记录学习RN遇到的报错

格式：【描述】 【截图】 【解决】 【参考】

ios

关键词：EMFILE

【描述】

ERROR Error watching file for changes: EMFILE
{"code":"EMFILE","errno":"EMFILE","syscall":"Error watching file for changes:","filename":null}
Error: Error watching file for changes: EMFILE

at _errnoException (util.js:1041:11)
at FSEvent.FSWatcher._handle.onchange (fs.js:1359:9)

【截图】

【解决】

升级最新MacOS系统后，须要从新安装一次brew install watchman

或者

须要安装watchman

git clone https://github.com/facebook/w...
cd watchman
./autogen.sh
./configure
make
sudo make install

【参考】

https://segmentfault.com/q/10...

android

关键词：override

【描述】

Native module VectorIconsModule tried to override VectorIconsModule for module name RNVectorIconsModule. If this was your intention, set canOverrideExistingModule=true

【截图】

【解决】

找到MainApplication.java(android/app/src/main/java/com)，里面有有重复的引用，把重复的部分删除就好了

import com.oblador.vectoricons.VectorIconsPackage;// 删除
...
public class MainApplication extends Application implements ReactApplication {
    ...
    new VectorIconsPackage(), // 删除
}

【参考】

https://stackoverflow.com/que...

关键词：refs

【描述】

addComponentAsRefTo(...): Only a ReactOwner can have refs. You might be adding a ref to a component that was not created inside a component's render method, or you have multiple copies of React loaded (details: https://fb.me/react-refs-must...

【截图】

【解决】

<View ref={"abcd"}/>  

this.refs.abcd    // 若是在rander以外使用ref就会报错报错

改为：

myRefs = {
    abcd: null
}

<View ref={(abcd) => {this.myRefs.abcd = abcd}}>

this.myRefs.abcd