Final Cut Pro插件开发：macOS自动化权限弹窗自动消失问题

问题分析 #

添加时间线观察者时，系统弹出的自动化权限弹窗仅显示1秒就消失，导致观察者虽已添加但无权限获取数据，问题出在host.timeline!.add(timelineObserver)执行时机上——同步添加观察者会触发回调逻辑，干扰权限弹窗的正常显示流程。

解决方案 #

1. 延迟添加观察者，给弹窗留足交互时间 #

将观察者添加操作放到主线程延迟执行，避免同步操作打断权限弹窗的展示：

let host = ProExtensionHostSingleton() as! FCPXHost
if host.timeline != nil {
    DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
        host.timeline!.add(self.timelineObserver)
    }
}

2. 提前手动请求自动化权限 #

在插件初始化阶段主动请求权限，确保用户授权后再添加观察者，避免后续操作干扰弹窗：

import ApplicationServices

// 插件初始化时调用
func requestAutomationPermission() {
    let options = [kAXTrustedCheckOptionPrompt.takeRetainedValue() as String: true] as CFDictionary
    AXIsProcessTrustedWithOptions(options)
}

// 确认权限后再添加观察者
let host = ProExtensionHostSingleton() as! FCPXHost
if host.timeline != nil {
    requestAutomationPermission()
    // 稍作延迟确保权限请求弹窗正常显示
    DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) {
        host.timeline!.add(self.timelineObserver)
    }
}

3. 在观察者回调中校验权限 #

避免回调逻辑在未授权时执行，导致权限弹窗被中断：

class TimelineObserver: NSObject, FCPXTimelineObserver {
    func activeSequenceChanged() {
        // 校验权限状态
        let checkOptions = [kAXTrustedCheckOptionPrompt.takeRetainedValue() as String: false] as CFDictionary
        guard AXIsProcessTrustedWithOptions(checkOptions) else {
            // 未授权时手动触发权限请求
            let promptOptions = [kAXTrustedCheckOptionPrompt.takeRetainedValue() as String: true] as CFDictionary
            AXIsProcessTrustedWithOptions(promptOptions)
            return
        }
        
        // 有权限后再执行业务逻辑
        let host = ProExtensionHostSingleton() as! FCPXHost
        let hasTimeline: Bool = host.timeline?.activeSequence != nil
        NotificationCenter.default.post(name: Notification.Name("timelineChanged"), object: nil, userInfo: ["hasTimeline": hasTimeline])
        print("AAA", hasTimeline)
    }
    
    func playheadTimeChanged() {}
    
    func sequenceTimeRangeChanged() {}
}

内容的提问来源于stack exchange，提问作者Luis Parente