作業12#35 換算 App，比方小費，BMI，匯率，單位換算

BMI換算，除了計算BMI值外，還多加了一個LABEL去看BMI值是否符合標準

import UIKit
class ViewController: UIViewController {
    
    @IBOutlet weak var heightTextField: UITextField!
    
    @IBOutlet weak var weightTextField: UITextField!
    
    @IBOutlet weak var BMILabel: UILabel!
@IBOutlet weak var resultLabel: UILabel!
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
@IBAction func calculate(_ sender: UIButton) {
        let heightText = heightTextField.text!
        let weightText = weightTextField.text!
        let height = Double(heightText)
        let weight = Double(weightText)
        let heightMeter = height! / 100
        if height != nil, weight != nil {
            
            let BMI = weight! / (heightMeter * heightMeter)
            BMILabel.text = String(format: "%.1f", BMI)
            view.endEditing(true)
        }
        if weight! / (heightMeter * heightMeter) < 18.5 {
            resultLabel.text = "體重過輕"
        } else if weight! / (heightMeter * heightMeter) < 24  {
            resultLabel.text = "標準"
        } else if weight! / (heightMeter * heightMeter) < 27 {
            resultLabel.text = "過重"
        } else if weight! / (heightMeter * heightMeter) < 30 {
            resultLabel.text = "輕度肥胖"
        } else if weight! / (heightMeter * heightMeter) < 35 {
            resultLabel.text = "中度肥胖"
        } else {
            resultLabel.text = "重度肥胖"
        }
    }
    
}

GitHub - elainelai1007/BMIApp