วิธีเพิ่ม UISegmentedControl ลง Container View แบบโปรแกรม

สร้าง UISegmentedControl ด้วยโค้ด และเพิ่มลง View Container

โค้ดสร้างและเพิ่ม Segmented Control

func addSegmentedControl() {
    let items = ["First", "Second", "Third"]
    let segmentedControl = UISegmentedControl(items: items)
    
    // ตำแหน่งและขนาด
    segmentedControl.frame = CGRect(x: 20, y: 100, width: view.bounds.width - 40, height: 40)
    
    // สไตล์ (iOS 13+)
    segmentedControl.selectedSegmentIndex = 0
    segmentedControl.backgroundColor = .systemBackground
    segmentedControl.selectedSegmentTintColor = .systemBlue
    
    // Title Attributes
    let normalAttrs: [NSAttributedString.Key: Any] = [
        .font: UIFont.systemFont(ofSize: 14),
        .foregroundColor: UIColor.label
    ]
    let selectedAttrs: [NSAttributedString.Key: Any] = [
        .font: UIFont.boldSystemFont(ofSize: 14),
        .foregroundColor: UIColor.white
    ]
    segmentedControl.setTitleTextAttributes(normalAttrs, for: .normal)
    segmentedControl.setTitleTextAttributes(selectedAttrs, for: .selected)
    
    // Action
    segmentedControl.addTarget(self, action: #selector(segmentChanged(_:)), for: .valueChanged)
    
    // เพิ่มลง Container View
    containerView.addSubview(segmentedControl)
    
    // Auto Layout (แนะนำ)
    segmentedControl.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
        segmentedControl.topAnchor.constraint(equalTo: containerView.topAnchor, constant: 20),
        segmentedControl.leadingAnchor.constraint(equalTo: containerView.leadingAnchor, constant: 20),
        segmentedControl.trailingAnchor.constraint(equalTo: containerView.trailingAnchor, constant: -20),
        segmentedControl.heightAnchor.constraint(equalToConstant: 40)
    ])
}

@objc func segmentChanged(_ sender: UISegmentedControl) {
    switch sender.selectedSegmentIndex {
    case 0: print("First selected")
    case 1: print("Second selected")
    case 2: print("Third selected")
    default: break
    }
    // อัปเดต UI / Container View ตาม Segment
}

ใช้กับ Container View Controller

class ParentViewController: UIViewController {
    var currentChild: UIViewController?
    
    @objc func segmentChanged(_ sender: UISegmentedControl) {
        switchChildViewController(at: sender.selectedSegmentIndex)
    }
    
    func switchChildViewController(at index: Int) {
        // Remove current
        currentChild?.willMove(toParent: nil)
        currentChild?.view.removeFromSuperview()
        currentChild?.removeFromParent()
        
        // Add new
        let newChild: UIViewController
        switch index {
        case 0: newChild = FirstChildVC()
        case 1: newChild = SecondChildVC()
        default: newChild = ThirdChildVC()
        }
        
        addChild(newChild)
        containerView.addSubview(newChild.view)
        newChild.view.frame = containerView.bounds
        newChild.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        newChild.didMove(toParent: self)
        currentChild = newChild
    }
}

Storyboard Alternative

ใช้ Segmented Control ใน Storyboard → เชื่อม IBOutlet + IBAction → จัดการ Container View Embed Segue