如何在第一次启动应用时显示消息？ [英] How to show a message only the first time an app is launched?

问题描述

是否有一种简单的方法可以在第一次启动应用时显示警报，或者我是否必须通过制作BOOL并在第一次运行后将其设置为FALSE来手动执行此操作？

Is there an easy way to have an alert appear only the first time an app is launched, or will I have to do it manually by making a BOOL and having it set to FALSE after it's run the first time?

推荐答案

听起来很容易......

Sounds easy enough...

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

if(![defaults boolForKey:@"hasBeenLaunchedBefore"]) {
  //Show alert
  [defaults setBool:YES forKey:@"hasBeenLaunchedBefore"];
  [defaults synchronize];
}

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