代碼如下
if(NSUserDefaults.standardUserDefaults().boolForKey("HasLaunchedOnce")) { // app already launched //非首次登陸 } else { // This is the first launch ever //首次登陸 NSUserDefaults.standardUserDefaults().setBool(true, forKey: "HasLaunchedOnce") NSUserDefaults.standardUserDefaults().synchronize() }新聞熱點(diǎn)
疑難解答
