我正在尝试使用样式为.actionSheet的默认AlertViewController。由于某种原因，警报导致约束错误。只要没有通过按钮触发（显示）alertController，整个视图就不会出现约束错误。难道这是Xcode的错误？
我得到的确切错误如下所示：
2019-04-12 15:33:29.584076+0200 Appname[4688:39368] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(
"<NSLayoutConstraint:0x6000025a1e50 UIView:0x7f88fcf6ce60.width == - 16 (active)>"
)
Will attempt to recover by breaking …