Swift 3中如何将XIB视图全屏替换添加到视图控制器？

To get your custom XIB view to fully cover the camera session view when the button is tapped, you just need to adjust how you set up the TranslateView's frame and autoresizing behavior in the button tap handler. Here's the updated Swift 3 code:

1. Keep your existing TranslateView implementation (it's already correctly set up) #

import UIKit
class TranslateView: UIView {
    @IBOutlet var TranslateView: UIView!
    
    override init(frame: CGRect){
        super.init(frame: frame)
        commonInit()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        commonInit()
    }
    
    private func commonInit(){
        Bundle.main.loadNibNamed("TranslateView", owner: self, options: nil)
        addSubview(TranslateView)
        TranslateView.frame = self.bounds
        TranslateView.autoresizingMask = [.flexibleHeight, .flexibleWidth]
    }
}

2. Updated ViewController Code (focus on the pressed method) #

import UIKit
import AVFoundation
import Vision

class ViewController: UIViewController, AVCaptureVideoDataOutputSampleBufferDelegate {
    let captureSession = AVCaptureSession()
    let button: UIButton = {
        let button = UIButton()
        button.addTarget(self, action: #selector(pressed(sender:)), for: .touchUpInside)
        button.backgroundColor = UIColor.clear
        button.setTitle("Translate", for: .normal)
        button.translatesAutoresizingMaskIntoConstraints = false
        // Optional: Make button visible over camera feed
        button.setTitleColor(.white, for: .normal)
        button.titleLabel?.font = UIFont.systemFont(ofSize: 18, weight: .semibold)
        return button
    }()

    override func viewDidLoad() {
        super.viewDidLoad()
        setupCaptureSession()
        view.addSubview(button)
        
        // Position button at bottom-center
        NSLayoutConstraint.activate([
            button.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            button.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -50)
        ])
    }

    @objc func pressed(sender: UIButton!) {
        button.removeFromSuperview()
        
        guard let headerView = Bundle.main.loadNibNamed("TranslateView", owner: self, options: nil)?.first as? TranslateView else {
            print("Failed to load TranslateView from XIB")
            return
        }
        
        // Option 1: Frame-based layout (simple for full screen)
        headerView.frame = self.view.bounds
        headerView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        
        // Option 2: Auto layout constraints (uncomment below if preferred)
        /*
        headerView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            headerView.topAnchor.constraint(equalTo: view.topAnchor),
            headerView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            headerView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            headerView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
        ])
        */
        
        self.view.addSubview(headerView)
    }

    // Your camera session setup (added a basic working skeleton)
    func setupCaptureSession() {
        guard let captureDevice = AVCaptureDevice.default(for: .video) else { return }
        do {
            let input = try AVCaptureDeviceInput(device: captureDevice)
            if captureSession.canAddInput(input) {
                captureSession.addInput(input)
            }
            
            let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
            previewLayer.frame = view.bounds
            previewLayer.videoGravity = .resizeAspectFill
            view.layer.addSublayer(previewLayer)
            
            captureSession.startRunning()
        } catch {
            print(error.localizedDescription)
        }
    }

    // Required delegate method (empty implementation for completeness)
    func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
        // Add your frame processing logic here
    }
}

Key Fixes & Improvements: #

• Replaced the fixed 50-height frame with self.view.bounds to make TranslateView fill the entire screen
• Added autoresizingMask to ensure the view adapts to screen rotations or size changes
• Included an optional auto layout approach for more flexible layout control
• Added a safety check with guard to handle XIB loading failures gracefully
• Improved button visibility and positioning over the camera feed

内容的提问来源于stack exchange，提问作者Sieuwe Elferink