如何设置无限循环？

Question

我想建立一个永无止境的循环。

是更好 while true还是while 1==1？

语言：Python。

Answer 1

1 == 1简单地评估为True，所以改为正确并使用

    override func viewDidLoad() {
    super.viewDidLoad()

    currentUsername.text = currentUser?.username
    currentEmail.text = currentUser?.email
    saveButton.isHidden = true

}


func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    textField.resignFirstResponder()
    saveButton.isHidden = false
    return true
}



@IBAction func saveButtonPressed(_ sender: Any) {

    if currentUsername.text != currentUser?.username {

        currentUser?.saveInBackground()
        saveButton.isHidden = true

    }

}