是否可以使用麦克风在模拟器上录制实际声音

Question

Is it possible record the actual sound on the simulator using the mic.
I have created the recorder which record the sound in simulator but not recording the actual audio its just null(empty) audio.

Answer 1

iOS Simulator does not support audio recording, you should use real device to test.

Here you can read about Limitations of Testing in iOS Simulator

Hardware Limitations While most of the functionality of iOS devices can be simulated in iOS Simulator, there are some hardware features that must be tested directly on a device. The hardware features that cannot be simulated are:

Accelerometer

Gyroscope
Camera
Proximity Sensor

Microphone Input

Answer 2

The old answer for this question is now incorrect; the iOS Simulator now supports audio input/recording.

Pic below related: where you set your audio input device (defaults to your system default)

Also be warned, some online Apple dev docs still say audio input is unsupported by the simulator ("as of 8.2") even though it is with newer versions...

Edit: Screenshot from OS X 10.12 (Sierra), Xcode 9.1 (function is also available in later Xcode 8, > 8.2)