why my app throw this error unsupported type encoding spec

[xuzhengrong1]

NSGetSizeAndAlignment(): unsupported type encoding spec 'b' at 'b3' in 'b3'

[christyuj]

I also crash in this method NSGetSizeAndAlignment , the type encoding is 'b1' , i will find the reasons later

i find that it crashed when it is finding retain cycle for struct , in my case , the UIView 's struct _viewFlags cause the crash , i will find some way to filter this struct to avoid this crash

[kastiglione]

Thanks for the report. These errors happen when one of the ivars in an object holds a struct that uses bitfields (the b in these errors). There is work planned to prevent this crash exception from happening.

[Gricha]

This is actually an exception breakpoint. If you turn it off in Xcode it should not show up as crash, as well as it should not appear if you are not attached to lldb.

[xuzhengrong1]

I turn off the all exception breakpoint,it's ok. thx