Swift UIAlertController.addTextFieldWithConfigurationHandler显示警告“；UICollectionViewFlowLayout的行为未定义"；_Swift_Uialertcontroller

Swift UIAlertController.addTextFieldWithConfigurationHandler显示警告“；UICollectionViewFlowLayout的行为未定义"；

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Swift UIAlertController.addTextFieldWithConfigurationHandler显示警告“；UICollectionViewFlowLayout的行为未定义"；,swift,uialertcontroller,Swift,Uialertcontroller,当我尝试使用addTextFieldWithConfigurationHandler向alertController显示textfeild时，我收到了警告： 2015-12-14 11:03:32.022 TestAlertWithTextField[8455:1172878] the behavior of the UICollectionViewFlowLayout is not defined because: 2015-12-14 11:03:32.022 TestAlertWithTe

当我尝试使用addTextFieldWithConfigurationHandler向alertController显示textfeild时，我收到了警告：

2015-12-14 11:03:32.022 TestAlertWithTextField[8455:1172878] the behavior of the UICollectionViewFlowLayout is not defined because: 2015-12-14 11:03:32.022 TestAlertWithTextField[8455:1172878] the item height must be less than the height of the UICollectionView minus the section insets top and bottom values, minus the content insets top and bottom values. 2015-12-14 11:03:32.023 TestAlertWithTextField[8455:1172878] The relevant UICollectionViewFlowLayout instance is , and it is attached to ; layer = ; contentOffset: {0, 0}; contentSize: {0, 0}> collection view layout: . 2015-12-14 11:03:32.023 TestAlertWithTextField[8455:1172878] Make a symbolic breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes to catch this in the debugger. 你需要打电话

alert.view.setNeedsLayout()

就在之前

self.presentViewController(alert, animated: true, completion: nil)

您是否在应用程序的其他位置使用UICollectionView？此错误似乎不适用于粘贴的代码。相反，您的UICollectionView单元格大小似乎大于屏幕大小。@Patrick Tescher不，我没有使用UICollectionView，只是一个简单的应用程序，在uiviewcontroller上有一个按钮

self.presentViewController(alert, animated: true, completion: nil)