How to debug autolayout constraint error

(lldb) po [0x7fc82aba1210 recursiveDescription]
<UIView: 0x7fc82aba1210; frame = (0 0; 768 359); autoresize = RM+BM; layer = <CALayer: 0x7fc82d338960>>
| <MYAPPButton: 0x7fc82d61c800; baseClass = UIButton; frame = (0 0; 768 359); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x7fc82ab96570>>
| | <UIImageView: 0x7fc82d3f7b10; frame = (0 0; 0 0); clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x7fc82d6e7020>>
| <UIImageView: 0x7fc82d54a1c0; frame = (314 110; 140 140); autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x7fc82d52def0

add symbolic breakpoint and fire po command to get the hierarchy.

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