A concrete UIFeedbackGenerator subclass that creates haptics to communicate successes, failures, and warnings.
Use notification feedback to communicate that a task or action has succeeded, failed, or produced a warning of some kind.
Step 1: Check if the device supports haptic feedback
print(UIDevice.current.value(forKey: "_feedbackSupportLevel"))
// 0 = Taptic not available
// 1 = First generation (tested on an iPhone 6s) ... which does NOT support UINotificationFeedbackGenerator, etc.
// 2 = Second generation (tested on an iPhone 7) ... which does support it.
Step 2: open system
Settings / Sound & Haptics / System Haptics
Step 3: Code
struct ContentView: View {
let generator = UINotificationFeedbackGenerator()
var body: some View {
VStack(alignment: .center, spacing: 30.0) {
Button(action: {
self.generator.notificationOccurred(.success)
}) {
Text("Notification - Success")
}
Button(action: {
self.generator.notificationOccurred(.error)
}) {
Text("Notification - Error")
}
Button(action: {
self.generator.notificationOccurred(.warning)
}) {
Text("Notification - Warning")
}
Button(action: {
let impactLight = UIImpactFeedbackGenerator(style: .light)
impactLight.impactOccurred()
}) {
Text("Impact - Light")
}
Button(action: {
let impactMed = UIImpactFeedbackGenerator(style: .medium)
impactMed.impactOccurred()
}) {
Text("Impact - Medium")
}
Button(action: {
let impactHeavy = UIImpactFeedbackGenerator(style: .heavy)
impactHeavy.impactOccurred()
}) {
Text("Impact - Heavy")
}
Button(action: {
let selectionFeedback = UISelectionFeedbackGenerator()
selectionFeedback.selectionChanged()
}) {
Text("Selection Feedback - Changed")
}
}
.padding(.all, 30.0)
}
}