Catch errors when starting audio session on iOS

Author: Rexios80

packages/audio_streamer/ios/Classes/SwiftAudioStreamerPlugin.swift

@@ -65,21 +65,24 @@ public class SwiftAudioStreamerPlugin: NSObject, FlutterPlugin, FlutterStreamHan
 
     func startRecording() {
         engine = AVAudioEngine()
-      
-        try! AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playAndRecord, options: .mixWithOthers)
-        try! AVAudioSession.sharedInstance().setActive(true)
-      
-        let input = engine.inputNode
-        let bus = 0
 
-        input.installTap(onBus: bus, bufferSize: 22050, format: input.inputFormat(forBus: bus)) { (buffer, time) -> Void in
-            let samples = buffer.floatChannelData?[0]
-            // audio callback, samples in samples[0]...samples[buffer.frameLength-1]
-            let arr = Array(UnsafeBufferPointer(start: samples, count: Int(buffer.frameLength)))
-            self.emitValues(values: arr)
-        }
+        do {
+            try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playAndRecord, options: .mixWithOthers)
+            try AVAudioSession.sharedInstance().setActive(true)
 
-        try! engine.start()
-    }
+            let input = engine.inputNode
+            let bus = 0
+
+            input.installTap(onBus: bus, bufferSize: 22050, format: input.inputFormat(forBus: bus)) { buffer, _ -> Void in
+                let samples = buffer.floatChannelData?[0]
+                // audio callback, samples in samples[0]...samples[buffer.frameLength-1]
+                let arr = Array(UnsafeBufferPointer(start: samples, count: Int(buffer.frameLength)))
+                self.emitValues(values: arr)
+            }
 
+            try engine.start()
+        } catch {
+            eventSink!(FlutterError(code: "100", message: "Unable to start audio session", details: error.localizedDescription))
+        }
+    }
 }