如何检测iOS中首次启动的Apps? [英] How to detect Apps first launch in iOS?

问题描述

当用户第一次打开我的应用程序时，我想显示一个欢迎屏幕.有什么方法可以检查Swift中应用程序的首次启动?

I would like to display a welcome screen when a user opens my app for the first time. What method is there to check the first launch of an app in Swift?

推荐答案

Swift 4和更高版本

func isAppAlreadyLaunchedOnce()->Bool{
    let defaults = UserDefaults.standard
    if let _ = defaults.string(forKey: "isAppAlreadyLaunchedOnce"){
        print("App already launched")
        return true
    }else{
        defaults.set(true, forKey: "isAppAlreadyLaunchedOnce")
        print("App launched first time")
        return false
    }
}

注意:用户重新安装应用并首次启动后，此方法将返回false.

Note: This method would return false after user re-installs app and launch first time.

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