Flutter ios高刷不生效解決方案（iPhone高刷系列）

遇到問題

直接編譯Flutter項目到ios15.4版本的iPhone高刷系列的設備上，估計只有60幀不到，這在120Hz的機型上屬於遠古退化的體驗，是無法忍受的，對用戶體驗來說是毀滅性打擊。

解決步驟

1. 在/項目/ios/Runner/Info.plist下 的作用域下新增 <key>CADisableMinimumFrameDurationOnPhone</key><true/>，使其官方的Promotion失效，變成強制刷新率
2. 在/項目/ios/Runner/AppDelegate.swift下application作用域新增：

if #available(iOS 15.0, *) {
  let displayLink = CADisplayLink(target: self, selector: #selector(step))
  displayLink.preferredFrameRateRange = CAFrameRateRange(minimum:120, maximum:120, preferred:120)
  displayLink.add(to: .current, forMode: .default)
}

使之變成：

import UIKit
import Flutter

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    if #available(iOS 15.0, *) {
      let displayLink = CADisplayLink(target: self, selector: #selector(step))
      displayLink.preferredFrameRateRange = CAFrameRateRange(minimum:120, maximum:120, preferred:120)
      displayLink.add(to: .current, forMode: .default)
    }
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
  @objc func step(displaylink: CADisplayLink) {
      // Will be called once a frame has been built while matching desired frame rate
  }
}

3. 將flutter升級到最新Master分支
   請先運行flutter channel master
   再運行flutter upgrade升級到最新版本

4. 重新編譯運行
   flutter build ios --release
flutter install

5. 官方Github下此問題相關的issue
   點我訪問Issue-90675