denilsonsa

Embed VTT subtitles into HTML

Objective

I have a video file on my local disk. I also have some subtitles (in HTML5's [WebVTT][] format).

I want to create an HTML file to play that video with subtitles, all from the local filesystem.

Problem

boherna

The proper way to fade a UILabel (or any UIView for that matter) is to use a Core Animation Transition. This will not flicker, nor will it fade to black if the content is unchanged.

A portable and clean solution is to use a Extension in Swift (invoke prior changing visible elements)

// Usage: insert view.fadeTransition right before changing content
extension UIView {
    func fadeTransition(duration:CFTimeInterval) {
        let animation:CATransition = CATransition()
        animation.timingFunction = CAMediaTimingFunction(name:
            kCAMediaTimingFunctionEaseInEaseOut)