MyView.swift

import UIKit
import SnapKit

class MyView: UIView {

    private var _titleLabel: UILabel!
    private var _subTitleLabel: UILabel!
    private var _contentLabel: UILabel!
    
    init(title: String? = nil, subTitle: String? = nil, content: String? = nil) {
        super.init(frame: .zero)
        setupComponents()
        setTitle(title, subTitle: subTitle, content: content)
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupComponents()
    }
    
    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
    }
    
    public func setTitle(_ title: String? = nil, subTitle: String? = nil, content: String? = nil) {
        _titleLabel.text = title
        _subTitleLabel.text = subTitle
        _contentLabel.text = content

        updateFrame()
    }
    
    private func updateFrame() {
        let titleLabelSize = _titleLabel.sizeThatFits(CGSize(width: _titleLabel.frame.width, height: 9999))
        _titleLabel.frame = CGRect(origin: .zero, size: titleLabelSize)
        
        let subTitleLabelSize = _subTitleLabel.sizeThatFits(CGSize(width: _subTitleLabel.frame.width, height: 9999))
        _subTitleLabel.frame = CGRect(origin: .zero, size: subTitleLabelSize)
        
        let contentLabelSize = _contentLabel.sizeThatFits(CGSize(width: _contentLabel.frame.width, height: 9999))
        _contentLabel.frame = CGRect(origin: .zero, size: contentLabelSize)
        
        let frameWidth: CGFloat = self.frame.width
        let frameHeight: CGFloat = _titleLabel.frame.height + _subTitleLabel.frame.height + _contentLabel.frame.height
        self.frame = CGRect(origin: self.frame.origin, size: CGSize(width: frameWidth, height: frameHeight))
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
}