MyView2.swift

    private func setupComponents() {
        _titleLabel = UILabel(frame: .zero)
        _titleLabel.textColor = UIColor.black
        _titleLabel.numberOfLines = 0
        _titleLabel.backgroundColor = UIColor.red
        addSubview(_titleLabel)

        _subTitleLabel = UILabel(frame: .zero)
        _subTitleLabel.textColor = UIColor.black
        _subTitleLabel.numberOfLines = 0
        _subTitleLabel.backgroundColor = UIColor.green
        addSubview(_subTitleLabel)

        _contentLabel = UILabel(frame: .zero)
        _contentLabel.textColor = UIColor.black
        _contentLabel.numberOfLines = 0
        _contentLabel.backgroundColor = UIColor.yellow
        addSubview(_contentLabel)

        _titleLabel.snp.makeConstraints { (make) in
            make.leading.top.trailing.equalToSuperview()
            make.height.greaterThanOrEqualTo(0)
        }

        _subTitleLabel.snp.makeConstraints { (make) in
            make.top.equalTo(self._titleLabel.snp.bottom)
            make.leading.trailing.equalToSuperview()
            make.height.greaterThanOrEqualTo(0)
        }

        _contentLabel.snp.makeConstraints { (make) in
            make.top.equalTo(self._subTitleLabel.snp.bottom)
            make.leading.trailing.equalToSuperview()
            make.bottom.equalToSuperview()
        }

        self.backgroundColor = UIColor.blue
    }