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Swift Meetup SP
Heurísticas e Swift: Do
“NSProcessInfo” a um shake no
Apple Watch
Ezequiel França
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Mecatrônica @ SENAI
Automação Industrial @ IFSP
Analise de Sistemas @ FIAP
Desenvolvedor iOS, Maker e open-source
hacker.
Ezequiel França
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https://www.youtube.com/watch?v=BoeRfMBVCGo
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Swift
Meetup SP
❤
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Heurísticas?
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http://mathwiki.cs.ut.ee/asymptotics/05_polynomial_complexity
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Let’s Shake
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http://indiatoday.intoday.in/technology/story/apple-watch-
handshakes-nfc-gestures/1/448093.html
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lembrando
rapidinho
de
protocolos
delegates
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protocol SomeProtocol {
func someTypeMethod()
}
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protocol SomeProtocol {
func someTypeMethod()
}
class SomeClass: SomeProtocol{
}
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protocol WatchShakerDelegate
{
func watchShakerDidShake(_ watchShaker: WatchShaker)
func watchShaker(_ watchShaker:WatchShaker, didFailWith error:
Error)
}
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protocol WatchShakerDelegate
{
func didShake()
func didFail(error: Error)
}
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protocol WatchShakerDelegate
{
func watchShakerDidShake(_ watchShaker: WatchShaker)
func watchShaker(_ watchShaker:WatchShaker, didFailWith error:
Error)
}
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class WatchShaker
{
public var delegate: WatchShakerDelegate?
fileprivate var motionManager: CMMotionManager!
fileprivate var lastShakeDate: Date?
!// The threshold for how much acceleration needs
to happen before an event will register.
fileprivate var threshold:Double
!// Time between shakes
fileprivate var delay:Double = 0.1
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init(shakeSensibility to:ShakeSensibility, delay time:Double)
{
self.threshold = to.rawValue
self.delay = time
self.motionManager = CMMotionManager()
}
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ShakeSensibility
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enum ShakeSensibility: Double {
case shakeSensibilitySoftest = 0.1
case shakeSensibilitySoft = 0.7
case shakeSensibilityNormal = 1.0
case shakeSensibilityHard = 1.2
case shakeSensibilityHardest = 2.0
}
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public func start(delay accelerometerUpdateInterval:Double = 0.02)
{
guard motionManager.isAccelerometerAvailable else { return }
motionManager.accelerometerUpdateInterval = accelerometerUpdateInterval
let motionQueue = OperationQueue()
motionManager.startAccelerometerUpdates(to: motionQueue)
{ (accelerometerData, err) -> Void in
guard err == nil else
{
self.delegate?.watchShaker(self, didFailWith: err!)
return
}
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guard let data = accelerometerData else {
let e = NSError(domain: "No accelerometer data", code: 666,
userInfo: ["No accelerometer data":"info"])
self.delegate?.watchShaker(self, didFailWith: e)
return
}
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let valueX = fabs(data.acceleration.x)
let valueY = fabs(data.acceleration.y)
let maxValue = valueX > valueY ? valueX : valueY
if maxValue > self.threshold
{
if let lastDate = self.lastShakeDate
{
if Date().compare(lastDate.addingTimeInterval(self.delay))
!== .orderedDescending
{
self.lastShakeDate = Date()
self.delegate!?.watchShakerDidShake(self)
}
return
}
self.lastShakeDate = Date()
self.delegate!?.watchShakerDidShake(self)
}
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:)
@ezefranca
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3 vouchers para o curso
de SpriteKit
(100% em Swift ❤)