React components defined by Native (cross-file use)

haha ~ ~ ~ today is the introduction of custom components and then go to use this component, let this component pass between the various files haha below start!!!!

What we're going to create is a custom button that first creates a JS file named MyButton, with a touch of background, a function that triggers an event response,

The image resource, and the image size, are determined by the value passed. (The parameters passed in are determined)

Ok!! Below we need to add some native controls (components) to the Mybutton.js file.

import React, {
  AppRegistry,
  Component,
  Image,
  TouchableHighlight,
} from ‘react-native‘;

Then start creating our button Components!!! In general, we'll use a component called Touchablehighlight to package the contents.

class MyButton extends Component {
	render() {
		return (
		<TouchableHighlight   
                       underlayColor={this.props.bgColor}  
                       activeOpacity={0.5} 
                       onPress={this.props.onPress}  
                  >  
		    
			<Image 
                                source={require(‘./res/himi.png‘)} 
				style={ {
                                        width: this.props.imgWidth,
                                        height: this.props.imgHeight
                                 }} 
                         />			
                 </TouchableHighlight> 
		)
	}
}

Which: we should pay attention to this Dongdong ~ this.props Sister's ~ ~ What is this ghost???

In fact, this is not a ghost ~ Popular to say this is an instantiated object for example, I created an object called ' ghost ', then the ghost =this.props , so the property of the ghost is the This.props attribute (method + property)

So, my this.props.xxx and so on wait for the instantiation of "ghost to pass", and then to manipulate the other content .... ?!!

Of course :

Note: There are three possible values for the This.props.children:

A. If the current component has no child nodes, it is undefined;

B. If there is a child node, the data type is object;

C. If there are more than one child node, the data type is array. So be careful when dealing with This.props.children.

Ok! After the component is created, we can go to transform the created component into an outgoing component

Module.exports = MyButton;

Ok!! The code above indicates that you can get this component out of the way! ~~~

Note: You can centralize a number of components on one component and then pass them out

Grand finale:

We can use this component boldly, for example, we use this component in another file:

<MyButton   
            bgColor=‘#000‘
            onPress ={()=>{Alert.alert(‘Himi‘, ‘ MyBtton IS Click! ‘);}}
            imgWidth={100}
            imgHeight={100}
            >  
</MyButton>

It can be seen that many of the attribute parameters are passed to This.props, and then some operations are performed!!!!!

Note: The name of the property must be the same ~ Otherwise this property can not find the ancestors ~ ~

React components defined by Native (cross-file use)