如何通过Terminal或Swift禁用macOS应用的三指轻按查词手势？

Hey there! Let's work through this for your macOS app built with Xcode and Swift. You want to retain text highlighting/selection but turn off that three-finger tap gesture that pops up word definitions. Below are two reliable approaches—one for app-specific control (using Swift) and another for system-wide changes (via Terminal):

1. Swift Code Solutions (App-Only, Recommended) #

These methods only affect your app, so you won't mess with the user's system-wide settings.

Global App-Wide Disable #

The simplest way to block the lookup gesture across all your app's components (NSTextView, WKWebView, etc.) is to add this to your AppDelegate.swift's launch method:

func applicationDidFinishLaunching(_ aNotification: Notification) {
    // Block the system's three-finger tap lookup gesture in your app
    NSApp.suppressGesture(withIdentifier: .lookup)
}

This completely stops the lookup popup while leaving text selection fully functional.

Target Specific NSTextViews #

If you only want to disable the gesture on certain text views, create a custom NSTextView subclass to filter out the three-finger tap gesture:

class NoLookupTextView: NSTextView {
    override func awakeFromNib() {
        super.awakeFromNib()
        // Find and disable the three-finger tap gesture recognizer
        gestureRecognizers?.forEach { gesture in
            if let clickGesture = gesture as? NSClickGestureRecognizer,
               clickGesture.numberOfTouchesRequired == 3 {
                clickGesture.isEnabled = false
            }
        }
    }
}

Then just set your text view's class to NoLookupTextView in your Storyboard or XIB file.

Target WKWebViews #

For web views, combine the global app disable with a configuration tweak to ensure no lookup triggers from WebKit:

let webConfig = WKWebViewConfiguration()
// Disable WebKit's built-in lookup panel trigger
webConfig.preferences.setValue(false, forKey: "allowLookupPanel")

// Initialize your web view with this config
let webView = WKWebView(frame: .zero, configuration: webConfig)

The global suppressGesture call will still apply here, giving you double protection against the lookup popup.

2. Terminal Command (System-Wide Disable) #

If you want to turn off the three-finger tap lookup across the entire system (note: this affects all apps, not just yours), run these commands in Terminal:

# Disable the global three-finger tap gesture
defaults write NSGlobalDomain com.apple.trackpad.threeFingerTapGesture -int 0

# Restart Finder to apply changes immediately
killall Finder

To revert back later, use:

defaults write NSGlobalDomain com.apple.trackpad.threeFingerTapGesture -int 1
killall Finder

Quick Notes #

• Stick with the Swift code approach if you can—it's the most user-friendly, as it doesn't alter their system settings outside your app.
• All these methods preserve full text highlighting and selection functionality—exactly what you need.

内容的提问来源于stack exchange，提问作者Noah H