我想在我的小应用程序中捕捉关键事件。
我做了什么:
class ViewController : NSViewController {
...
override func keyDown(theEvent: NSEvent) {
if theEvent.keyCode == 124 {
println("abc")
} else {
println("abcd")
}
}
override var acceptsFirstResponder: Bool {
return true
}
override func becomeFirstResponder() -> Bool {
return true
}
override func resignFirstResponder() -> Bool {
return true
}
...
}
会发生什么:
当按下一个键时,Funk
音效会播放。
我看到很多帖子都在谈论这是一个属于 NSView
而 NSViewController
没有访问权限的委托(delegate)。但是 keydown
函数 override
在 NSViewController
类型的类中自动完成,这让我相信这是错误的。
最佳答案
Xcode 8.2.1 • Swift 3.0.2
import Cocoa
class ViewController: NSViewController {
@IBOutlet var textField: NSTextField!
override func viewDidLoad() {
super.viewDidLoad()
NSEvent.addLocalMonitorForEvents(matching: .flagsChanged) {
self.flagsChanged(with: $0)
return $0
}
NSEvent.addLocalMonitorForEvents(matching: .keyDown) {
self.keyDown(with: $0)
return $0
}
}
override func keyDown(with event: NSEvent) {
switch event.modifierFlags.intersection(.deviceIndependentFlagsMask) {
case [.command] where event.characters == "l",
[.command, .shift] where event.characters == "l":
print("command-l or command-shift-l")
default:
break
}
textField.stringValue = "key = " + (event.charactersIgnoringModifiers
?? "")
textField.stringValue += "\ncharacter = " + (event.characters ?? "")
}
override func flagsChanged(with event: NSEvent) {
switch event.modifierFlags.intersection(.deviceIndependentFlagsMask) {
case [.shift]:
print("shift key is pressed")
case [.control]:
print("control key is pressed")
case [.option] :
print("option key is pressed")
case [.command]:
print("Command key is pressed")
case [.control, .shift]:
print("control-shift keys are pressed")
case [.option, .shift]:
print("option-shift keys are pressed")
case [.command, .shift]:
print("command-shift keys are pressed")
case [.control, .option]:
print("control-option keys are pressed")
case [.control, .command]:
print("control-command keys are pressed")
case [.option, .command]:
print("option-command keys are pressed")
case [.shift, .control, .option]:
print("shift-control-option keys are pressed")
case [.shift, .control, .command]:
print("shift-control-command keys are pressed")
case [.control, .option, .command]:
print("control-option-command keys are pressed")
case [.shift, .command, .option]:
print("shift-command-option keys are pressed")
case [.shift, .control, .option, .command]:
print("shift-control-option-command keys are pressed")
default:
print("no modifier keys are pressed")
}
}
}
要消除按下字符键时发出的咕噜声,您需要对 View 进行子类化,覆盖方法 performKeyEquivalent 并返回 true。
import Cocoa
class View: NSView {
override func performKeyEquivalent(with event: NSEvent) -> Bool {
return true
}
}
关于macos - Swift - 从 NSViewController 捕获按键,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32446978/