In iOS 7, Apple introduced the possibility to [execute JavaScript via the JavaScriptCore JavaScript
engine] (http://nshipster.com/javascriptcore/). Unfortunately, JavaScriptCore is missing some
objects and functions a JavaScript environment of a browser would have. Especially the methods
described in the [WTWindowTimers specification]
(https://html.spec.whatwg.org/multipage/webappapis.html#windowtimers), such as setTimeout or
setInterval are not provided. This library implements those methods, so it is possible to use
JavaScript libraries which were originally developed for in-browser use in your Objective-C
(or Swift) application without the need to use a hidden WebView.
This library tries to implement the full specification fo the Window Timers, including passing a
string as first argument to setTimeout or setInterval or passing additional arguments to both
mentioned functions.
Create a new instance of the WTWindowTimers class. Then call the extend: method and pass either
a JSContext instance or a JSValue instance. The given object will be extend with the functions.
#import <WindowTimers/WindowTimers.h>
...
JSContext *jsContext = [JSContext new];
WTWindowTimers *timers = [WTWindowTimers new];
[timers extend:jsContext];
// Now jsContext has the additional functions setTimeout, clearTimeout, setInterval, clearInterval
jsContext[@"callCounter"] = @0;
[jsContext evaluateScript:@"setTimeout(function(){callCounter += 1;}, 1000);"];
// Run the main loop for at least 1.1 seconds so we make sure that the callback is executed.
[[NSRunLoop mainRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.2]];
NSLog(@"callCounter is %@", jsContext[@"callCounter"]); // Will log 1.