iOS版：使用一个NSUserDefaults的布尔 [英] iOS: Use a boolean in NSUserDefaults

问题描述

在该 RootViewController的我的应用程序的加载，我希望能够检查用户是否登录凭据已保存到 NSUserDefaults的。

When the rootViewController of my application is loaded, I want to be able to check whether or not the users login credentials have been saved to NSUserDefaults.

基本上，当用户加载的申请，他/她没有她的登录凭据保存，一个 modalAlertView 将被推，用户将能够保存他们的凭据正确。这样可以节省那些的UITextField 字符串到相应的 NSUserDefault 对象。但是，它是可能的，当心动做，我可以创建一个 NSUserDefault 对象，它是一个布尔值和值更改为是？

Basically, when the user loads the application and he/she doesn't have her login credentials saved, a modalAlertView will be pushed and the user will be able to save their credentials appropriately. This saves those UITextField strings to a respective NSUserDefault object. However, is it possible, that when this saving is done, I can create an NSUserDefault object which is a boolean and change the value to a yes?

含义与布尔已被设置为无，当用户保存他们的登录凭据，也改变了布尔到是吗？

Meaning that the boolean is already set to no, and when the user saves their login credentials, it also changes the boolean to a yes?

推荐答案

您可以通过设置布尔值：

You can set your boolean by using:

[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"logged_in"];

和使用该code阅读：

and read it by using this code:

if(![[NSUserDefaults standardUserDefaults] boolForKey:@"logged_in"]) {
    [self displayLogin];
} else {
    [self displayMainScreen];
}

这篇关于iOS版：使用一个NSUserDefaults的布尔的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！