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whats up everybody welcome back to another video and iOS interview questions today is going to be part two about communication patterns now part one was all about delegates and protocols part two is going to be about notifications and observers if you havent seen part one on delegates and protocols I recommend going back and watching that I talk about a lot of the basics of communication patterns because today were just going to build off that and talk about notifications and observers so at a high level what notifications and observers are it takes two parts you have the observer and then the notification so the observer just sitting somewhere in your code waiting to hear this notification and then you put this notification wherever you want the event to happen whether its in viewdidload of a screen or whatever so that event happens it fires off the message and this observer just waiting to hear that message and then once it hears that message it executes whatever code you want i