Touch To Record Video

(This is an experimental UI/UX design project for fun). My barebones prototype of a feature similar to Vine's / Instagram's touch to record video. This will allow you to record short clips on touch down, pause upon release, and automatically stitch them all together when complete.

How to Use

Set maximumTimeLimit and run the app. It was written programmatically based on self.view.frame.size.width so it should build for any iPhone. If you don't want square videos, simply modify previewLayer.frame and don't run cropVideo:

Key Learnings and Decisions

• AVCaptureMovieFileOutput is kind of slow, it takes a few ms before it actually begins recording
• Thus, animation of the progress bar is an estimate independent of actual recording progress. I did this for UX reasons, allowing the app to feel more responsive on touch rather than waiting on [MovieFileOutput isRecording] and [MovieFileOutput recordedDuration]
• Because AVCaptureMovieFileOutput is slow, sometimes touches that last less than 0.0500 seconds will not actually record anything. [MovieFileOutput stopRecording] will get called before recording begins. This is bad UX compared to Vine, so perhaps a hack forcing a minimum record duration would be wise. (I haven't written that).
• As a result, videos with many touches will exceed your maximumTimeLimit, but otherwise its roughly accurate.

###Helpful sources I used:
http://www.netwalk.be/article/record-square-video-ios
http://www.raywenderlich.com/13418/how-to-play-record-edit-videos-in-ios
Apologies for improper citations if any.