SwiftOptionalBindingProblem
Demo app illustrate problem with Swift optional binding.
Environment
- MacBook Pro, 13 inch, late 2013, with macOS 10.12.4
- iPhone 7 with iOS 10.3.1
- Xcode 8.3.2, Swift 3.1
How to reproduce:
- build and run it will succeed to export a new audiovisual.
- uncomment the commented statements in ViewController.swift and comment statements below them:
// if let audio = audioUrl {
// let reversedAudioAsset = AVURLAsset(url: audio)
// reversedAudioAssetTrack = reversedAudioAsset.tracks(withMediaType: AVMediaTypeAudio).first
//}
let reversedAudioAsset = AVURLAsset(url: audioUrl!)
reversedAudioAssetTrack = reversedAudioAsset.tracks(withMediaType: AVMediaTypeAudio).first
// if let video = videoUrl {
// let reversedVideoAsset = AVURLAsset(url: video)
// reversedVideoAssetTrack = reversedVideoAsset.tracks(withMediaType: AVMediaTypeVideo).first
// }
let reversedVideoAsset = AVURLAsset(url: videoUrl!)
reversedVideoAssetTrack = reversedVideoAsset.tracks(withMediaType: AVMediaTypeVideo).first
- build and run, the error catched.