reason: 'couldn't find a common superview for <UIView: 0x7ffc2e303270; frame = (0 0; 0 0); layer = <

reason: 'couldn't find a common superview for <UIView: 0x7ffc2e303270; frame = (0 0; 0 0); layer = <CALayer: 0x7ffc2e3033e0>> and <JTCalendarContentView: 0x7ffc2d81f200; baseClass = UIScrollView; frame = (0 64; 375 72); clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x7ffc2be760c0>; layer = <CALayer: 0x7ffc2bec31f0>; contentOffset: {750, 0}; contentSize: {1875, 72}>'

拉约束的时候，各个控件（有关系的）用的不是一个参照物。我出现这种情况的原因是因为一部分控件用的XIB拉的约束，一部分用的masonry，一个视图用代码写的附在XIB的控件上出现了问题，解决办法，都用XIB，或者代码，或者你找到一个参照物