检测应用程序的第一次运行 [英] Detecting the first ever run of an app

问题描述

我正在创建一个应用程序，当应用程序第一次启动时，我必须创建一个plist。我稍后将使用plist存储用户稍后输入的详细信息。如何检测应用程序的首次启动？我正在尝试使用NSUserDefaults，但我认为我做错了什么。

I am creating an app in which I have to create a plist when the app launches for the first time. I'm later going to use the plist to store details a user later inputs. How can I detect the first launch of the app? I was experimenting with NSUserDefaults but I think I'm doing something wrong.

推荐答案

您可以使用NSUserDefaults执行此操作。但要小心版本号。

You can do this with NSUserDefaults. But be careful with the Version Number.

执行以下操作：

NSString *bundleVersion = [[NSBundle mainBundle] objectForInfoDictionaryKey:(NSString *)kCFBundleVersionKey];

NSString *appFirstStartOfVersionKey = [NSString stringWithFormat:@"first_start_%@", bundleVersion];

NSNumber *alreadyStartedOnVersion = [[NSUserDefaults standardUserDefaults] objectForKey:appFirstStartOfVersionKey];
if(!alreadyStartedOnVersion || [alreadyStartedOnVersion boolValue] == NO) {
    [self firstStartCode];
    [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithBool:YES] forKey:appFirstStartOfVersionKey];
}

选择器firstStartCode只会在每个应用程序版本上按时调用第一次运行。

the selector firstStartCode will only be called on time for each application version on the very first run.

好吗？

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