使用UIAlertController 报错警告遇到的问题

最新推荐文章于 2021-06-22 11:26:22 发布

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#使用UIAlertController #报错 #警告

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在iOS开发中，遇到UICollectionViewFlowLayout布局错误时，本文提供了解决方案及优化建议，包括更改presentViewController方法调用，避免在 detached view controllers 中显示视图控制器，以及调整item height 参数来满足UICollectionViewFlowLayout 的尺寸约束。

1.使用手机或者模拟器,当型号是6p的时候,会出现以下警告

2016-03-07 14:21:39.076 testInfo[4879:1875194] the behavior of the UICollectionViewFlowLayout is not defined because:

2016-03-07 14:21:39.076 testInfo[4879:1875194] 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.

2016-03-07 14:21:39.078 testInfo[4879:1875194] The relevant UICollectionViewFlowLayout instance is <_UIAlertControllerCollectionViewFlowLayout: 0x15ffd4630>, and it is attached to <UICollectionView: 0x160177400; frame = (0 120.667; 270 44); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x15ffd51c0>; layer = <CALayer: 0x15ffd4d00>; contentOffset: {0, 0}; contentSize: {0, 0}> collection view layout: <_UIAlertControllerCollectionViewFlowLayout: 0x15ffd4630>.

2016-03-07 14:21:39.079 testInfo[4879:1875194] Make a symbolic breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes to catch this in the debugger.

2. Presenting view controllers on detached view controllers is discouraged

这个警告

当使用[self presentViewController:alertC animated:YES completion:nil];的时候会出现

可以更改为

[self.view.window.rootViewController presentViewController:alertC animated:YES completion:nil];