在 swiftUI 中存在
.keyboardShortcut()// run "doSomeAction()" on press of "b" key on the keyboard
Button("SomeBtn") { doSomeAction() }
.keyboardShortcut("b", modifiers: [])
但是要使用此修饰符，您需要有一个按钮实例。
问题是——是否可以应用一些修改器而不创建任何无用的视图？
如果我需要为某些键盘按键分配 20 个操作怎么办？
我是否需要创建 20 个按钮并使其不可见，即使这确实对性能不利？
请看另一个答案。比这个好多了。 这只是为了历史而保存的:)
该解决方案的利润：
.keyboardShortcut().keyboardShortcut()缺点：
解决方案示例：
struct WindowView: View {
@ObservedObject var model: WindowModel
var body: some View {
Text("some text")
.padding(60)
// THIS IS FINAL SOLUTION
.addCustomHotkeys(model.hotkeys)
// THIS IS FINAL SOLUTION
}
}
ViewModel 内的热键初始化：
// THIS IS FINAL SOLUTION
let hotkeys: [HotkeyCombination] = [
HotkeyCombination(keyBase: [], key: .kVK_ANSI_Q) { print("Q") },
HotkeyCombination(keyBase: [.option], key: .kVK_ANSI_Q) { print("Option+Q") }
]
使用我的解决方案的文件：
HotKeys.swift：
import Foundation
import SwiftUI
import Combine
@available(OSX 11.0, *)
extension View {
func addCustomHotkeys( _ hotkeys: [HotkeyCombination] ) -> some View {
self.modifier(HotKeysMod(hotkeys))
}
}
@available(OSX 11.0, *)
public struct HotKeysMod: ViewModifier {
@State var subs = Set<AnyCancellable>() // Cancel onDisappear
var hotkeys: [HotkeyCombination]
init(_ hotkeys: [HotkeyCombination] ) {
self.hotkeys = hotkeys
}
public func body(content: Content) -> some View {
ZStack {
DisableSoundsView(hotkeys:hotkeys)
content
}
}
}
struct DisableSoundsView: NSViewRepresentable {
var hotkeys: [HotkeyCombination]
func makeNSView(context: Context) -> NSView {
let view = DisableSoundsNSView()
view.hotkeys = hotkeys
return view
}
func updateNSView(_ nsView: NSView, context: Context) { }
}
class DisableSoundsNSView: NSView {
var hotkeys: [HotkeyCombination] = []
override func performKeyEquivalent(with event: NSEvent) -> Bool {
return hotkeysSubscription(combinations: hotkeys)
}
}
fileprivate func hotkeysSubscription(combinations: [HotkeyCombination]) -> Bool {
for comb in combinations {
let basePressedCorrectly = comb.keyBasePressed
if basePressedCorrectly && comb.key.isPressed {
comb.action()
return true
}
}
return false
}
///////////////////////
///HELPERS
///////////////////////
struct HotkeyCombination {
let keyBase: [KeyBase]
let key: CGKeyCode
let action: () -> ()
}
extension HotkeyCombination {
var keyBasePressed: Bool {
let mustBePressed = KeyBase.allCases.filter{ keyBase.contains($0) }
let mustBeNotPressed = KeyBase.allCases.filter{ !keyBase.contains($0) }
for base in mustBePressed {
if !base.isPressed {
return false
}
}
for base in mustBeNotPressed {
if base.isPressed {
return false
}
}
return true
}
}
enum KeyBase: CaseIterable {
case option
case command
case shift
case control
var isPressed: Bool {
switch self {
case .option:
return CGKeyCode.kVK_Option.isPressed || CGKeyCode.kVK_RightOption.isPressed
case .command:
return CGKeyCode.kVK_Command.isPressed || CGKeyCode.kVK_RightCommand.isPressed
case .shift:
return CGKeyCode.kVK_Shift.isPressed || CGKeyCode.kVK_RightShift.isPressed
case .control:
return CGKeyCode.kVK_Control.isPressed || CGKeyCode.kVK_RightControl.isPressed
}
}
}
CGKeyCode 扩展取自：
https://gist.github.com/chipjarred/cbb324c797aec865918a8045c4b51d14
CGKeyCode.swift：
import Foundation
///https://gist.github.com/chipjarred/cbb324c797aec865918a8045c4b51d14
extension CGKeyCode {
static let kVK_ANSI_A : CGKeyCode = 0x00
static let kVK_ANSI_S : CGKeyCode = 0x01
static let kVK_ANSI_D : CGKeyCode = 0x02
static let kVK_ANSI_F : CGKeyCode = 0x03
static let kVK_ANSI_H : CGKeyCode = 0x04
static let kVK_ANSI_G : CGKeyCode = 0x05
static let kVK_ANSI_Z : CGKeyCode = 0x06
static let kVK_ANSI_X : CGKeyCode = 0x07
static let kVK_ANSI_C : CGKeyCode = 0x08
static let kVK_ANSI_V : CGKeyCode = 0x09
static let kVK_ANSI_B : CGKeyCode = 0x0B
static let kVK_ANSI_Q : CGKeyCode = 0x0C
static let kVK_ANSI_W : CGKeyCode = 0x0D
static let kVK_ANSI_E : CGKeyCode = 0x0E
static let kVK_ANSI_R : CGKeyCode = 0x0F
static let kVK_ANSI_Y : CGKeyCode = 0x10
static let kVK_ANSI_T : CGKeyCode = 0x11
static let kVK_ANSI_1 : CGKeyCode = 0x12
static let kVK_ANSI_2 : CGKeyCode = 0x13
static let kVK_ANSI_3 : CGKeyCode = 0x14
static let kVK_ANSI_4 : CGKeyCode = 0x15
static let kVK_ANSI_6 : CGKeyCode = 0x16
static let kVK_ANSI_5 : CGKeyCode = 0x17
static let kVK_ANSI_Equal : CGKeyCode = 0x18
static let kVK_ANSI_9 : CGKeyCode = 0x19
static let kVK_ANSI_7 : CGKeyCode = 0x1A
static let kVK_ANSI_Minus : CGKeyCode = 0x1B
static let kVK_ANSI_8 : CGKeyCode = 0x1C
static let kVK_ANSI_0 : CGKeyCode = 0x1D
static let kVK_ANSI_RightBracket : CGKeyCode = 0x1E
static let kVK_ANSI_O : CGKeyCode = 0x1F
static let kVK_ANSI_U : CGKeyCode = 0x20
static let kVK_ANSI_LeftBracket : CGKeyCode = 0x21
static let kVK_ANSI_I : CGKeyCode = 0x22
static let kVK_ANSI_P : CGKeyCode = 0x23
static let kVK_ANSI_L : CGKeyCode = 0x25
static let kVK_ANSI_J : CGKeyCode = 0x26
static let kVK_ANSI_Quote : CGKeyCode = 0x27
static let kVK_ANSI_K : CGKeyCode = 0x28
static let kVK_ANSI_Semicolon : CGKeyCode = 0x29
static let kVK_ANSI_Backslash : CGKeyCode = 0x2A
static let kVK_ANSI_Comma : CGKeyCode = 0x2B
static let kVK_ANSI_Slash : CGKeyCode = 0x2C
static let kVK_ANSI_N : CGKeyCode = 0x2D
static let kVK_ANSI_M : CGKeyCode = 0x2E
static let kVK_ANSI_Period : CGKeyCode = 0x2F
static let kVK_ANSI_Grave : CGKeyCode = 0x32
static let kVK_ANSI_KeypadDecimal : CGKeyCode = 0x41
static let kVK_ANSI_KeypadMultiply : CGKeyCode = 0x43
static let kVK_ANSI_KeypadPlus : CGKeyCode = 0x45
static let kVK_ANSI_KeypadClear : CGKeyCode = 0x47
static let kVK_ANSI_KeypadDivide : CGKeyCode = 0x4B
static let kVK_ANSI_KeypadEnter : CGKeyCode = 0x4C
static let kVK_ANSI_KeypadMinus : CGKeyCode = 0x4E
static let kVK_ANSI_KeypadEquals : CGKeyCode = 0x51
static let kVK_ANSI_Keypad0 : CGKeyCode = 0x52
static let kVK_ANSI_Keypad1 : CGKeyCode = 0x53
static let kVK_ANSI_Keypad2 : CGKeyCode = 0x54
static let kVK_ANSI_Keypad3 : CGKeyCode = 0x55
static let kVK_ANSI_Keypad4 : CGKeyCode = 0x56
static let kVK_ANSI_Keypad5 : CGKeyCode = 0x57
static let kVK_ANSI_Keypad6 : CGKeyCode = 0x58
static let kVK_ANSI_Keypad7 : CGKeyCode = 0x59
static let kVK_ANSI_Keypad8 : CGKeyCode = 0x5B
static let kVK_ANSI_Keypad9 : CGKeyCode = 0x5C
// keycodes for keys that are independent of keyboard layout
static let kVK_Return : CGKeyCode = 0x24
static let kVK_Tab : CGKeyCode = 0x30
static let kVK_Space : CGKeyCode = 0x31
static let kVK_Delete : CGKeyCode = 0x33
static let kVK_Escape : CGKeyCode = 0x35
static let kVK_Command : CGKeyCode = 0x37
static let kVK_Shift : CGKeyCode = 0x38
static let kVK_CapsLock : CGKeyCode = 0x39
static let kVK_Option : CGKeyCode = 0x3A
static let kVK_Control : CGKeyCode = 0x3B
static let kVK_RightCommand : CGKeyCode = 0x36 // Out of order
static let kVK_RightShift : CGKeyCode = 0x3C
static let kVK_RightOption : CGKeyCode = 0x3D
static let kVK_RightControl : CGKeyCode = 0x3E
static let kVK_Function : CGKeyCode = 0x3F
static let kVK_F17 : CGKeyCode = 0x40
static let kVK_VolumeUp : CGKeyCode = 0x48
static let kVK_VolumeDown : CGKeyCode = 0x49
static let kVK_Mute : CGKeyCode = 0x4A
static let kVK_F18 : CGKeyCode = 0x4F
static let kVK_F19 : CGKeyCode = 0x50
static let kVK_F20 : CGKeyCode = 0x5A
static let kVK_F5 : CGKeyCode = 0x60
static let kVK_F6 : CGKeyCode = 0x61
static let kVK_F7 : CGKeyCode = 0x62
static let kVK_F3 : CGKeyCode = 0x63
static let kVK_F8 : CGKeyCode = 0x64
static let kVK_F9 : CGKeyCode = 0x65
static let kVK_F11 : CGKeyCode = 0x67
static let kVK_F13 : CGKeyCode = 0x69
static let kVK_F16 : CGKeyCode = 0x6A
static let kVK_F14 : CGKeyCode = 0x6B
static let kVK_F10 : CGKeyCode = 0x6D
static let kVK_F12 : CGKeyCode = 0x6F
static let kVK_F15 : CGKeyCode = 0x71
static let kVK_Help : CGKeyCode = 0x72
static let kVK_Home : CGKeyCode = 0x73
static let kVK_PageUp : CGKeyCode = 0x74
static let kVK_ForwardDelete : CGKeyCode = 0x75
static let kVK_F4 : CGKeyCode = 0x76
static let kVK_End : CGKeyCode = 0x77
static let kVK_F2 : CGKeyCode = 0x78
static let kVK_PageDown : CGKeyCode = 0x79
static let kVK_F1 : CGKeyCode = 0x7A
static let kVK_LeftArrow : CGKeyCode = 0x7B
static let kVK_RightArrow : CGKeyCode = 0x7C
static let kVK_DownArrow : CGKeyCode = 0x7D
static let kVK_UpArrow : CGKeyCode = 0x7E
// ISO keyboards only
static let kVK_ISO_Section : CGKeyCode = 0x0A
// JIS keyboards only
static let kVK_JIS_Yen : CGKeyCode = 0x5D
static let kVK_JIS_Underscore : CGKeyCode = 0x5E
static let kVK_JIS_KeypadComma : CGKeyCode = 0x5F
static let kVK_JIS_Eisu : CGKeyCode = 0x66
static let kVK_JIS_Kana : CGKeyCode = 0x68
var isModifier: Bool {
return (.kVK_RightCommand...(.kVK_Function)).contains(self)
}
var baseModifier: CGKeyCode?
{
if (.kVK_Command...(.kVK_Control)).contains(self)
|| self == .kVK_Function
{
return self
}
switch self
{
case .kVK_RightShift: return .kVK_Shift
case .kVK_RightCommand: return .kVK_Command
case .kVK_RightOption: return .kVK_Option
case .kVK_RightControl: return .kVK_Control
default: return nil
}
}
var isPressed: Bool {
CGEventSource.keyState(.combinedSessionState, key: self)
}
}
该解决方案的利润：
.keyboardShortcut().keyboardShortcut()缺点：
最佳使用方式：
someView()
.keyboardReaction { myMainViewKeyboardShortcuts($0) }
///////
func myMainViewKeyboardShortcuts(_ event: NSEvent) -> NSEvent {
switch event.keyCode {
case KeyCode.escape:
print("esc pressed!")
return nil // disable beep sound
case KeyCode.a:
print("A pressed!")
return nil // disable beep sound
default:
return event // beep sound will be here
}
}
keyboardReactionModifier.swift
#if os(macOS)
import Foundation
import SwiftUI
@available(macOS 11.0, *)
public extension View {
/// * Reaction on keyboard's .keyDown will be executed only in case of view located at window where window.isKeyWindow == true
/// * But reaction will be even if this window displays .sheet
/// * KeyCode struct located in Essentials
/// * Active Keyboard Layout does not matter
/// ```
///.keyboardReaction { event in
/// switch event.keyCode {
/// case KeyCode.escape:
/// print("esc pressed!")
/// return nil // disable beep sound
/// case KeyCode.a:
/// print("A pressed!")
/// return nil // disable beep sound
/// default:
/// return event // beep sound will be here
/// }
///}
/// ```
func keyboardReaction(action: @escaping (NSEvent) -> (NSEvent?) ) -> some View {
self.modifier(KeyboardReactiomModifier(action: action))
}
}
@available(macOS 11.0, *)
private struct KeyboardReactiomModifier: ViewModifier {
let action: (NSEvent) -> (NSEvent?)
@State var window: NSWindow? = nil
func body(content: Content) -> some View {
content
.wndAccessor { self.window = $0 }
.onAppear {
NSEvent.addLocalMonitorForEvents(matching: .keyDown) { event in
guard let window = window,
window.isKeyWindow
else { return event }
return action(event)
}
}
}
}
#endif
wndAccessorModifier.swift
#if os(macOS)
import SwiftUI
public extension View {
/// With this modifier you're able to access to window from View.
///
/// Usage:
/// ```
/// someView
/// .wndAccessor { wnd
/// self.window = wnd
/// }
/// ```
/// another sample:
/// ```
/// someView
/// .wndAccessor { wnd
/// wnd.title = "THIS... IS... WINDOOOOOW!"
/// }
/// ```
func wndAccessor(_ act: @escaping (NSWindow?) -> () )
-> some View {
self.modifier(WndTitleConfigurer(act: act))
}
}
private struct WndTitleConfigurer: ViewModifier {
let act: (NSWindow?) -> ()
@State var window: NSWindow? = nil
func body(content: Content) -> some View {
content
.getWindow($window)
.onChange(of: window, perform: act )
}
}
//////////////////////////////
///HELPERS
/////////////////////////////
private extension View {
func getWindow(_ wnd: Binding<NSWindow?>) -> some View {
self.background(WindowAccessor(window: wnd))
}
}
private struct WindowAccessor: NSViewRepresentable {
@Binding var window: NSWindow?
public func makeNSView(context: Context) -> NSView {
let view = NSView()
DispatchQueue.main.async {
self.window = view.window
}
return view
}
public func updateNSView(_ nsView: NSView, context: Context) {}
}
#endif
KeyCode.swift
import SwiftUI
public struct KeyCode {
public static let returnKey : UInt16 = 0x24
public static let enter : UInt16 = 36 //0x4C
public static let tab : UInt16 = 0x30
public static let space : UInt16 = 0x31
public static let delete : UInt16 = 0x33
public static let escape : UInt16 = 0x35
public static let command : UInt16 = 0x37
public static let shift : UInt16 = 0x38
public static let capsLock : UInt16 = 0x39
public static let option : UInt16 = 0x3A
public static let control : UInt16 = 0x3B
public static let rightShift : UInt16 = 0x3C
public static let rightOption : UInt16 = 0x3D
public static let rightControl : UInt16 = 0x3E
public static let leftArrow : UInt16 = 0x7B
public static let rightArrow : UInt16 = 0x7C
public static let downArrow : UInt16 = 0x7D
public static let upArrow : UInt16 = 0x7E
public static let volumeUp : UInt16 = 0x48
public static let volumeDown : UInt16 = 0x49
public static let mute : UInt16 = 0x4A
public static let help : UInt16 = 0x72
public static let home : UInt16 = 0x73
public static let pageUp : UInt16 = 0x74
public static let forwardDelete : UInt16 = 0x75
public static let end : UInt16 = 0x77
public static let pageDown : UInt16 = 0x79
public static let function : UInt16 = 0x3F
public static let f1 : UInt16 = 0x7A
public static let f2 : UInt16 = 0x78
public static let f4 : UInt16 = 0x76
public static let f5 : UInt16 = 0x60
public static let f6 : UInt16 = 0x61
public static let f7 : UInt16 = 0x62
public static let f3 : UInt16 = 0x63
public static let f8 : UInt16 = 0x64
public static let f9 : UInt16 = 0x65
public static let f10 : UInt16 = 0x6D
public static let f11 : UInt16 = 0x67
public static let f12 : UInt16 = 0x6F
public static let f13 : UInt16 = 0x69
public static let f14 : UInt16 = 0x6B
public static let f15 : UInt16 = 0x71
public static let f16 : UInt16 = 0x6A
public static let f17 : UInt16 = 0x40
public static let f18 : UInt16 = 0x4F
public static let f19 : UInt16 = 0x50
public static let f20 : UInt16 = 0x5A
// US-ANSI Keyboard Positions
// eg. These key codes are for the physical key (in any keyboard layout)
// at the location of the named key in the US-ANSI layout.
public static let a : UInt16 = 0x00
public static let b : UInt16 = 0x0B
public static let c : UInt16 = 0x08
public static let d : UInt16 = 0x02
public static let e : UInt16 = 0x0E
public static let f : UInt16 = 0x03
public static let g : UInt16 = 0x05
public static let h : UInt16 = 0x04
public static let i : UInt16 = 0x22
public static let j : UInt16 = 0x26
public static let k : UInt16 = 0x28
public static let l : UInt16 = 0x25
public static let m : UInt16 = 0x2E
public static let n : UInt16 = 0x2D
public static let o : UInt16 = 0x1F
public static let p : UInt16 = 0x23
public static let q : UInt16 = 0x0C
public static let r : UInt16 = 0x0F
public static let s : UInt16 = 0x01
public static let t : UInt16 = 0x11
public static let u : UInt16 = 0x20
public static let v : UInt16 = 0x09
public static let w : UInt16 = 0x0D
public static let x : UInt16 = 0x07
public static let y : UInt16 = 0x10
public static let z : UInt16 = 0x06
public static let zero : UInt16 = 0x1D
public static let one : UInt16 = 0x12
public static let two : UInt16 = 0x13
public static let three : UInt16 = 0x14
public static let four : UInt16 = 0x15
public static let five : UInt16 = 0x17
public static let six : UInt16 = 0x16
public static let seven : UInt16 = 0x1A
public static let eight : UInt16 = 0x1C
public static let nine : UInt16 = 0x19
public static let equals : UInt16 = 0x18
public static let minus : UInt16 = 0x1B
public static let semicolon : UInt16 = 0x29
public static let apostrophe : UInt16 = 0x27
public static let comma : UInt16 = 0x2B
public static let period : UInt16 = 0x2F
public static let forwardSlash : UInt16 = 0x2C
public static let backslash : UInt16 = 0x2A
public static let grave : UInt16 = 0x32
public static let leftBracket : UInt16 = 0x21
public static let rightBracket : UInt16 = 0x1E
public static let keypadDecimal : UInt16 = 0x41
public static let keypadMultiply : UInt16 = 0x43
public static let keypadPlus : UInt16 = 0x45
public static let keypadClear : UInt16 = 0x47
public static let keypadDivide : UInt16 = 0x4B
public static let keypadEnter : UInt16 = 0x4C
public static let keypadMinus : UInt16 = 0x4E
public static let keypadEquals : UInt16 = 0x51
public static let keypad0 : UInt16 = 0x52
public static let keypad1 : UInt16 = 0x53
public static let keypad2 : UInt16 = 0x54
public static let keypad3 : UInt16 = 0x55
public static let keypad4 : UInt16 = 0x56
public static let keypad5 : UInt16 = 0x57
public static let keypad6 : UInt16 = 0x58
public static let keypad7 : UInt16 = 0x59
public static let keypad8 : UInt16 = 0x5B
public static let keypad9 : UInt16 = 0x5C
}