Question

我在oneView控制器中有六个UICollectionView，取决于我想要重新加载集合数据的用户选择状态。我的集合视图应该是水平滚动方向，动态大小单元格。有我的set collectionViewLayout的代码，这个代码在所有IPAD和IPHONE中工作正常，但是IPHONE＆＃34; 5＆＃34; IOS 10及更高版本。当调用第一个集合视图reloadData时，没有show和collectionView（_ collectionView：UICollectionView，cellForItemAt indexPath：IndexPath）不会调用。在下一个collectionView重载数据调用此方法调用和UI更新成功。这个设备有什么问题？

CREATE TABLE dbo.Fubar(
      Code char(6) NOT NULL
    , FullName char(1) NOT NULL
);

INSERT INTO dbo.Fubar VALUES
      ('526010', 'A')
    , ('526011', 'B')
    , ('526012', 'C')
    , ('526013', 'D')
    , ('526020', 'E')
    , ('526021', 'F')
    , ('526022', 'G')
    , ('526110', 'H')
    , ('526111', 'I')
    , ('526112', 'J')
    , ('526510', 'K')
    , ('526511', 'L')
    , ('526512', 'M');
GO

CREATE VIEW dbo.vw_Fubar
AS
SELECT
      a.Code
    , a.FullName
    , SUBSTRING(a.Code, 3, 3) AS gCode
    , CASE
        WHEN RIGHT(Code, 1) = '0' THEN '~' + a.FullName + '~'
        ELSE
            (SELECT '~' + b.FullName FROM dbo.Fubar AS b WHERE b.Code = LEFT(a.Code, 5) + '0') + '~' + a.FullName + '~'
        END AS Team
    , CASE
        WHEN RIGHT(Code, 1) = '0' THEN '~' + SUBSTRING(Code, 3, 3) + '~'
        ELSE
            (SELECT '~' + SUBSTRING(b.Code, 3, 3) FROM dbo.Fubar AS b WHERE b.Code = LEFT(a.Code, 5) + '0') + '~' + RIGHT(a.Code, 4) + '~'
        END AS TeamCode
FROM dbo.Fubar AS a;
GO

SELECT
      Code
    , FullName
    , gCode
    , Team
    , TeamCode
FROM dbo.vw_Fubar
GO

+--------+----------+-------+-------+------------+
|  Code  | FullName | gCode | Team  |  TeamCode  |
+--------+----------+-------+-------+------------+
| 526010 | A        |   601 | ~A~   | ~601~      |
| 526011 | B        |   601 | ~A~B~ | ~601~6011~ |
| 526012 | C        |   601 | ~A~C~ | ~601~6012~ |
| 526013 | D        |   601 | ~A~D~ | ~601~6013~ |
| 526020 | E        |   602 | ~E~   | ~602~      |
| 526021 | F        |   602 | ~E~F~ | ~602~6021~ |
| 526022 | G        |   602 | ~E~G~ | ~602~6022~ |
| 526110 | H        |   611 | ~H~   | ~611~      |
| 526111 | I        |   611 | ~H~I~ | ~611~6111~ |
| 526112 | J        |   611 | ~H~J~ | ~611~6112~ |
| 526510 | K        |   651 | ~K~   | ~651~      |
| 526511 | L        |   651 | ~K~L~ | ~651~6511~ |
| 526512 | M        |   651 | ~K~M~ | ~651~6512~ |
+--------+----------+-------+-------+------------+

Answer 1

我知道问题出在哪里，这是iOS 10中UIKit的一个错误。首先在viewDidLayoutSubviews中调用invalidateLayout

override func viewDidLayoutSubviews() {
    super.viewWillLayoutSubviews()
    collectionView.collectionViewLayout.invalidateLayout()
}

最后在collectionView.reloadData（）

之后调用invalidateLayout

CollectionView collectionViewLayout在第二次重装数据中工作

1 个答案: