React常见问题：error: property 'badge

错误提示：
/Users/gavin/Documents/react/ofodemo/node_modules/react-native/React/Views/RCTTabBarItem.m:111:41: warning: undeclared selector 'badgeColor' [-Wundeclared-selector]

  if ([self.barItem respondsToSelector:@selector(badgeColor)]) {

                                        ^

/Users/gavin/Documents/react/ofodemo/node_modules/react-native/React/Views/RCTTabBarItem.m:112:18: error: property 'badgeColor' not found on object of type 'UITabBarItem *'

    self.barItem.badgeColor = badgeColor;

                 ^

1 warning and 1 error generated.

** BUILD FAILED **

解决方法，你的xcode版本过旧，需要升级。

参考文章：https://github.com/facebook/react-native/issues/14512