新增错误处理

新增对发布内容的输入校验，并在输入不合法时弹出提示信息。

app/src/main/java/com/aiosman/riderpro/ui/post/NewPost.kt

@@ -3,6 +3,7 @@ package com.aiosman.riderpro.ui.post
 import android.app.Activity
 import android.content.Intent
 import android.util.Log
+import android.widget.Toast
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.animation.AnimatedVisibility
@@ -123,7 +124,6 @@ fun NewPostTopBar(onSendClick: () -> Unit = {}) {
     val model = NewPostViewModel
     var showProgressBar by remember { mutableStateOf(false) }
     var uploadProgress by remember { mutableStateOf(0f) }
-
     Box(
         modifier = Modifier
             .fillMaxWidth()
@@ -148,6 +148,12 @@ fun NewPostTopBar(onSendClick: () -> Unit = {}) {
                 modifier = Modifier
                     .size(24.dp)
                     .noRippleClickable {
+                        // 检查输入
+                        val errorMessage = model.validateMoment()
+                        if (errorMessage != null) {
+                            Toast.makeText(context, errorMessage, Toast.LENGTH_SHORT).show()
+                            return@noRippleClickable
+                        }
                         // 点击发送按钮后立即导航回主页
                         navController.popBackStack()
                         // 显示进度条