IOS 删除约束

删除所有的

- (void)removeAllAutoLayout{
    [self removeConstraints:self.constraints];
    for (ZLLayoutConstraint *constraint in self.superview.constraints) {
        if ([constraint.firstItem isEqual:self]) {
            [self.superview removeConstraint:constraint];
        }
    }
}

删除单个的约束

- (void)removeAutoLayout:(ZLLayoutConstraint *)constraint{
    for (ZLLayoutConstraint *constraint in self.superview.constraints) {
        if ([constraint isEqual:constraint]) {
            [self.superview removeConstraint:constraint];
        }
    }
}