chore(doc): Update Component README.md

Author: cuilanxin

packages/core/src/SelectCascader/README.md

@@ -14,6 +14,7 @@ export default class SelectCascaderDemo extends Component {
   constructor(props: SelectCascaderProps) {
     super(props);
     this.state = {
+      visible: false
     };
   }
 
@@ -22,9 +23,6 @@ export default class SelectCascaderDemo extends Component {
     console.log("label-------->", label);
   }
 
-  onDismiss(e: any) {
-
-  }
   render() {
     const data = [
       {
@@ -109,10 +107,22 @@ export default class SelectCascaderDemo extends Component {
       },
     ]
     return (
-      <SelectCascader
-        data={data}
-        onChange={this.onChange}
-      />
+      <React.Fragment>
+         <Button
+          onPress={() => {
+            this.setState({visible: true});
+          }}>
+          显示选择器
+        </Button>
+        <SelectCascader
+          data={data}
+          onChange={this.onChange}
+          visible={this.state.visible}
+          onDismiss={() => {
+            this.setState({visible: false});
+          }}
+        />
+      <React.Fragment>
     );
   }
 }

website/src/pages/docs/getting-started/README.md

@@ -36,9 +36,12 @@ npx react-native init AwesomeProject --template @uiw/react-native-template
 ## Install
 
 ```bash
-yarn add @uiw/react-native react-native-svg react-native-root-siblings
+yarn add @uiw/react-native react-native-svg react-native-root-siblings @react-native-picker/picker
 ```
 
+> ⚠️ 注意：安装 @react-native-picker/picker，可能需要重新 pod install
+<!--rehype:style=border-left: 8px solid #ffe564;background-color: #ffe56440;padding: 12px 16px;-->
+
 ## Basic Usage
 
 <!--rehype:snack=true-->