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!
});