ios - 在UIAlertController中添加UITextField控制台报错

Question

我实现了如图所示的警示框。（警示框中包含输入框）

实现代码如下

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"test" message:@"test" preferredStyle:UIAlertControllerStyleAlert];
            [alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
                textField.placeholder = @"test";
                textField.adjustsFontSizeToFitWidth = YES;
            }];
            UIAlertAction *cancleAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
                NSLog(@"test");
            }];
            [alertController addAction:cancleAction];
            [self presentViewController:alertController animated:YES completion:nil];

但是在运行时每当点击弹出警示框的时候，控制台都会报这样的错误：

the behavior of the UICollectionViewFlowLayout is not defined because:
2016-01-04 22:39:43.136 temp[1819:71277] 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.
2016-01-04 22:39:43.137 temp[1819:71277] The relevant UICollectionViewFlowLayout instance is <_UIAlertControllerCollectionViewFlowLayout: 0x7fb81d169b70>, and it is attached to <UICollectionView: 0x7fb81c10d800; frame = (0 120.667; 270 44); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x7fb81d18d800>; layer = <CALayer: 0x7fb81ae37510>; contentOffset: {0, 0}; contentSize: {0, 0}> collection view layout: <_UIAlertControllerCollectionViewFlowLayout: 0x7fb81d169b70>.
2016-01-04 22:39:43.137 temp[1819:71277] Make a symbolic breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes to catch this in the debugger.

这是为什么呢？

Answer 1

I found the answer on stack overflow. This prompt will only appear on the console when the simulator selects iPhone6plus and iPhone6splus. This problem will not occur when other simulators are selected. This is a bug of Apple#🎜 🎜#

Answer 2

He asked you to hit a breakpoint and take a look. Have you tried it?

Answer 3

Is the height of your UICollectionViewFlowLayout subclass folw higher than the height of UICollectionView?