Timers

Timers are an important part of an application and React Native implements the browser timers.

Timers

• setTimeout and clearTimeout
• setInterval and clearInterval
• setImmediate and clearImmediate
• requestAnimationFrame and cancelAnimationFrame

requestAnimationFrame(fn) is not the same as setTimeout(fn, 0) - the former will fire after all the frames have flushed, whereas the latter will fire as quickly as possible (over 1000x per second on an iPhone 5S).

setImmediate is executed at the end of the current JavaScript execution block, right before sending the batched response back to native. Note that if you call setImmediate within a setImmediate callback, it will be executed right away, it won't yield back to native in between.

The Promise implementation uses setImmediate as its asynchronicity implementation.

note

When debugging on Android, if the times between the debugger and device have drifted; things such as animation, event behavior, etc., might not work properly or the results may not be accurate. Please correct this by running adb shell "date `date +%m%d%H%M%Y.%S%3N`" on your debugger machine. Root access is required for the use in real device.