xib写好约束后代码动态修改约束

最新推荐文章于 2020-02-05 23:30:04 发布

原创最新推荐文章于 2020-02-05 23:30:04 发布 · 1.2k 阅读

0 ·

CC 4.0 BY-SA版权

IOS 专栏收录该内容

20 篇文章

订阅专栏

方式一遍历找到xib中的约束修改

for(NSLayoutConstraint *constraint in self.constraints)

{

if (constraint.firstItem==self && constraint.firstAttribute== NSLayoutAttributeLeading) {

constraint.constant=100;

}

方式二全删除重新添加

[self removeConstraints:self.constraints];

[self addConstraint:[NSLayoutConstraint constraintWithItem:self.merchantYHL attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeLeading multiplier:1 constant:10]];

[self addConstraint:[NSLayoutConstraint constraintWithItem:self attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant:70]];