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3.383K

· anthonylevings

In order to use the JavaScriptCore Framework in your iOS app you'll need to add the Framework to your app by navigating to Targets > General > Linked Frameworks and Libraries and adding it in.

Then use #import in the .h file of your view controller to include it: #import <JavaScriptCore/JavaScriptCore.h>

You will then be able to run this code

//
// JSViewController.m
// JavaScriptCore
//
//

#import "JSViewController.h"


@interface JSViewController ()

@end

@implementation JSViewController

- (void)viewDidLoad
{
 [super viewDidLoad];
 // Do any additional setup after loading the view, typically from a nib.

 // Establish path to JSON file
 NSString* path = [[NSBundle mainBundle] pathForResource:@"book"
 ofType:@"json"];
 // Load contents into a string
 NSString* content = [NSString stringWithContentsOfFile:path
 encoding:NSUTF8StringEncoding
 error:NULL];

 // First a context and JS virtual machine is created
 JSContext *context = [[JSContext alloc] initWithVirtualMachine:[[JSVirtualMachine alloc] init]];

 // Next we send the context a function
 [context evaluateScript:@"var valueForKeyTitle = function(json) {var obj = JSON.parse(json); return(obj.Title);}"];

 // Prepare a JSValue to receive the JSON
 JSValue *returnElement = context[@"valueForKeyTitle"];

 // Call the function by sending JSON
 JSValue *resultOfFunction = [returnElement callWithArguments:@[content]];

 // Print result in console
 NSLog(@"Book Title: %@", resultOfFunction); 
}

@end

assuming you have a local json file called book.json in your app with the following contents:

{"Title":"Greatest Book in the World!!", "Length":214}

For further details, see full blogpost.

See also this Big Nerd Ranch post.

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