JavaScriptCore framework on iOS/OSX is missing some things from browser object model you get used to - setTimeout, XMLHttpRequest, etc. Also a lot of libraries requires to have such objects, for example rx.js requires to have setTimeout.

This projects extends JSContext with native implementation of some functions of BOM using Objective-C

How to use it?

Using cocoapods: pod 'JSCoreBom', '~> 1.1'.

Whenever you would like to extend JSContext with BOM function just use:

JSContext* context = [[JSContext alloc] init];
[[JSCoreBom shared] extendContext:context];

Then just use it:

[context evaluateScript:@"setTimeout(function(){ console.log('Hi in 5 seconds!')},5000"];

What does it contain?

Name	Description	Status
setTimeout	Implemented using dispatch_after	Done
console.{info,log,debug,warn,error}	Would forward everything to NSLog	Done
XmlHTTPRequest	Using NSUrlSession	Proto done

For logger you can specify custom log handler:

[[JSCoreBom shared] extend:context logHandler:^(NSString* logLevel, NSArray* params, NSString* formattedLogEntry) {
    if ([logLevel isEqualToString: @"log"])
        [MyCustomLogger log:logEntry];
}];

How does it work?

Like Apple on a page 45 said to!

JSContext* context = [[JSContext alloc] init];
context[@"setTimeout"] = ^(JSValue* function, JSValue* timeout) {
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)([timeout toInt32] * NSEC_PER_MSEC)), dispatch_get_main_queue(), ^{
        [function callWithArguments:@[]];
    });
};

Known issues

XMLHttpRequest:

• Always sync call is made using NSURLConnection, not NSUrlSession yet