SnapKit-style Auto Layout

1import UIKit
2import SnapKit
3 
4class ProfileView: UIView {
5    private let avatarImageView = UIImageView()
6    private let nameLabel = UILabel()
7    private let emailLabel = UILabel()
8    private let bioLabel = UILabel()
9    private let followButton = UIButton(type: .system)
10    
11    override init(frame: CGRect) {
12        super.init(frame: frame)
13        setupViews()
14        setupConstraints()
15    }
16    
17    required init?(coder: NSCoder) {
18        fatalError("init(coder:) has not been implemented")
19    }
20    
21    private func setupViews() {
22        avatarImageView.layer.cornerRadius = 40
23        avatarImageView.clipsToBounds = true
24        
25        nameLabel.font = .boldSystemFont(ofSize: 18)
26        emailLabel.font = .systemFont(ofSize: 14)
27        emailLabel.textColor = .gray
28        bioLabel.numberOfLines = 0
29        
30        [avatarImageView, nameLabel, emailLabel, bioLabel, followButton].forEach { addSubview($0) }
31    }
32    
33    private func setupConstraints() {
34        avatarImageView.snp.makeConstraints { make in
35            make.top.equalToSuperview().offset(16)
36            make.centerX.equalToSuperview()
37            make.size.equalTo(80)
38        }
39        
40        nameLabel.snp.makeConstraints { make in
41            make.top.equalTo(avatarImageView.snp.bottom).offset(12)
42            make.centerX.equalToSuperview()
43        }
44        
45        emailLabel.snp.makeConstraints { make in
46            make.top.equalTo(nameLabel.snp.bottom).offset(4)
47            make.centerX.equalToSuperview()
48        }
49        
50        followButton.snp.makeConstraints { make in
51            make.top.equalTo(emailLabel.snp.bottom).offset(16)
52            make.centerX.equalToSuperview()
53            make.width.equalTo(120)
54            make.height.equalTo(44)
55        }
56    }
57}