这是什么意思?(https://facebook.github.io/react-native/docs/scrollview)
请记住,滚动视图必须具有一定的高度才能工作
谁必须拥有所谓的边界高度?ScrollView本身?还是它的父母?还是它的孩子?
<SafeAreaView style={{height: ...}}> <= this?
<ScrollView style={{height: ...}}> <= this?
<View style={{height: ...}}> <= this?
....
</View>
</ScrollView>
</SafeAreaView>
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