Question

我想更新我的listview行，因为我正在尝试对listview数据源进行切片，但是它提出了以下错误：

this.state.dataSource.slice不是一个函数。（在 'this.state.dataSource.slice（）'，'this.state.dataSource.slice'是未定义）

这是我的代码：

let newArray = this.state.dataSource.slice();
newArray[indexToUpdate] = {
  //Here I am updating my values.
};
this.setState({
  dataSource: this.state.dataSource.cloneWithRows(newArray),
});

如果我的代码中有任何错误或我做错了，请告诉我。

Answer 1

Option Explicit Sub List() On Error GoTo Message ActiveSheet.DisplayPageBreaks = False Application.DisplayAlerts = False Application.ScreenUpdating = False Dim objFSO As Object Dim objFolder As Object Dim objFile As Object Dim i As Long Dim i2 As Long Dim i3 As Long Dim j2 As Long Dim name As String Dim Txt As String Set objFSO = CreateObject("Scripting.FileSystemObject") Set objFolder = objFSO.GetFolder("C:\Users\TestMe\Arch") For Each objFile In objFolder.Files Debug.Print objFile Next objFile Application.DisplayAlerts = True Application.ScreenUpdating = True Exit Sub Message: Application.DisplayAlerts = False Exit Sub End Sub不是数组，这就是为什么你不能在dataSource上this.state.dataSource。看起来像这样

slice()

您所需的数组位于该对象的{ _rowHasChanged: [Function: rowHasChanged], _getRowData: [Function: defaultGetRowData], _sectionHeaderHasChanged: [Function], _getSectionHeaderData: [Function: defaultGetSectionHeaderData], _dataBlob: { s1: [ 'row 1', 'row 2' ] }, _dirtyRows: [ [ true, true ] ], _dirtySections: [ true ], _cachedRowCount: 2, rowIdentities: [ [ '0', '1' ] ], sectionIdentities: [ 's1' ] }键中。

注意：它工作正常并使用以下行更新listview dataSource

_dataBlob

React Native slice（）函数未定义错误

1 个答案: