简化 WebActivity 的 onBackPressed 逻辑

Author: Goooler

web/src/main/kotlin/io/goooler/demoapp/web/WebActivity.kt

@@ -38,9 +38,7 @@ class WebActivity : BaseBindingActivity<WebActivityBinding>() {
   }
 
   override fun onBackPressed() {
-    if (webFragment?.canGoBack == true) {
-      webFragment?.goBack()
-    } else {
+    if (webFragment?.goBack() == false) {
       super.onBackPressed()
     }
   }

web/src/main/kotlin/io/goooler/demoapp/web/WebFragment.kt

@@ -23,10 +23,8 @@ class WebFragment : BaseBindingFragment<WebFragmentBinding>() {
 
   val url: String? get() = binding.webView.url
 
-  val canGoBack: Boolean get() = binding.webView.canGoBack()
-
-  fun goBack() {
-    binding.webView.goBack()
+  fun goBack(): Boolean = binding.webView.canGoBack().also {
+    if (it) binding.webView.goBack()
   }
 
   override fun initOnce() {