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UIKit Framework

View programmatisch erstellen

So kann man einen Screen nur mit Code erstellen und diesen vom Hauptview aus aufrufen.

SecondViewController.swift

import UIKit

class SecondViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.backgroundColor = .red //Shortcut for UIColor.red
        
        let label = UILabel()
        label.text = "Hello"
        label.frame = CGRect(x: 0, y: 0, width: 100, height: 50)

        // add the label to the view. addSubview needs a view as param. As UILabel inherits from UIView it's possible
        view.addSubview(label) 
        
    }
}

ViewController.swift

//...
    @IBAction func calculatePressed(_ sender: UIButton) {
        let height = round(100 * heightSlider.value)/100
        let weight = round(weightSlider.value)
        let bmi = Int( weight / pow(height,2) )
        
        // show result on SecondViewController
        let secondVC = SecondViewController()
        secondVC.bmiValue = String(format: "%d", bmi)
        self.present(secondVC, animated: true, completion: nil)
    }
//...