1.原约束

- (void)makeConstraints {        [self.topContainer mas_makeConstraints:^(MASConstraintMaker *make) {        make.top.equalTo(self);        make.left.right.equalTo(self);        make.height.mas_equalTo(kTopToolHeight);    }];        [self.bottomContainer mas_makeConstraints:^(MASConstraintMaker *make) {        make.bottom.equalTo(self);        make.left.right.equalTo(self);        make.height.mas_equalTo(kBottomToolHeight);    }];}复制代码

2.动画更新约束

- (void)hidTool {        [self setNeedsUpdateConstraints];    [self updateConstraintsIfNeeded];        [UIView animateWithDuration:0.3 animations:^{        [self.topContainer mas_updateConstraints:^(MASConstraintMaker *make) {            make.top.equalTo(self).with.offset(-kTopToolHeight);        }];        [self.bottomContainer mas_updateConstraints:^(MASConstraintMaker *make) {            make.bottom.equalTo(self).with.offset(kBottomToolHeight);        }];                [self layoutIfNeeded];    } completion:^(BOOL finished) {        _isShowTool = NO;        self.topContainer.hidden = YES;        self.bottomContainer.hidden = YES;    }];}复制代码