Ios 检查UITextfield的数字间隔
如何检查UITextField中的值是否为介于1到100之间的数字间隔,以及该数字是否在该间隔内,以便将值发送到另一个UIViewController?如果该值不在该时间间隔内,则显示警报 我的另一个控制器有一个Ios 检查UITextfield的数字间隔,ios,swift,uitextfield,Ios,Swift,Uitextfield,如何检查UITextField中的值是否为介于1到100之间的数字间隔,以及该数字是否在该间隔内,以便将值发送到另一个UIViewController?如果该值不在该时间间隔内,则显示警报 我的另一个控制器有一个var receivedValue=“,我将使用它来填充UILabel 这是我的密码: import UIKit class ChildViewController: UIViewController { @IBOutlet weak var insertNumberTextF
var receivedValue=“
,我将使用它来填充UILabel
这是我的密码:
import UIKit
class ChildViewController: UIViewController {
@IBOutlet weak var insertNumberTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
insertNumberTextField.delegate = self
}
@IBAction func checkNumberIntervalButton(_ sender: UIButton) {
if insertNumberTextField.text == "\(1..<100)"{
print("Number is in interval 1 - 100.")
navigationController?.popViewController(animated: true)
dismiss(animated: true, completion: nil)
} else {
let alert = UIAlertController(title: "Try again", message: "Sorry but this numer is not in the inverval 1 - 100. Try again.", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
present(alert, animated: true, completion: nil)
insertNumberTextField.text = ""
print("Number is not in the inverval 1 - 100.")
}
}
}
extension ChildViewController: UITextFieldDelegate {
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
let allowedCharacters = CharacterSet.decimalDigits
let characterSet = CharacterSet(charactersIn: string)
return allowedCharacters.isSuperset(of: characterSet)
}
}
导入UIKit
类ChildViewController:UIViewController{
@IBOutlet弱var insertNumberTextField:UITextField!
重写func viewDidLoad(){
super.viewDidLoad()
insertNumberTextField.delegate=self
}
@iAction func checkNumberIntervalButton(u发件人:UIButton){
如果insertNumberTextField.text=“\(1..将文本字段的文本转换为Int
并进行比较
if let text = insertNumberTextField.text, let value = Int(text), (0 ..< 100).contains(value) {
// number is between 1 and 100
} else {
// show alert
}
如果let text=insertNumberTextField.text,则let value=Int(text),(0..<100).包含(value){
//数字介于1和100之间
}否则{
//显示警惕
}
将文本字段的文本转换为Int
,并以这种方式进行比较
if let text = insertNumberTextField.text, let value = Int(text), (0 ..< 100).contains(value) {
// number is between 1 and 100
} else {
// show alert
}
如果let text=insertNumberTextField.text,则let value=Int(text),(0..<100).包含(value){
//数字介于1和100之间
}否则{
//显示警惕
}
UITextField.text
是一个可选属性,必须展开。它将始终返回“”UITextField.text
是一个可选属性,必须展开。它将始终返回“”