iPhone 数字键盘与小数点用于网络应用程序

iPhone 数字键盘与小数点用于网络应用程序

swift
import UIKit
class ViewController: UIViewController {
    @IBOutlet weak var numberTextField: UITextField!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置数字键盘作为输入类型
        numberTextField.keyboardType = .numberPad
    }
    
    @IBAction func submitButtonTapped(_ sender: UIButton) {
        if let input = numberTextField.text, let number = Double(input) {
            // 执行相关操作，如计算、保存数据等
            // ...
            
            // 清空输入框
            numberTextField.text = nil
        } else {
            // 输入无效，给出提示信息
            let alert = UIAlertController(title: "错误", message: "请输入有效的数字", preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: "确定", style: .default, handler: nil))
            present(alert, animated: true, completion: nil)
        }
    }
}

swift
import UIKit
class ViewController: UIViewController {
    @IBOutlet weak var number1TextField: UITextField!
    @IBOutlet weak var number2TextField: UITextField!
    @IBOutlet weak var resultLabel: UILabel!
    
    @IBAction func calculateButtonTapped(_ sender: UIButton) {
        if let input1 = number1TextField.text, let input2 = number2TextField.text,
           let number1 = Double(input1), let number2 = Double(input2) {
            let result = number1 * number2
            resultLabel.text = String(format: "%.2f", result)
        } else {
            resultLabel.text = "输入无效"
        }
    }
}