Various pits of the AutoLayout

[_xibview mas_updateconstraints: ^ (masconstraintmaker *make) {

Make. top. Offset(+);

Make. width. Offset(+);

Make. height. Offset(+);

}];

1. AutoLayout to make an animation call the system method

[self. View layoutifneeded];

For example:

[UIView animatewithduration:0.5animations:^{//CGRect rect = _xibview.frame;//RECT.ORIGIN.Y = +;//_xibview.frame = rect;//[_xibview mas_updateconstraints:^ (Masconstraintmaker *Make ) {Make.top.offset ( -); Make.width.offset ( -); Make.height.offset ( -);            }];        [Self.view layoutifneeded]; } Completion:^(BOOL finished) {}];

2. No way to know the true size of this view

3. Difficult to modify or the size and position constraints of this view

Various pits of the AutoLayout