如何检测接近传感器？

Question

如何检测用户是否听到此音频？

Answer 1

首先使用iPhone Proximity Sensor检测接近传感器的状态 然后使用电话扬声器Play audio through upper (phone call) speaker

播放音频

Answer 2

[[UIDevice currentDevice] setProximityMonitoringEnabled:YES]
[[NSNotificationCenter defaultCenter] addObserver:self
    selector:@selector(sensorStateChange:)
    name:@"UIDeviceProximityStateDidChangeNotification" object:nil];