SwiftUI Tutorial - Scrumdinger - mysterious AVPlayer initialization syntax

Question

Created May ’22

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I've been following the Scrumdinger tutorial and had close to no trouble understanding the concepts, supplementing myself with the Swift guide.

However, in the state and lifecycle lesson, exactly in the complete project, I've found confusing syntax that I cannot decipher with certainty.

private var player: AVPlayer { AVPlayer.sharedDingPlayer }

What does the closure after the AVPlayer type mean?

sharedDingPlayer is a static property extending AVPlayer, so my guess is that it's either some kind of casting to this exact type or assigning the static prop to the player property when it's available.

I would appreciate any help in clearing this out!

Answered by Claude31 in 713164022

private var player: AVPlayer { AVPlayer.sharedDingPlayer }

This is how a computed var is defined.

It is equivalent to:

private var player: AVPlayer { 
  get {
     return AVPlayer.sharedDingPlayer
   }
}

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Answer 1

Dirk-FU OP

May ’22

I can not find your quoted code private var player: AVPlayer { AVPlayer.sharedDingPlayer } in the Project Files.

Did you mean private var player: AVPlayer = { AVPlayer.sharedDingPlayer }() ?

This initialises the playervariable of Type AVPlayer with the result of the provided closure, which simply returns AVPlayer.sharedDingPlayer while leaving out the not needed return statement.

0

Answer 2

Claude31 OP

May ’22

Accepted Answer

private var player: AVPlayer { AVPlayer.sharedDingPlayer }

This is how a computed var is defined.

It is equivalent to:

private var player: AVPlayer { 
  get {
     return AVPlayer.sharedDingPlayer
   }
}

1