如何在iOS设备上启用振动功能
本文将指导您如何在iOS设备上调整声音设置，将振动功能从关闭状态更改为开启状态，以便在接收通知时感受到设备震动。
1.Add the AudioToolbox framework to your target.
2. In the file you intend to trigger a vibration, import the AudioToolbox header file:
#import <AudioToolbox/AudioToolbox.h>
3. Finally, call the following line to make the device vibrate:
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
needed to change an iphone setting .
For sounds , had vibrate turned off.
change vibrate to ON under sounds
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