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

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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?

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?

• javascript
• objective-c
• webkit
• objective-c-blocks
• javascriptcore

Share Improve this question Follow edited Oct 17, 2013 at 10:08 Jorge Cohen asked Oct 17, 2013 at 9:52 Jorge CohenJorge Cohen 1,5221010 silver badges3434 bronze badges 1

• 1 The answer with 7 upvotes should be accepted as correct answer – prabodhprakash Commented Dec 18, 2016 at 20:45

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 8

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);} )"];

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

http://trac.webkit/changeset/144489

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