Concurrent modification during iteration: Instance(length:3) of '_GrowableList'.

[criusKer]

根据 “Flutter 游戏开发(flame) 01 开发2D休闲游戏：消灭小飞蝇(1/5)“ 这篇写完后，点击“小飞蝇”会报Concurrent modification during iteration: Instance(length:3) of '_GrowableList'.

[HarrisonQi]

仔细核对下代码, 是否有出入. 或直接clone首篇文章的仓库.

[criusKer]

clone试了下也是一样的

[HarrisonQi]

终端中输入

flutter doctor

粘贴下信息.

还有你的flame版本

[criusKer]

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 1.22.5, on Microsoft Windows [Version 10.0.18363.1440], locale zh-CN)

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
[!] Android Studio (version 4.1.0)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
[!] IntelliJ IDEA Ultimate Edition (version 2018.2)
    X Flutter plugin not installed; this adds Flutter specific functionality.
    X Dart plugin not installed; this adds Dart specific functionality.
[√] Connected device (1 available)

! Doctor found issues in 2 categories.

flame: ^0.29.0

[ShanRaw]

可以尝试修改 langaw-game.dart onTapDown 方法里面forEach 改为for 并且在响应事件后 break 退出循环 flies.forEach((Fly fly) { if (fly.flyRect.contains(d.globalPosition)) { fly.onTapDown(); isHandled = true; didHitAFly = true; } }); 改为 for (int i = 0; i < files.length; i++) { if (files[i].flyRect.contains(details.globalPosition)) { files[i].onTapDown(); isHandled = true; didHitAFly = true; break; } }