When Xcode project set Code Generation Optimization Level and also the user defines a custom getter selector name for the PAPreferences subclass's property, it will crash!!! Because when the gettername was reassigned a new value , the name will release immediately for code optimize.
When Xcode project set Code Generation Optimization Level and also the user defines a custom getter selector name for the PAPreferences subclass's property, it will crash!!! Because when the gettername was reassigned a new value , the name will release immediately for code optimize.

alkozin/PAPreferences,dhennessy/PAPreferences