关于约束
2016-04-18 本文已影响34人
邹邹_ZZ
关于约束
首先 Button.translatesAutoresizingMaskIntoConstraints = NO;
创建完按钮再添加约束
NSLayoutConstraint *constraint = [NSLayoutConstraint constraintWithItem:firstButton attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqualtoItem:self.view attribute:NSLayoutAttributeLeading multiplier:1.0f constant:20.f];
[self.view addConstraint:constraint];
总结一句话：始终遵循下面的规律：
- viewA.attribute = viewB.attributs*multiplier + constant
