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ViewToken 对象

ViewToken object is returned as one of properties in the onViewableItemsChanged callback, for example in FlatList component. It is exported by ViewabilityHelper.js.

示例

{
item: { key: "key-12" },
key: "key-12",
index: 11,
isViewable: true
}

属性与值

index

Unique numeric identifier assigned to the data element.

TypeOptional
numberYes

isViewable

Specifies if at least some part of list element is visible in the viewport.

TypeOptional
booleanNo

item

Item data

TypeOptional
anyNo

key

Key identifier assigned of the data element extracted to the top level.

TypeOptional
stringNo

section

Item section data when used with SectionList.

TypeOptional
anyYes

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