Any possible ways to use my iPhone presence in wifi network as a trigger?

Question

My goal is to record the time when I am out/arrive home, and certain calendar event. I know how to do everything except finding out the triggers that will indicate that I am at home.

Alternative #1 I think using my iPhone presence in my Wifi network is one of the best alternative that came to my mind. But I don't know any possible ways how I can achieve it through iOS, or osx.

Alternative #2 I also was thinking about using IFTTT on iPhone (Locator + Google Calendar), but it will decrease battery usage.

Do you know how to achieve wifi detection of my phone. Or maybe there are other ideas what could be used as a trigger?

Answer 1

Haven't looked into this much yet, but instead of running IFTTT on your phone, you can now have it on your (Google) router:

http://thenextweb.com/gadgets/2016/04/28/googles-onhub-router-ifttt/

Answer 2

iOS has built in support for geofence-based regions, which use a mixture of GPS, WiFi, accelerometer, and other sensors. An OS based geofence will even launch your program in order to notify it that you have entered/exited the region. It's also designed to be power-efficient. Take a look at the location manager and CLCircularRegion .