在 SwiftUI 中检测 Siri 远程滑动
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【中文标题】在 SwiftUI 中检测 Siri 远程滑动【英文标题】：Detect Siri Remote swipe in SwiftUI 【发布时间】：2019-12-09 13:49:53 【问题描述】：如何从 SwiftUI 识别 Siri Remote 滑动手势。
我好像还没有实现，那我该如何解决呢？
【问题讨论】：
【参考方案1】：另一种（更可靠但更老套）的方法是使用 GameController 低级 x/y 值进行 dPad 控制，
Siri 遥控器也被认为是一个游戏控制器，它是第一个连接到苹果电视的游戏控制器，
所以在出现 SwiftUI 视图时，您可以执行以下操作：
import SwiftUI
import GameController
struct SwipeTestView: View
var body: some View
Text("This can be some full screen image or what not")
.onAppear(perform:
let gcController = GCController.controllers().first
let microGamepad = gcController!.microGamepad
microGamepad!.reportsAbsoluteDpadValues = true
microGamepad!.dpad.valueChangedHandler = pad, x, y in
let fingerDistanceFromSiriRemoteCenter: Float = 0.7
let swipeValues: String = "x: \(x), y: \(y), pad.left: \(pad.left), pad.right: \(pad.right), pad.down: \(pad.down), pad.up: \(pad.up), pad.xAxis: \(pad.xAxis), pad.yAxis: \(pad.yAxis)"
if y > fingerDistanceFromSiriRemoteCenter
print(">>> up \(swipeValues)")
else if y < -fingerDistanceFromSiriRemoteCenter
print(">>> down \(swipeValues)")
else if x < -fingerDistanceFromSiriRemoteCenter
print(">>> left \(swipeValues)")
else if x > fingerDistanceFromSiriRemoteCenter
print(">>> right \(swipeValues)")
else
//print(">>> tap \(swipeValues)")
)
.focusable() // <-- this is required only if you want to capture 'press' and 'LongPress'
.onLongPressGesture(minimumDuration: 1, perform: // on press action
print(">>> Long press")
)
.onLongPressGesture(minimumDuration: 0.01, perform: // on press action
print(">>> press")
)
这是一个更可靠的解决方案，并且每次都有效，您只需将手指从 Siri 遥控器的中心向外滑动到您想要的滑动方向（上/下/左/右），
您也可以实现这种方式上+左、上+右、下+左、下+右、顺时针循环滑动或逆时针循环以及任何你想要的。
您甚至可能能够使用simultaneousGesture()实现放大手势等操作
注意：[12.SEP.2021] 如果您打算在模拟器上运行此代码，请知道目前模拟器尚不支持将控制器作为 GameController 并且行：GCController.controllers().first 将返回 nil，您需要一个真正的硬件来尝试它，see this answer
我在此基础上编写了几个扩展并进行了测试（tvOS 14.7），这是一个可以用作 tvOS 的 SwipeGesture 的扩展：
import SwiftUI
import GameController
// MARK: - View+swipeGestures
struct SwipeGestureActions: ViewModifier
// swipeDistance is how much x/y values needs to be acumelated by a gesture in order to consider a swipe (the distance the finger must travel)
let swipeDistance: Float = 0.7
// how much pause in milliseconds should be between gestures in order for a gesture to be considered a new gesture and not a remenat x/y values from the previous gesture
let secondsBetweenInteractions: Double = 0.2
// the closures to execute when up/down/left/right gesture are detected
var onUp: () -> Void =
var onDown: () -> Void =
var onRight: () -> Void =
var onLeft: () -> Void =
@State var lastY: Float = 0
@State var lastX: Float = 0
@State var totalYSwipeDistance: Float = 0
@State var totalXSwipeDistance: Float = 0
@State var lastInteractionTimeInterval: TimeInterval = Date().timeIntervalSince1970
@State var isNewSwipe: Bool = true
func resetCounters(x: Float, y: Float)
isNewSwipe = true
lastY = y // start counting from the y point the finger is touching
totalYSwipeDistance = 0
lastX = x // start counting from the x point the finger is touching
totalXSwipeDistance = 0
func body(content: Content) -> some View
content
.onAppear(perform:
let gcController = GCController.controllers().first
let microGamepad = gcController!.microGamepad
microGamepad!.reportsAbsoluteDpadValues = false // assumes the location where the user first touches the pad is the origin value (0.0,0.0)
let currentHandler = microGamepad!.dpad.valueChangedHandler
microGamepad!.dpad.valueChangedHandler = pad, x, y in
// if there is already a hendler set - execute it as well
if currentHandler != nil
currentHandler!(pad, x, y)
/* check how much time passed since the last interaction on the siri remote,
* if enough time has passed - reset counters and consider these coming values as a new gesture values
*/
let nowTimestamp = Date().timeIntervalSince1970
let elapsedNanoSinceLastInteraction = nowTimestamp - lastInteractionTimeInterval
lastInteractionTimeInterval = nowTimestamp // update the last interaction interval
if elapsedNanoSinceLastInteraction > secondsBetweenInteractions
resetCounters(x: x, y: y)
/* accumelate the Y axis swipe travel distance */
let currentYSwipeDistance = y - lastY
lastY = y
totalYSwipeDistance = totalYSwipeDistance + currentYSwipeDistance
/* accumelate the X axis swipe travel distance */
let currentXSwipeDistance = x - lastX
lastX = x
totalXSwipeDistance = totalXSwipeDistance + currentXSwipeDistance
// print("y: \(y), x: \(x), totalY: \(totalYSwipeDistance) totalX: \(totalXSwipeDistance)")
/* check if swipe travel goal has been reached in one of the directions (up/down/left/right)
* as long as it is consedered a new swipe (and not a swipe that was already detected and executed
* and waiting for a few milliseconds stop between interactions)
*/
if (isNewSwipe)
if totalYSwipeDistance > swipeDistance && totalYSwipeDistance > 0 // swipe up detected
isNewSwipe = false // lock so next values will be disregarded until a few milliseconds of 'remote silence' achieved
onUp() // execute the appropriate closure for this detected swipe
else if totalYSwipeDistance < -swipeDistance && totalYSwipeDistance < 0 // swipe down detected
isNewSwipe = false
onDown()
else if totalXSwipeDistance > swipeDistance && totalXSwipeDistance > 0 // swipe right detected
isNewSwipe = false
onRight()
else if totalXSwipeDistance < -swipeDistance && totalXSwipeDistance < 0 // swipe left detected
isNewSwipe = false
onLeft()
else
//print(">>> tap")
)
extension View
func swipeGestures(onUp: @escaping () -> Void = ,
onDown: @escaping () -> Void = ,
onRight: @escaping () -> Void = ,
onLeft: @escaping () -> Void = ) -> some View
self.modifier(SwipeGestureActions(onUp: onUp,
onDown: onDown,
onRight: onRight,
onLeft: onLeft))
你可以这样使用它：
struct TVOSSwipeTestView: View
@State var markerX: CGFloat = UIScreen.main.nativeBounds.size.width / 2
@State var markerY: CGFloat = UIScreen.main.nativeBounds.size.height / 2
var body: some View
VStack
Circle()
.stroke(Color.white, lineWidth: 5)
.frame(width: 40, height: 40)
.position(x: markerX, y: markerY)
.animation(.easeInOut(duration: 0.5), value: markerX)
.animation(.easeInOut(duration: 0.5), value: markerY)
.background(Color.blue)
.ignoresSafeArea(.all)
.edgesIgnoringSafeArea(.all)
.swipeGestures(onUp:
print("onUp()")
markerY = markerY - 40
,
onDown:
print("onDown()")
markerY = markerY + 40
,
onRight:
print("onRight()")
markerX = markerX + 40
,
onLeft:
print("onLeft()")
markerX = markerX - 40
)
.focusable() // <-- this is required only if you want to capture 'press' and 'LongPress'
.onLongPressGesture(minimumDuration: 1, perform: // on press action
print(">>> Long press")
)
.onLongPressGesture(minimumDuration: 0.01, perform: // on press action go to middle of the screen
markerX = UIScreen.main.nativeBounds.size.width / 2
markerY = UIScreen.main.nativeBounds.size.height / 2
)
【讨论】：
【参考方案2】：这个问题我有2个答案，我会分别回答，让你们决定哪个最好，
首先是苹果方式（显然并非始终有效，捕获的点击次数比滑动次数多）：
import SwiftUI
struct SwipeTestView: View
var body: some View
Text("This can be some full screen image or what not")
.focusable() // <-- this is a must
.onMoveCommand direction in // <-- this $#!* can't tell a move swipe from a touch (direction is of type: MoveCommandDirection)
print("Direction: \(direction)")
if direction == .left print(">>> left swipe detected")
if direction == .right print(">>> right swipe detected")
if direction == .up print(">>> up swipe detected")
if direction == .down print(">>> down swipe detected")
你真的（我怎么强调都不为过）必须在 Siri 遥控器或 iPhone Siri 遥控器的最边缘滑动，
所以尝试在这些黄色区域上滑动，尽量不要用手指轻敲然后滑动，而是轻轻向外滑动，让手指完全脱离远程边缘
预期结果：
在成功捕获滑动之前我确实尝试了 100 多次（显然不是用于生产的东西），希望 tvOS 15 及更高版本能够解决此问题
【讨论】：
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