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.
| Type | Optional |
|---|---|
| number | Yes |
isViewable
Specifies if at least some part of list element is visible in the viewport.
| Type | Optional |
|---|---|
| boolean | No |
item
Item data
| Type | Optional |
|---|---|
| any | No |
key
Key identifier assigned of the data element extracted to the top level.
| Type | Optional |
|---|---|
| string | No |
section
Item section data when used with SectionList.
| Type | Optional |
|---|---|
| any | Yes |