Question

我有一个带有密钥通知的NSTextField。当按下键时我想检查插入位置是否在位置0：做某事，否则做默认动作。

class ConsoleTextField: NSTextField {
    var commandHistory:[String] = []
    var commandPosition:Int = 0
    var keyDownMonitor:Any? = nil

    override func becomeFirstResponder() -> Bool {
        if keyDownMonitor == nil {
            keyDownMonitor = NSEvent.addLocalMonitorForEvents(matching: .keyDown) {
                self.keyDown(with: $0)
                return $0
            }
        }
        return super.becomeFirstResponder()
    }

    override func textDidEndEditing(_ notification: Notification) {
        super.textDidEndEditing(notification)
        if let keyDownMonitor = keyDownMonitor {
            NSEvent.removeMonitor(keyDownMonitor)
        }

        keyDownMonitor = nil
    }

    override func keyDown(with event: NSEvent) {
            switch event.keyCode {
            case 125: // down arrow key
                // here I want to check current caret position in text field
            default:
                break
            }
        }
}

我看到相关问题，如下：

How to find caret position in an NSTextView?

但是我无法让它们在Swift上运行

Answer 1

弄清楚：

self.currentEditor()?.selectedRange.location

NSTextField获得购物车位置

1 个答案: