WTWindowTimers

In iOS 7, Apple introduced the possibility to execute JavaScript via the JavaScriptCore JavaScript engine. Unfortunately, JavaScriptCore is missing some objects and functions a JavaScript environment of a browser would have. Especially the methods described in the WTWindowTimers specification, 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.

Provided functions

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.

How to use it

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.