Select the most proper answer. import UIKit import AVFoundation … … … let r:AVAudioRecorder? do { r = try AVAudioRecorder(URL: soundFileURL, settings: rSettings) r.delegate = self r.meteringEnabled = true r.prepareToRecord() } catch let error as NSError { r = nil print(error.localizedDescription) }

When the following code is executed, what it will do? funcfunc() { let layer = UIApplication.sharedApplication().keyWindow!.layer let scale = UIScreen.mainScreen().scale UIGraphicsBeginImageContextWithOptions(layer.frame.size, false, scale); layer.renderInContext(UIGraphicsGetCurrentContext()!) let s = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsEndImageContext() UIImageWriteToSavedPhotosAlbum(s, nil, nil, nil) }

In Swift, what are the benefits of classes?

Which statements are true about Tuple?

How to extract a string from URL data?

Correct answer for Enumerations?

What is the type of Swift Enumerations?

What is the most basic difference between Value and Reference types?

What happens when Swifts String, Array, and Dictionary objects are assigned to a new constant or variable?

Which of these collection types is not included by default in standard Swift?

Which of these statements declares cityArray as a mutable array?