptContext
{
 [selfwillChangeValueForKey:@"ts_javaScriptContext"];

objc_setAssociatedObject( self, kTSJavaScriptContext, ts_javaScriptContext, OBJC_ASSOCIATION_RETAIN);

 [selfdidChangeValueForKey:@"ts_javaScriptContext"];

if ( [self.delegate respondsToSelector:@selector(webView:didCreateJavaScriptContext:)] )
 {
id<TSWebViewDelegate> delegate = ( id<TSWebViewDelegate>)self.delegate;
 [delegate webView:selfdidCreateJavaScriptContext: ts_javaScriptContext];
 }
}

- (JSContext*) ts_javaScriptContext
{
 JSContext* javaScriptContext = objc_getAssociatedObject( self, kTSJavaScriptContext );

return javaScriptContext;
}

@end