React Native Picker

   var LanguageData = [
            '简体中文',
            'English',
            'Indonesian',
        ]


    <Picker
                style={{
                    marginTop: 20,
                    width: 150,
                    alignSelf: 'center',
                }}
                mode='dropdown'
                prompt='标题，dialog模式才有效果'
                selectedValue={this.state.language}
                onValueChange={(lang) => {
                    this.setState({language: lang})
                }
                }>
                <Picker.Item label="简体中文" value="简体中文"/>
                <Picker.Item label="English" value="English"/>
                <Picker.Item label="Indonesian" value="Indonesian"/>
                {
             //       LanguageData.map(function (value, position) {
            //            return (
            //                <Picker.Item key={position} label={value} value={value}/>
            //            )
            //        })
                }
                {
                    //   LanguageData.map((key, i) => this.renderPicker(key, i))
                }

            </Picker>