Flutter ios高刷不生效解决方案（iPhone高刷系列）

遇到问题

直接编译Flutter项目到ios15.4版本的iPhone高刷系列的设备上，估计只有60帧不到，这在120Hz的机型上属于远古退化的体验，是无法忍受的，对用户体验来说是毁灭性打击。

解决步骤

1. 在/项目/ios/Runner/Info.plist下 的作用域下新增 <key>CADisableMinimumFrameDurationOnPhone</key><true/>，使其官方的Promotion失效，变成强制刷新率
2. 在/项目/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)
}

使之变成：

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. 将flutter升级到最新Master分支
   请先运行flutter channel master
   再运行flutter upgrade升级到最新版本

4. 重新编译运行
   flutter build ios --release
flutter install

5. 官方Github下此问题相关的issue
   点我访问Issue-90675