update textpicker

Signed-off-by: Ntengfan66 <tengfan3@huawei.com>

zh-cn/application-dev/reference/arkui-ts/ts-basic-components-textpicker.md

@@ -116,3 +116,27 @@ struct TextPickerExample {
 ```
 
 ![textpicker](figures/textpicker.gif)
+
+```ts
+// xxx.ets
+@Entry
+@Component
+struct TextPickerExample {
+  private select: number = 1
+  private fruits: string[] = ['apple1', 'orange2', 'peach3', 'grape4']
+
+  build() {
+    Column() {
+      TextPicker({ range: this.fruits, selected: this.select })
+        .onChange((value: string, index: number) => {
+          console.info('Picker item changed, value: ' + value + ', index: ' + index)
+        })
+        .disappearTextStyle({color: Color.Red, font: {size: 15, weight: FontWeight.Lighter}})
+        .textStyle({color: Color.Black, font: {size: 20, weight: FontWeight.Normal}})
+        .selectedTextStyle({color: Color.Blue, font: {size: 30, weight: FontWeight.Bolder}})
+    }.width('100%').height('100%')
+  }
+}
+```
+
+![textpicker](figures/textpicker1.gif)