AVAudioSession setCategory Swift 4.2 iOS 12 - Play Sound on Silent

Her der Töne's comment shows you the new syntax, but you also need to activate the audio session after setCategory:

do {    try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)    try AVAudioSession.sharedInstance().setActive(true)} catch {    print(error)}

As a workaround, you can call the Objective-C AVAudioSession.setCategory: method with the NSObject.performSelector::

if #available(iOS 10.0, *) {    try! AVAudioSession.sharedInstance().setCategory(.playback, mode: .moviePlayback)}else {    // Workaround until https://forums.swift.org/t/using-methods-marked-unavailable-in-swift-4-2/14949 isn't fixed    AVAudioSession.sharedInstance().perform(NSSelectorFromString("setCategory:error:"), with: AVAudioSession.Category.playback)}

If you want to set the category and options for iOS 9 and earlier then use:

AVAudioSession.sharedInstance().perform(NSSelectorFromString("setCategory:withOptions:error:"), with: AVAudioSession.Category.playback, with:  [AVAudioSession.CategoryOptions.duckOthers])

UPDATE:

Issue is fixed in Xcode 10.2.

For Swift 4.2 in iOS 12, it is simply:

try AVAudioSession.sharedInstance().setCategory(.playAndRecord, mode: .default, options: [])