Masonry 自适应系列

这个是自适应Label的宽度

 _titleLabel = [[UILabel alloc]init];

    _titleLabel.textAlignment = NSTextAlignmentCenter;

    _titleLabel.textColor = [UIColor whiteColor];

    _titleLabel.font = [UIFont systemFontOfSize:15];

    _titleLabel.preferredMaxLayoutWidth = 195;

    [_titleLabel setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisHorizontal];

    [self addSubview:_titleLabel];

    [_titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {

        make.centerX.equalTo(self.mas_centerX);

        make.top.equalTo(self.mas_top);

        make.height.offset(30);

    }];