Question

我使用2个textfield作为String，String将数据保存到userDeafults但我想知道如何使用循环或函数检索要显示的所有数据

    let save = UserDefaults.standard

    let heading = headingText.text
    let description = desxriptionTexr.text
    save.set(description, forKey: heading!)

Answer 1

要获取 UserDefaults 中的所有键和相应值，您可以使用：

for (key, value) in UserDefaults.standard.dictionaryRepresentation() {
            print("\(key) = \(value) \n")
}

在 swift 3 中，您可以使用以下方式进行存储和检索：

UserDefaults.standard.setValue(token, forKey: "user_auth_token")
print("\(UserDefaults.standard.value(forKey: "user_auth_token")!)")

Answer 2

我认为这不是一个正确的方法。

我建议您将值放入字典并将字典设置为UserDefaults。

let DictKey = "MyKeyForDictionary"
var userDefaults = UserDefaults.standard

// create your dictionary
let dict: [String : Any] = [
    "value1": "Test",
    "value2": 2
]

// set the dictionary
userDefaults.set(dict, forKey: DictKey)

// get the dictionary
let dictionary = userDefaults.object(forKey: DictKey) as? [String: Any]

// get value from
let value = dictionary?["value2"]


// iterate on all keys
guard let dictionary = dictionary else {
    return
}
for (key, val) in dictionary.enumerated() {

}

Answer 3

您可以在此处将键设置为标题，将值设置为描述。您可以使用$response = array("error" => FALSE); $sl_response["error"] = FALSE; $sl_response["sl_summ"] = array(); $user = $db->getUserByUsernameAndPassword($username, $password); if ($user != null) { // user is found $response["login"]["error"] = FALSE; $response["login"]["user"]["br_code"] = $user["MEMBER_ID_BRCODE"]; $response["login"]["user"]["mem_id"] = $user["MEMBER_ID"]; $response["login"]["user"]["username"] = $user["USERNAME"]; $response["login"]["user"]["email"] = $user["EMAIL"]; $response["login"]["user"]["created_at"] = $user["REG_DATE"]; json_encode($response, true); //Displaying json value echo json_encode($response, true); // FOR SL SUMM $user_sldtl = $db->getUserSLsummary($arclass, $loanclass, $accintreceivable, $date, $year, $month, $br_code, $clientid); If($user_sldtl != null) { for($i = 0; $i < count($user_sldtl); $i++){ $item = array(); $item["sl_desc"] = $user_sldtl[$i][7]; $item["tr_date"] = $user_sldtl[$i][10]; $item["actual_balance"] = $user_sldtl[$i][14]; $item["available_balance"] = $user_sldtl[$i][14]; $sl_response["sl_summ"][] = $item; } $response["accounts"] = $sl_response; json_encode(response); echo json_encode($response, true); } else { $sl_response["error"] = TRUE; $sl_response["error_msg"] = "NO SL Details found!"; echo json_encode($sl_response); } } else { // user is not found with the credentials $response["error"] = TRUE; $response["error_msg"] = "Login credentials are wrong. Please try again!"; json_encode($response); echo json_encode($response); // echo "<br />" .$username. "<br />"; // echo $password; }，UserDefaults.standard.object(forKey:)，UserDefaults.standard.string(forKey: )等函数从userDefaults中检索值。

因此，更好地保存2个不同键的标题和描述可能就像

UserDefaults.standard.value(forKey: )

你可以像

那样检索

let save = UserDefaults.standard
let heading = headingText.text
let description = desxriptionTexr.text
save.set(description, forKey: "description")
save.set(heading, forKey: "heading")

Answer 4

如果您有多个字符串，只需将值保存为数组

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如何在userDefaults swift中循环

4 个答案: