Masonry实现动态宽度依赖布局

Masonry 大家都不陌生，现在简单分享下动态宽度使用心得。先简述下问题，如图：

A、C宽度根据文本内容自适应，B距离A、C之间的间距都是10pt。

 

 直接上代码：

1、A、C不设置宽度，其他约束按照正常设置

[self.bgView addSubview:self.leftBtn];
    [self.leftBtn mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.bgView);
        make.top.equalTo(self.bgView.mas_top).offset(15);
        make.height.mas_equalTo(16);
    }];
    
    [self.bgView addSubview:self.rightBtn];
    [self.rightBtn mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.equalTo(self.bgView);
        make.top.equalTo(self.bgView);
        make.height.mas_equalTo(18);
    }];
    
    self.nameLabel = [[UILabel alloc]init];
    self.nameLabel.font = IC_TITLE_FONTNAMEWITHSIZE_16;
    self.nameLabel.textColor = XZWL_COLOR_333333;
    self.nameLabel.textAlignment = NSTextAlignmentLeft;
    [self.bgView addSubview:self.nameLabel];
    [self.nameLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.equalTo(self.rightBtn.mas_left).offset(-10);
        make.left.equalTo(self.leftBtn.mas_right).offset(10);
        make.centerY.equalTo(self.leftBtn);
        make.height.mas_equalTo(16);
    }];

2、在赋值地方设置A、C宽度

 [self.leftBtn setTitle:leftStr forState:UIControlStateNormal];
    CGSize size = [self.leftBtn sizeThatFits:CGSizeZero];
    [self.leftBtn mas_updateConstraints:^(MASConstraintMaker *make) {
        make.width.mas_equalTo(size.width);
    }];
    
    CardDetailList *detailsModel = model.cardDetailList.firstObject;
    self.nameLabel.text = ObjErrorCheck(detailsModel.title);
    
    if (ObjErrorCheck(detailsModel.statusName).length) {
        self.rightBtn.hidden = NO;
        [self.rightBtn setBackgroundColor:[iComeCarrerCircleColorTool getEvaCardStateColor:detailsModel.statusColorType]];
        [self.rightBtn setTitle: ObjErrorCheck(detailsModel.statusName) forState:UIControlStateNormal];
        CGSize size = [self.rightBtn sizeThatFits:CGSizeZero];
        [self.rightBtn mas_updateConstraints:^(MASConstraintMaker *make) {
            make.width.mas_equalTo(size.width);
        }];
    } else {
        self.rightBtn.hidden = YES;
    }