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在iOS10上removeAllSubviews后，再调用addArrangedSubview Crash

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
ios, objective-c
Domain
mobile

Research direction

Start by reproducing the sequence of removeAllSubviews followed by addArrangedSubview on iOS 10, using the reported FDStackView assertion as the failure point. Trace the involved layout-constraint operations and determine the cause and a verified resolution for this sequence.

Written by the indexing model from the issue text.

Description

在iOS10上removeAllSubviews后，再调用addArrangedSubview Crash，什么原因？

报错：
Assertion failure in -[FDStackView _layoutEngine_didAddLayoutConstraint:roundingAdjustment:mutuallyExclusiveConstraints:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit/UIKit-3600.7.47/NSLayoutConstraint_UIKitAdditions.m:649
invalid mode 'kCFRunLoopCommonModes' provided to CFRunLoopRunSpecific - break on _CFRunLoopError_RunCalledWithInvalidMode to debug. This message will only appear once per execution.

Dominant language
Objective-C
Stars
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Forks
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