Flutter使用拖动和按钮单击来展开TextField

Question

如何通过拖动并单击按钮来增加/减少maxLines中TextField的数量？

Answer 1

屏幕截图：

---

完整代码：

"ShutdownTimer.Server": {
  "commandName": "Project",
  "launchBrowser": true,
  "applicationUrl": "https://localhost:5001;http://localhost:5000",
  "environmentVariables": {
    "ASPNETCORE_ENVIRONMENT": "Development"
  }
},
"ShutdownTimer.Server (localIP)": {
    "commandName": "Project",
    "launchBrowser": true,
    "applicationUrl": "https://192.168.0.115:5001;http://192.168.0.115:5000",
    "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
    }
}