1"This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes"
屏幕快照 2017-07-25 下午6.17.39.png
2.Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x191f0920 H:[MPKnockoutButton:0x17a876b0]-(34)-MPDetailSlider:0x17a8bc50>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
屏幕快照 2017-07-25 下午6.18.01.png
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