if currentPoint.x <= imageWidth /
2 { currentPoint.x = imageWidth /
2 ballXVelocity = -
ballXVelocity *
0.
8 }
if currentPoint.x >=
bounds.size.width - imageWidth /
2 { currentPoint.x =
bounds.size.width - imageWidth /
2 ballXVelocity = -
ballXVelocity *
0.
8 }
3.2.2 開啟陀螺儀并更新
manager.deviceMotionUpdateInterval = 1 / 60 manager.startDeviceMotionUpdates(to: OperationQueue.main) { (motion, error) in self.ballView!.accelleration = (motion?.gravity)! DispatchQueue.main.async { self.ballView!.updateLocation(multiplier: 5000) }
3.2.3 更新小球的位置
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