ios - How do I detect my iPhone tilting upwards? -


i'm trying print statement when coremotion detects when iphone tilts upwards. can't seem figure out how make work. have right now: 

if manager.isdevicemotionavailable { manager.devicemotionupdateinterval = 0.01 manager.startdevicemotionupdates(to: queue) {     [weak self] (data: cmdevicemotion?, error: error?) in     print("tilted!!")     }   } }

tilted!! not being printed don't know if there's wrong code when tilt phone , it's not working. thanks!


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