'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named NSLayoutConstrain
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转自：http://wangjianlewo.blog.163.com/blog/static/176568051201301551234372/
好像是因为ios6中的xib有AutoLayout这个属性，默认为选中，然后运行在低于ios6.0的机器中，会崩溃，报
*** Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named NSLayoutConstraint'
*** First throw call stack:这个异常。
只需将图片所选中部分，设为不选中即可
- 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named NSLayoutConstrain
- 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named NSLayoutConstrain
- 'NSInvalidUnarchiveOperationException' 'Could not instantiate class named 'NSLayoutConstraint'
- NSInvalidUnarchiveOperationException: Could not instantiate class named NSLayoutConstraint
- reason: ‘Could not instantiate class named NSLayoutConstraint’
- iOS/Xcode异常：reason: ‘Could not instantiate class named NSLayoutConstraint’
- ios6.0以前版本开发 异常信息：reason: ‘Could not instantiate class named NSLayoutConstraint’
- ios6.0以前版本开发 异常信息：reason: ‘Could not instantiate class named NSLayoutConstraint’
- ios6.0以前版本开发 异常信息：reason: ‘Could not instantiate class named NSLayoutConstraint’
- ios6.0以前版本开发 异常信息：reason: ‘Could not instantiate class named NSLayoutConstraint’
- ios6.0以前版本开发 异常信息：reason: ‘Could not instantiate class named NSLayoutConstraint’
- Could not instantiate class named NSLayoutConstraint
- 解决Could not instantiate class named NSLayoutConstraint
- Could not instantiate class named NSLayoutConstraint
- Could not instantiate class named NSLayoutConstraint
- Could not instantiate class named NSLayoutConstraint
- Could not instantiate class named NSLayoutConstraint
- Could not instantiate class named NSLayoutConstraint
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