2018-07-04 11:16:05.379131+0800 JDD[18217:10684181] [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. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) ( "", "", "", "", "")Will attempt to recover by breaking constraintMake a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in may also be helpful.

Legend:

* - is laid out with auto layout

+ - is laid out manually, but is represented in the layout engine because translatesAutoresizingMaskIntoConstraints = YES

• - layout engine host

查找：

ObjC项目添加 po [[UIWindow keyWindow] _autolayoutTrace]

或者为你的Swift项目添加 expr -l objc++ -O -- [[UIWindow keyWindow] _autolayoutTrace]

解决：

xView.translatesAutoresizingMaskIntoConstraints=NO;