[tipsLabel setTranslatesAutoresizingMaskIntoConstraints:NO];

{

        id view1 = tipsLabel;

        id view2 = self;

        //子view的上边缘离父view的上边缘

        NSLayoutConstraint *contraint1 = [NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:view2 attribute:NSLayoutAttributeTop multiplier:1.0 constant:0.0];

        //子view的左边缘离父view的左边缘

        NSLayoutConstraint *contraint2 = [NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:view2 attribute:NSLayoutAttributeLeft multiplier:1.0 constant:0.0];

        //子view的下边缘离父view的下边缘

        NSLayoutConstraint *contraint3 = [NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:view2 attribute:NSLayoutAttributeBottom multiplier:1.0 constant:-btnHeight];

        //子view的右边缘离父view的右边缘

        NSLayoutConstraint *contraint4 = [NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:view2 attribute:NSLayoutAttributeRight multiplier:1.0 constant:0.0];

        //把约束添加到父视图上

        NSArray *array = [NSArray arrayWithObjects:contraint1, contraint2, contraint3, contraint4, nil,nil];

        [self addConstraints:array];

    }

[imgv setTranslatesAutoresizingMaskIntoConstraints:NO];

    {

        id view1 = imgv;

        id view2 = self.view;

        id viewNil = nil;

        //

        NSLayoutConstraint *contraint1 = [NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:viewNil attribute:NSLayoutAttributeWidth multiplier:1.0 constant:size.width];

        [imgv addConstraint:contraint1];

        //

        NSLayoutConstraint *contraint2 = [NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:viewNil attribute:NSLayoutAttributeHeight multiplier:1.0 constant:size.height];

         [imgv addConstraint:contraint2];

        //子view的下边缘离父view的下边缘

        NSLayoutConstraint *contraint3 = [NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:view2 attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0.0];

        //子view的右边缘离父view的右边缘

        NSLayoutConstraint *contraint4 = [NSLayoutConstraint constraintWithItem:view1 attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:view2 attribute:NSLayoutAttributeRight multiplier:1.0 constant:0.0];

        //把约束添加到父视图上

        NSArray *array = [NSArray arrayWithObjects:contraint3, contraint4, nil,nil];

        [self.view addConstraints:array];

    }