Swift 比较两个变量时出错
这是我的登录代码。如您所见,我已经预先定义了用户名和密码Swift 比较两个变量时出错,swift,xcode,xcode11,Swift,Xcode,Xcode11,这是我的登录代码。如您所见,我已经预先定义了用户名和密码 import UIKit class ViewController: UIViewController { @IBOutlet var _username: UITextField! @IBOutlet var _password: UITextField! @IBOutlet var _login_button: UIButton! @IBOutlet var label: UILabel!
import UIKit
class ViewController: UIViewController {
@IBOutlet var _username: UITextField!
@IBOutlet var _password: UITextField!
@IBOutlet var _login_button: UIButton!
@IBOutlet var label: UILabel!
let username = "Kiarash"
let password = "Test"
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
@IBAction func LoginButton(_ sender: Any) {
if(_username.text == username && _password.text == password)
{
label.text = "You are Logged in!"
}
}
}
但当我输入正确的用户名和密码时,它会抛出下面的错误
unrecognized selector sent to instance 0x7f8b9450ac60
2020-05-03 19:44:02.481826-0700 KCMLogin[9156:552975] *** Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: '-[UIView setText:]: unrecognized selector sent to instance 0x7f8b9450ac60'
我不知道为什么会发生这种情况,很抱歉我是初学者。从标签中删除当前引用插座,然后将标签重新连接到视图控制器。这意味着标签插座已经弄乱了。@matt我如何修复它?如果值的类型为UITextField!,当它为零时,它变得非常棘手。