react-native 0.53
react 16.2.0
native-base 2.3.8
Work just fine without warnings (on Debug)
When activating the ActionSheet, the warning its displayed.

both platforms. iOS AND android
On the ActionSheet.js file, the keyExtractor returns the index, but it should return it converted to string
<FlatList
style={{ marginHorizontal: -15, marginTop: 15 }}
data={this.state.items}
keyExtractor={(item, index) => index}
should look:
<FlatList
style={{ marginHorizontal: -15, marginTop: 15 }}
data={this.state.items}
keyExtractor={(item, index) => String(index) }
Fixed with 2.3.9
The same is happening on Picker in ios
We're experiencing this with the Picker on iOS, too.
The problem is unresolved on iOS in the Picker
"native-base": "2.3.9",
"react": "16.2.0",
"react-native": "0.53.3",
@flindenberg @CristiTr this will be fixed in upcoming release
@akhil-geekyants, that's great news. Thank you.
Fixed with NB 2.3.10
Thanks! I can confirm that this issue was resolved.
Most helpful comment
Fixed with NB 2.3.10