关于react-native组件中navigation在navigationOptions自定义返回事件/触发事件/传递参数

关键属性 headerLeft， navigation.state.params， navigation.setParams

static navigationOptions = ({ navigation }) => {
        return {
            title: '我是一个页面',
            headerStyle: {
                backgroundColor: '#4E86F7',
            },
            headerTintColor: '#fff',
            headerLeft:(
                <TouchableOpacity onPress= {()=>navigation.state.params.handleBack()} >
                    <Image 
                        resizeMode={'contain'} 
                        source={require('../backIcon.png')} 
                        style={{width: 25, height: 25}} />
                </TouchableOpacity>
            )
        }
}

componentDidMount() {
        //componentDidMount阶段在navigation挂载
        this.props.navigation.setParams({handleBack:this._handleAdd})
}
_handleAdd(){
        console.log('我监听了返回键')
}

既然能够设置传递函数，那么传递参数不就更简单了

//有空在写