// 只扩展到底部
.ignoresSafeArea(edges: .bottom)

// 扩展到顶部和底部
.ignoresSafeArea(edges: [.bottom, .trailing])

// 横向扩展
.ignoresSafeArea(edges:.horizontal)

// 为了能让CoreData能够自己解析编码[Tag]，首先上面的Tag需要先conform to：NSSexureCoding和NSObject
class TagAttributeTransformer: NSSecureUnarchiveFromDataTransformer {
    override static var allowedTopLevelClasses: [AnyClass] {
        [Tag.self]
    }
    
    static func register() {
        let className = String(describing: TagAttributeTransformer.self)
        let name = NSValueTransformerName(className)
        let transformer = TagAttributeTransformer()
        
        ValueTransformer.setValueTransformer(transformer, forName: name)
    }
}

switch i {
  case 1:
  let generator = UINotificationFeedbackGenerator()
  generator.notificationOccurred(.error)

  case 2:
  let generator = UINotificationFeedbackGenerator()
  generator.notificationOccurred(.success)

  case 3:
  let generator = UINotificationFeedbackGenerator()
  generator.notificationOccurred(.warning)

  case 4:
  let generator = UIImpactFeedbackGenerator(style: .light)
  generator.impactOccurred()

  case 5:
  let generator = UIImpactFeedbackGenerator(style: .medium)
  generator.impactOccurred()

  case 6:
  let generator = UIImpactFeedbackGenerator(style: .heavy)
  generator.impactOccurred()

  default:
  let generator = UISelectionFeedbackGenerator()
  generator.selectionChanged()
  i = 0
}

import CoreHaptics

func complexSuccess() {
    // make sure that the device supports haptics
    guard CHHapticEngine.capabilitiesForHardware().supportsHaptics else { return }
    var events = [CHHapticEvent]()

    // create one intense, sharp tap
    let intensity = CHHapticEventParameter(parameterID: .hapticIntensity, value: 1)
    let sharpness = CHHapticEventParameter(parameterID: .hapticSharpness, value: 1)
    let event = CHHapticEvent(eventType: .hapticTransient, parameters: [intensity, sharpness], relativeTime: 0)
    events.append(event)

    // convert those events into a pattern and play it immediately
    do {
        let pattern = try CHHapticPattern(events: events, parameters: [])
        let player = try engine?.makePlayer(with: pattern)
        try player?.start(atTime: 0)
    } catch {
        print("Failed to play pattern: \(error.localizedDescription).")
    }
}