React-Native AsyncStorage.clear() is failing on IO

问题:

I'm using AsyncStorage.clear() which is working just fine on Android but when run using iOS platform (real device) I'm getting this error and can't find anything online about it.

Error: Failed to delete storage directory.Error Domain=NSCocoaErrorDomain Code=4 "“RCTAsyncLocalStorage_V1” couldn’t be removed." UserInfo={NSFilePath=/var/mobile/Containers/Data/Application/281A6456-6CB2-47D4-AD04-3EB26A1B9506/Documents/RCTAsyncLocalStorage_V1, NSUserStringVariant=(
    Remove
), NSUnderlyingError=0x174049480 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}
Error: Failed to delete storage directory.Error Domain=NSCocoaErrorDomain Code=4 "“RCTAsyncLocalStorage_V1” couldn’t be removed." UserInfo={NSFilePath=/var/mobile/Containers/Data/Application/281A6456-6CB2-47D4-AD04-3EB26A1B9506/Documents/RCTAsyncLocalStorage_V1, NSUserStringVariant=(
    Remove
), NSUnderlyingError=0x174049480 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}
    at convertError (http://192.168.1.33.xip.io:8081/index.ios.bundle?platform=ios&dev=true&minify=false:52255:13)
    at http://192.168.1.33.xip.io:8081/index.ios.bundle?platform=ios&dev=true&minify=false:52109:18
    at MessageQueue.__invokeCallback (http://192.168.1.33.xip.io:8081/index.ios.bundle?platform=ios&dev=true&minify=false:2060:16)
    at http://192.168.1.33.xip.io:8081/index.ios.bundle?platform=ios&dev=true&minify=false:1853:15
    at MessageQueue.__guard (http://192.168.1.33.xip.io:8081/index.ios.bundle?platform=ios&dev=true&minify=false:1991:9)
    at MessageQueue.invokeCallbackAndReturnFlushedQueue (http://192.168.1.33.xip.io:8081/index.ios.bundle?platform=ios&dev=true&minify=false:1852:13)
    at t (file:///Applications/React%20Native%20Debugger.app/Contents/Resources/app.asar/js/RNDebuggerWorker.js:1:14632)

回答1:

I think it's crappy that clear throws an exception when the storage has never been used; at least that is what I'm thinking is the case?

So to move on I modified code removing the use of .clear() and replacing it with AsyncStorage.getAllKeys().then(AsyncStorage.multiRemove)

I'd still like an reason if anyone knows what is going on.

回答2:

When AsyncStorage is empty...

AsyncStorage.clear()
errors on iOS but not Android.

AsyncStorage.getAllKeys().then(AsyncStorage.multiRemove)
errors on Android but not iOS.

My solution...

const asyncStorageKeys = await AsyncStorage.getAllKeys();
if (asyncStorageKeys.length > 0) {
  AsyncStorage.clear();
}