【iOS知识汇】masonry总结 父控件如何自适应子控件。

父控件如何自适应子控件。

比如 父控件加入了几个不知宽度在控件。赋值后，我们需要父控件宽度值。那怎么办？

开发中，对子控件都加入了Mas约束。显示正常。

    UIView* jdAdview =[UIView new];
    [bottomBarBg addSubview:jdAdview];
    [jdAdview mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.equalTo(bottomBarBg);
        make.left.offset(15);
    }];
父控件没有指定宽度。结果。父控件宽度是0.显然不是我要的。
经思考修改：
在子控件最右的约束中加了下面的代码。结果父控年就有宽度了。

  make.right.equalTo(jdAdview.mas_right);

控件想要有frame值。依赖别人。或者被依赖。

 //京东报价
    UIView* jdAdview =[UIView new];
    [bottomBarBg addSubview:jdAdview];
    [jdAdview mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.equalTo(bottomBarBg);
        make.left.offset(15);
    }];
    
    UIImageView*ivIcJd = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"jd_logo"]];
    [jdAdview addSubview:ivIcJd];
    
    [ivIcJd mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.equalTo(jdAdview);
        make.left.equalTo(bottomBarBg).offset(15);
    }];
    
    UILabel *lbJd = [[UILabel alloc] init];
    lbJd.text = @"京东";
    lbJd.font = [UIFont systemFontOfSize :14];
    lbJd.textColor = [UIColor colorWithRed:71/255.0 green:71/255.0 blue:71/255.0 alpha:1/1.0];
    [jdAdview addSubview:lbJd];
    
    UILabel *lbMoeny = [[UILabel alloc] init];
    lbMoeny.text = @"￥";
    lbMoeny.font = [UIFont systemFontOfSize:11];
    lbMoeny.textColor = [UIColor colorWithRed:236/255.0 green:47/255.0 blue:47/255.0 alpha:1/1.0];
    [jdAdview addSubview:lbMoeny];
    
    UILabel *lbPrice = [[UILabel alloc] init];
    lbPrice.frame = CGRectMake(90, 1026, 39, 22);
    lbPrice.text = @"3168";
    lbPrice.font = [UIFont systemFontOfSize:16];
    lbPrice.textColor = [UIColor colorWithRed:236/255.0 green:47/255.0 blue:47/255.0 alpha:1/1.0];
    
    [jdAdview addSubview:lbPrice];
    
    
    [lbJd mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.equalTo(jdAdview);
        make.left.equalTo(ivIcJd.mas_right).offset(10);
    }];
    
    [lbMoeny mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.equalTo(jdAdview).offset(2);
        make.left.equalTo(lbJd.mas_right).offset(6);
    }];
    
    [lbPrice mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.equalTo(jdAdview);
        make.left.equalTo(lbMoeny.mas_right);
        make.right.equalTo(jdAdview.mas_right);
    }];