Uitextfield 通知 xcode 12

Question

uitextfield怎么会出现message must be filled first before it can be executed？我已经搜索 Google 但没找到。

my design

Answer 1

您的意思是显示一条消息，说明在前进之前必须填写文本字段？如果是这样，请在每个 textField

上使用 if 语句

if namaField.text == "" || alamatField.text == "" || phoneField.text == "" {
    let alertController = UIALertController(title: "Enter all fields", preferredStyle: .alert)
    let okayAction = UIAlertAction(title: "Okay", style: .default, handler: { action in
        self.dismiss(animated: true, completion: nil)
    })
    alert.addAction(okayAction)
    self.present(alert, animated: true)
}

Uitextfield 通知 xcode 12

Uitextfield notificaton xcode 12

swift

xcode12