update native-view.md

docs/component/native-view.md

@@ -51,7 +51,159 @@
 
 <!-- UTSCOMJSON.native-view.children -->
 
-<!-- UTSCOMJSON.native-view.example -->
+<!-- UTSCOMJSON.native-view.example -->
+
+native-button 组件代码实现如下：
+```uts
+<template>
+	<native-view @init="onviewinit" @customClick="ontap"></native-view>
+</template>
+<script setup lang="uts">
+	import { NativeButton } from "@/uni_modules/native-button";
+	let button : NativeButton | null = null
+
+	//声明属性
+	const props = defineProps<{ text : string }>()
+
+	//声明事件
+	const emit = defineEmits<{
+		(e : "load") : void
+		(e : "buttonTap", event : UniNativeViewEvent) : void
+	}>()
+
+	//声明方法
+	function updateText(value : string) {
+		button?.updateText(value)
+	}
+
+	//监听属性变化
+	watchEffect(() => {
+		const text = props.text
+		updateText(text)
+	})
+
+	//native-view初始化时触发此方法
+	function onviewinit(e : UniNativeViewInitEvent) {
+		//获取UniNativeViewElement 传递给NativeButton对象
+		button = new NativeButton(e.detail.element);
+		updateText(props.text)
+		emit("load")
+	}
+
+	function ontap(e : UniNativeViewEvent) {
+		emit("buttonTap", e)
+	}
+
+	function onUnmounted() {
+		// iOS平台需要主动释放 uts 实例
+		button?.destroy()
+	}
+</script>
+
+```
+
+NativeButton原生对象代码如下：
+
+::: preview
+
+> Android
+
+```uts
+import { Button } from "android.widget"
+
+export class NativeButton {
+	$element: UniNativeViewElement;
+
+	constructor(element: UniNativeViewElement) {
+		this.$element = element;
+		this.bindView();
+	}
+
+	button: Button | null = null;
+	bindView() {
+		//通过UniElement.getAndroidActivity()获取android平台activity 用于创建view的上下文
+		this.button = new Button(this.$element.getAndroidActivity()!);  //构建原生view
+		//限制原生Button 文案描述不自动大写
+		this.button?.setAllCaps(false)
+		//监听原生Button点击事件
+		this.button?.setOnClickListener(_ => {
+			const detail = {}
+			//构建自定义UniNativeViewEvent返回对象
+			const event = new UniNativeViewEvent("customClick", detail)
+			//响应分发原生Button的点击事件
+			this.$element.dispatchEvent(event)
+		})
+		//UniNativeViewEvent 绑定 安卓原生view
+		this.$element.bindAndroidView(this.button!);
+	}
+
+	updateText(text: string) {
+		//更新原生Button 文案描述
+		this.button?.setText(text)
+	}
+
+	destroy() {
+		//数据回收
+	}
+}
+```
+
+> iOS
+
+```uts
+import { UIButton, UIControl } from "UIKit"
+
+export class NativeButton {
+
+	element : UniNativeViewElement;
+	button : UIButton | null;
+
+	constructor(element : UniNativeViewElement) {
+    // 接收组件传递过来的UniNativeViewElement
+		this.element = element;
+		super.init()
+		this.bindView();
+	}
+
+	// element 绑定原生view
+	bindView() {
+    // 初始化原生 UIButton
+    this.button = new UIButton(type=UIButton.ButtonType.system)
+    // 构建方法选择器
+    const method = Selector("buttonClickAction")
+    // button 绑定点击回调方法
+    button?.addTarget(this, action = method, for = UIControl.Event.touchUpInside)
+    // UniNativeViewElement 绑定原生 view
+		this.element.bindIOSView(this.button!);
+	}
+
+	updateText(text : string) {
+    // 更新 button 显示文字
+		this.button?.setTitle(text, for = UIControl.State.normal)
+	}
+
+	/**
+	 * 按钮点击回调方法
+	 * 在 swift 中，所有target-action (例如按钮的点击事件，NotificationCenter 的通知事件等)对应的 action 函数前面都要使用 @objc 进行标记。
+	 */
+	@objc buttonClickAction() {
+    //构建自定义 UniNativeViewEvent 对象
+		let event = new UniNativeViewEvent("customClick")
+    //触发自定义事件
+		this.element.dispatchEvent(event)
+	}
+
+	destroy() {
+    // 释放 UTS 实例对象，避免内存泄露
+		UTSiOS.destroyInstance(this)
+	}
+}
+
+```
+
+:::
+
+具体示例请参考：[native-button](https://gitcode.net/dcloud/hello-uni-app-x/-/blob/alpha/uni_modules/native-button/components/native-button/native-button.uvue)插件
 
 <!-- UTSCOMJSON.native-view.reference -->