React Native学习－调取摄像头第三方组件：react-native-image-picker

 import ImagePickerManager from ‘NativeModules‘;
 
 当你想展示相机还是相册这个选择器时：（变量options还有其它的设置，一些使用它的默认值就可以满足我们的要求，以下是我使用到的）
var options = {
  title: ‘Select Avatar‘, // 选择器的标题，可以设置为空来不显示标题
  cancelButtonTitle: ‘Cancel‘,
  takePhotoButtonTitle: ‘Take Photo...‘, // 调取摄像头的按钮，可以设置为空使用户不可选择拍照
  chooseFromLibraryButtonTitle: ‘Choose from Library...‘, // 调取相册的按钮，可以设置为空使用户不可选择相册照片
  customButtons: {
    ‘Choose Photo from Facebook‘: ‘fb‘, // [按钮文字] : [当选择这个按钮时返回的字符串]
  },
  mediaType: ‘photo‘, // ‘photo‘ or ‘video‘
  videoQuality: ‘high‘, // ‘low‘, ‘medium‘, or ‘high‘
  durationLimit: 10, // video recording max time in seconds
  maxWidth: 100, // photos only默认为手机屏幕的宽，高与宽一样，为正方形照片
  maxHeight: 100, // photos only
  allowsEditing: false, // 当用户选择过照片之后是否允许再次编辑图片
};
 
ImagePickerManager.showImagePicker(options, (response) => {
  console.log(‘Response = ‘, response);

  if (response.didCancel) {
    console.log(‘User cancelled image picker‘);
  }
  else if (response.error) {
    console.log(‘ImagePickerManager Error: ‘, response.error);
  }
  else if (response.customButton) {
    // 这是当用户选择customButtons自定义的按钮时，才执行
    console.log(‘User tapped custom button: ‘, response.customButton);
  }
  else {
    // You can display the image using either data:

    if (Platform.OS === ‘android‘) {
        source = {uri: response.uri, isStatic: true};
    } else {
        source = {
            uri: response.uri.replace(‘file://‘, ‘‘),
            isStatic: true
        };
    }

    this.setState({
      avatarSource: source
    });
  }
});

// Launch Camera:
  ImagePickerManager.ImagePickerManager.launchCamera(options, (response)  => {
    // Same code as in above section!
  });

  // Open Image Library:
  ImagePickerManager.ImagePickerManager.launchImageLibrary(options, (response)  => {
    // Same code as in above section!
  });