Coding Club Workshop Code 1

workshop.swift

//
//  ViewController.swift
//  iOSWorkshop
//
//  Created by Richard Wei on 11/6/21.
//

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
       
        self.view.backgroundColor = .black;
        
        print("Screen width = \(self.view.frame.width)")
        print("Screen height = \(self.view.frame.height)")
        
        let screenWidth : CGFloat = self.view.frame.width;
        let screenHeight : CGFloat = self.view.frame.height;
        
        /*
        
        let vSize = 100;
        let vFrame = CGRect(x: Int(screenWidth)/2 - vSize/2, y: Int(screenHeight)/2 - vSize/2, width: vSize, height: vSize);
        let v = UIView(frame: vFrame);
        
        v.backgroundColor = .systemRed;
        
        self.view.addSubview(v);
        
        //
        
        let titleLabelFrame = CGRect(x: Int(screenWidth)/2 - vSize/2, y: Int(screenHeight)/2, width: vSize, height: vSize);
        let titleLabel = UILabel(frame: titleLabelFrame);
        
        titleLabel.text = "Hello!"
        titleLabel.textColor = .black;
        titleLabel.textAlignment = .center;
        titleLabel.font = UIFont(name: titleLabel.font.fontName, size: self.view.frame.width * 0.05);
        
        self.view.addSubview(titleLabel);
        
        //
        
        let imageViewSize = 100;
        let imageViewFrame = CGRect(x: Int(screenWidth) / 2 - imageViewSize / 2, y: 100, width: imageViewSize, height: imageViewSize);
        let imageView = UIImageView(frame: imageViewFrame);
        
        imageView.image = UIImage(systemName: "iphone")
        imageView.tintColor = .black
        //imageView.backgroundColor = .green;
        
        self.view.addSubview(imageView);*/
        
        //
        
        let buttonSize = 100;
        let buttonFrame = CGRect(x: Int(screenWidth)/2 - buttonSize/2, y: Int(screenHeight)/2 - buttonSize/2, width: buttonSize, height: buttonSize);
        let button = UIButton(frame: buttonFrame);
        
        button.backgroundColor = .systemGreen;
        button.setTitle("Button", for: .normal);
        button.setTitleColor(.white, for: .normal);
        
        //button.tag = -1;
        
        button.addTarget(self, action: #selector(handleButtonPress), for: .touchUpInside);
        
        button.layer.cornerRadius = 5;
        
        self.view.addSubview(button);
        
        //
        
    }
    
    @objc func handleButtonPress(twobutton: UIButton){
        print("hello - \(twobutton.tag)")
        
        let page2VC = page2ViewController();
        page2VC.modalTransitionStyle = .crossDissolve;
        page2VC.modalPresentationStyle = .fullScreen;
        
        self.present(page2VC, animated: true);
        
    }


}