应用启动时如何显示警报 [英] How to display an alert when app launches

问题描述

我想在当天首次启动我的应用程序时发出警报. 我认为执行此操作的地方是appDelegate(如果我输入错误，请纠正我).我有两个问题，一个是:我不知道该功能应该驻留在appDelegate中的哪个函数(当前已选择仅是func应用程序)，第二个:我不知道如何向视图呈现alertController开了.到目前为止，我已经做到了

I want to present an alert when my app launches for the first time that day. I think the place to do this is the appDelegate (correct me if i am wrong). I have two problems, one: i don't know which of the functions in the appDelegate the function should reside under (have currently chosen just func application), and second: i don't know how to present the alertController to the view that is open. Thus far i have done this

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    if checkIfNewDay() {
        let alert = UIAlertController("some title": alertTitle, message: "some message", preferredStyle: .Alert)
        alert.addAction(UIAlertAction(title: "Okay", style: .Cancel, handler: nil))

        // What to do here????
    }

我应该用什么代码替换注释?

What code should i replace the comment with?

推荐答案

尝试使用此方法:applicationDidBecomeActive

func applicationDidBecomeActive(application: UIApplication) {
     //This method is called when the rootViewController is set and the view.
    if checkIfNewDay() {
       let alert = UIAlertController("some title": alertTitle, message: "some message", preferredStyle: .Alert)
       alert.addAction(UIAlertAction(title: "Okay", style: .Cancel, handler: nil))
       self.window?.rootViewController?.presentViewController(alert, animated: true, completion: nil)
    }
}

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