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JavaScriptCore: Trying to pass JS function as block to Objective-C, Getting 'TypeError' Exception

I've been playing around with the new iOS 7/Mavericks JavascriptCore bridge, trying to get JS functions on Objective-C as blocks.

The JavascriptCore header files states that this is possible as long as every argument is supported, but trying this:

JSContext *context = [[JSContext alloc] init];

context[@"Log"] = ^(NSString *message){NSLog(@"%@", message);};

context[@"BlockTest"] = ^(void (^blockTest)(NSString* blockString)){
    NSLog(@"Calling Block Test");
    blockTest(@"STRINGGGGG");
};

[context evaluateScript:@"BlockTest( function(dataString){Log('JS '+dataString);} )"];

raises the following JS exception:

TypeError: '[object NSBlock]' is not a function (evaluating 'BlockTest( function(dataString){Log('JS '+dataString);} )')

Any ideas on what's wrong with my test code?

like image 879
Jorge Cohen Avatar asked Sep 01 '25 09:09

Jorge Cohen


2 Answers

I know that you've accepted the answer that support for this was removed (and that this is an old question), but you can pass a JS function as a block to Objective-C in the JavaScriptCore framework introduced with iOS7/Mavericks - your code just needs to change slightly how you declare and invoke the block:

JSContext *context = [[JSContext alloc] init];

context[@"Log"] = ^(NSString *message){NSLog(@"%@", message);};

context[@"BlockTest"] = ^(JSValue *blockTest){
    NSLog(@"Calling Block Test");
    [blockTest callWithArguments:@[@"STRINGGGGG"]];
};

[context evaluateScript:@"BlockTest( function(dataString){Log('JS '+dataString);} )"];
like image 139
Mike Avatar answered Sep 03 '25 21:09

Mike


Seems like support for this was removed and documentation not updated:

http://trac.webkit.org/changeset/144489

like image 41
Jorge Cohen Avatar answered Sep 03 '25 23:09

Jorge Cohen