KeyShortcutResponder
struct KeyShortcut
1
2
3
4
let title: String
let input: String
let modifiers: UIKeyModifierFlags
let action: () -> Void
protocol KeyShortcutResponder
1
var keyShortcuts: [KeyShortcut] { get };
class KeyShortcutsController:UIResponder
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
private var effectiveShortcuts: [KeyShortcut]?
private var viewControllerEnumerator: (@escaping (ContainableController) -> Bool) -> Void
public static var isAvailable: Bool {
if #available(iOSApplicationExtension 8.0, iOS 8.0, *), UIDevice.current.userInterfaceIdiom == .pad {
return true
} else {
return false
}
}
public init(enumerator: @escaping (@escaping (ContainableController) -> Bool) -> Void) {
self.viewControllerEnumerator = enumerator
super.init()
}
// key commands
public override var keyCommands: [UIKeyCommand]? {
var convertedCommands: [UIKeyCommand] = []
var shortcuts: [KeyShortcut] = []
self.viewControllerEnumerator({ viewController -> Bool in
guard let viewController = viewController as? KeyShortcutResponder else {
return true
}
shortcuts.removeAll(where: { viewController.keyShortcuts.contains($0) })
shortcuts.append(contentsOf: viewController.keyShortcuts)
return true
})
convertedCommands.append(contentsOf: shortcuts.map { $0.uiKeyCommand })
self.effectiveShortcuts = shortcuts
return convertedCommands
}
// handle key command
@objc func handleKeyCommand(_ command: UIKeyCommand) {
if let shortcut = findShortcut(for: command) {
shortcut.action()
}
}
// find shorcut for command
private func findShortcut(for command: UIKeyCommand) -> KeyShortcut? {
if let shortcuts = self.effectiveShortcuts {
for shortcut in shortcuts {
if shortcut.isEqual(to: command) {
return shortcut
}
}
}
return nil
}
// can perform action
public override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
if let keyCommand = sender as? UIKeyCommand, let _ = findShortcut(for: keyCommand) {
return true
} else {
return super.canPerformAction(action, withSender: sender)
}
}
// targe for action
public override func target(forAction action: Selector, withSender sender: Any?) -> Any? {
if let keyCommand = sender as? UIKeyCommand, let _ = findShortcut(for: keyCommand) {
return self
} else {
return super.target(forAction: action, withSender: sender)
}
}
// can become first responder
public override var canBecomeFirstResponder: Bool {
return true
}