Silver Challenge Ch5

iOS Programming (7th Edition) 5. Programmatic Views
1 
import UIKit

class ConversionViewController: UIViewController {
    
    
    // CH3. Challenge
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.

        print("ConversionViewController loaded its view.")
        
        /*Ch 5. Silver*/
        // Create the conversion controller programatically
        // Set the view and its background color
        view = UIView()
        view.backgroundColor = UIColor.systemBackground
        
        // Create labels to add to the view
        let fInput = UILabel()
        let fLabel = UILabel()
        let cOutput = UILabel()
        let cLabel = UILabel()
        let genLabel = UILabel()
        
        // Initilize the label values
        fInput.text = "212"
        fInput.textColor = UIColor.black
        fInput.font = UIFont.systemFont(ofSize: 70)
        fInput.translatesAutoresizingMaskIntoConstraints = false
        
        fLabel.text = "Degrees Fahrenheit"
        fLabel.textColor = UIColor.orange
        fLabel.font = UIFont.systemFont(ofSize: 36)
        fLabel.translatesAutoresizingMaskIntoConstraints = false
        
        genLabel.text = "Is really"
        genLabel.textColor = UIColor.black
        genLabel.font = UIFont.systemFont(ofSize: 30)
        genLabel.translatesAutoresizingMaskIntoConstraints = false
        
        cOutput.text = "100"
        cOutput.textColor = UIColor.black
        cOutput.font = UIFont.systemFont(ofSize: 70)
        cOutput.translatesAutoresizingMaskIntoConstraints = false
        
        cLabel.text = "Degrees Celsius"
        cLabel.textColor = UIColor.orange
        cLabel.font = UIFont.systemFont(ofSize: 36)
        cLabel.translatesAutoresizingMaskIntoConstraints = false
        
        // Add the labels to the view
        view.addSubview(fInput)
        view.addSubview(fLabel)
        view.addSubview(genLabel)
        view.addSubview(cOutput)
        view.addSubview(cLabel)
        
        // Set the constraints for the labels in the view
        let fInputTopConstraint = fInput.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 12)
        let fInputCenterConstraint = fInput.centerXAnchor.constraint(equalTo: view.centerXAnchor)
        
        let fLabelTopConstraint = fLabel.topAnchor.constraint(equalTo: fInput.bottomAnchor, constant: 15)
        let flabelCenterConstraint = fLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor)

        let genLabelTopConstrainat = genLabel.topAnchor.constraint(equalTo: fLabel.bottomAnchor, constant: 15)
        let genLabelCenterConstraint = genLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor)

        let cOutputTopConstraint = cOutput.topAnchor.constraint(equalTo: genLabel.bottomAnchor, constant: 15)
        let cOutputCenterConstraint = cOutput.centerXAnchor.constraint(equalTo: view.centerXAnchor)

        let cLabelTopConstraint = cLabel.topAnchor.constraint(equalTo: cOutput.bottomAnchor, constant: 15)
        let clabelCenterConstraint = cLabel
            .centerXAnchor.constraint(equalTo: view.centerXAnchor)

        // Activate the newly created constraints
        fInputTopConstraint.isActive = true
        fInputCenterConstraint.isActive = true
        
        fLabelTopConstraint.isActive = true
        flabelCenterConstraint.isActive = true
        
        genLabelTopConstrainat.isActive = true
        genLabelCenterConstraint.isActive = true
        
        cOutputTopConstraint.isActive = true
        cOutputCenterConstraint.isActive = true
        
        cLabelTopConstraint.isActive = true
        clabelCenterConstraint.isActive = true
        /*Ch 5. Silver END*/