【iOS知識匯】masonry總結 父控件如何自適應子控件。

父控件如何自適應子控件。

比如 父控件加入了幾個不知寬度在控件。賦值后，我們需要父控件寬度值。那怎么辦？

開發中，對子控件都加入了Mas約束。顯示正常。

    UIView* jdAdview =[UIView new];
    [bottomBarBg addSubview:jdAdview];
    [jdAdview mas_makeConstraints:^(MASConstraintMaker *make) { make.centerY.equalTo(bottomBarBg); make.left.offset(15); }];
父控件沒有指定寬度。結果。父控件寬度是0.顯然不是我要的。
經思考修改：
在子控件最右的約束中加了下面的代碼。結果父控年就有寬度了。

 make.right.equalTo(jdAdview.mas_right);

控件想要有frame值。依賴別人。或者被依賴。

 

 

 //京東報價
    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 = @"京東";
    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);
    }];