react native自定义 组件[1]

原生UI组件
React-Native之Android:封装原生UI组件

与自定义module差不多，module继承‘ReactContextBaseJavaModule’
view继承 SimpleViewManager
rn版本0.38
使用android textView

1、实现SimpleViewManager ViewManager的子类

package react.view;

import android.graphics.Color;
import android.widget.TextView;

import com.facebook.react.uimanager.SimpleViewManager;
import com.facebook.react.uimanager.ThemedReactContext;
import com.facebook.react.uimanager.ViewProps;
import com.facebook.react.uimanager.annotations.ReactProp;

/**
 * Created by Administrator on 2016/12/7.
 */

public class MyViewManager extends SimpleViewManager {
    @Override
    public String getName() {
        return "MyTextView";
    }

    @Override
    protected TextView createViewInstance(ThemedReactContext reactContext) {
        return new TextView(reactContext.getBaseContext());
    }

    private void log(String str) {
//        Log.d("MyViewManager", str);
    }

    @ReactProp(name = "text")
    public void setText(TextView view, String text) {
        log("setText ->" + view.toString() + " " + text);
        view.setText(text);
    }

    @ReactProp(name = ViewProps.BACKGROUND_COLOR, defaultInt = 0x000000)
    public void setBackgroudColor(TextView view, int color) {
        view.setBackgroundColor(color);
    }

    @ReactProp(name = ViewProps.FONT_SIZE, defaultFloat = 18)
    public void setTextSize(TextView view, float fontSize) {
        log("setTextSize ->" + view.toString() + " " + fontSize);
        view.setTextSize(fontSize);
    }

    @ReactProp(name = ViewProps.COLOR, defaultInt = Color.BLACK)
    public void setTextColor(TextView view, int textColor) {
        log("setTextColor ->" + view.toString() + " " + textColor);
        view.setTextColor(textColor);
    }

    @ReactProp(name = "isAlpha", defaultBoolean = false)
    public void setTextAlpha(TextView view, boolean isAlpha) {
        log("setTextAlpha ->" + view.toString() + " " + isAlpha);
        if (isAlpha) {
            view.setAlpha(0.5f);
        } else {
        }
    }
}

2、ViewManager 添加到ReactPackage

package react.view;

import com.facebook.react.ReactPackage;
import com.facebook.react.bridge.JavaScriptModule;
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.uimanager.ViewManager;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Created by Administrator on 2016/12/7.
 */

public class MyViewReactPackage implements ReactPackage {
    @Override
    public List createNativeModules(ReactApplicationContext reactContext) {
        return Collections.emptyList();
    }

    @Override
    public List> createJSModules() {
        return Collections.emptyList();
    }

    @Override
    public List createViewManagers(ReactApplicationContext reactContext) {
        List list = new ArrayList<>();
        list.add(new MyViewManager());
        return list;
    }
}

3、ReactPackage 添加到Application

public class MainApplication extends Application implements ReactApplication {

  private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
    @Override
    protected boolean getUseDeveloperSupport() {
      return BuildConfig.DEBUG;
    }

    @Override
    protected List getPackages() {
      return Arrays.asList(
          new MainReactPackage(),
            new VectorIconsPackage(),
              new PickerPackage(),
              new MyModuleReactPackage(),
              new MyViewReactPackage()
      );
    }
  };

4、js 定义组件

myTextView .js

/**
 * Created by Administrator on 2016/12/7.
 */
import { PropTypes } from 'react';
import { requireNativeComponent } from 'react-native';

var myTextView = {
    name: 'MyTextView',
    propTypes: {
        text: PropTypes.string,
        fontSize: PropTypes.number,
        color: PropTypes.number,
        isAlpha: PropTypes.bool,
        backgroundColor:PropTypes.number,

        testID:PropTypes.string,
        accessibilityComponentType:PropTypes.string,
        accessibilityLabel:PropTypes.string,
        accessibilityLiveRegion:PropTypes.string,
        renderToHardwareTextureAndroid:PropTypes.bool,
        importantForAccessibility:PropTypes.string,
        onLayout:PropTypes.bool,
    }
}
module.exports = requireNativeComponent('MyTextView', myTextView);

其中的propTypes text 为java中MyViewManager定义的@ReactProp注解 name值

支持的类型_官方文档了

5、使用 就可以和正常的组件一样使用

/**
 * Created by Administrator on 2016/12/7.
 */
import React, { Component } from 'react';
import {
    StyleSheet,
    requireNativeComponent,
    PropTypes,
    Dimensions,
    Alert,
    Text,
    View
} from 'react-native'
import MyTextView from './componet/MyTextView.js'
const dimensions = Dimensions.get('window');
class NativeViewDemo extends Component {

    // 构造
    constructor(props) {
        super(props);
        // 初始状态
        this.state = {};
    }

    _onPress = ()=> {
        Alert.alert("onPress")
    }
    // 渲染
    render() {
        /*
         在styles中使用与在属性中使用效果是一样的，属性中使用会覆盖样式中的使用
         */
        return (
            
                
            
        );
    }

}
const styles = StyleSheet.create({
    textDefault: {
        width: dimensions.width,
        paddingLeft: 20,
        fontSize: 10,
        height: 100,
    },
});
export default NativeViewDemo;

6、事件处理 相互绑定

java 发送事件

  public class MyViewManager extends SimpleViewManager {
    @Override
    public String getName() {
        return "MyTextView";
    }

    @Override
    protected TextView createViewInstance(final ThemedReactContext reactContext) {
        final TextView textView = new TextView(reactContext.getBaseContext());
        textView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                log("onTouch() called with: " + "v = [" + v + "], event = [" + event + "]");
                if (event.getAction() == MotionEvent.ACTION_DOWN) {
                    WritableMap nativeEvent = Arguments.createMap();
                    nativeEvent.putString("message", "ACTION_DOWN");
                    reactContext.getJSModule(RCTEventEmitter.class).receiveEvent(
                            textView.getId(), "topChange", nativeEvent
                    );
                } 
                return true;
            }
        });
        return textView;
    }
```
关键代码
```
reactContext.getJSModule(RCTEventEmitter.class).receiveEvent(
                            textView.getId(), "topChange", nativeEvent
                    );```
  和自定义module第三种发送事件类似,
**eventName topChange随便写的话，在js中是收不到**
查看UIManagerModuleConstants.java 映射关系 *不明白*

js中接收

```
/**
 * Created by Administrator on 2016/12/7.
 */
import React,{
    Component,PropTypes }
    from 'react';

import {
    requireNativeComponent
    ,Alert
} from 'react-native';

var myTextView = {
    name: 'MyTextView', //MyViewManager getName的返回值
    propTypes: {
        text: PropTypes.string,
        fontSize: PropTypes.number,
        color: PropTypes.number,
        isAlpha: PropTypes.bool,
        backgroundColor: PropTypes.number,

        testID: PropTypes.string,
        accessibilityComponentType: PropTypes.string,
        accessibilityLabel: PropTypes.string,
        accessibilityLiveRegion: PropTypes.string,
        renderToHardwareTextureAndroid: PropTypes.bool,
        importantForAccessibility: PropTypes.string,
        onLayout: PropTypes.bool,
    }
}
//module.exports = requireNativeComponent('MyTextView', myTextView);

var RCTMyView = requireNativeComponent('MyTextView', myTextView, {
    /*能不希望原生专用的属性出现在API之中，也就不希望把它放到propTypes里。
     可是如果你不放的话，又会出现一个报错。解决方案就是带上nativeOnly选项*/
    nativeOnly: {
        onChange: true,
    }
});
class MyView extends Component {
    constructor() {
        super();
    }

    _onChange = (event:Event)=> {
        console.log("_onChange", event);
        if (!this.props.onMyPress) {
            return;
        }
        if (event.nativeEvent.message === 'ACTION_DOWN') {
            this.props.onMyPress();
            return;
        }
    }


    render() {
        /*java发送的是topChange在此接收的是onChange因为在UIManagerModuleConstants.java中定义了映射关系*/
        return 
    }
}
MyView.propTypes = {
    /*propTypes和上面的意思应该差不多*/
    onMyPress: React.PropTypes.func,
}
module.exports = MyView;

```

### 事件 发送自定义事件