计算使用Swift启动应用程序的次数？ [英] Count number of times app has been launched using Swift?

问题描述

我想计算一下我的iOS应用程序使用Swift启动的次数。

I would like to count the number of times my iOS application has been launched using Swift.

然后我想取数字并使用<$显示它c $ c> NSLog 每次。

I would then like to take the number and display it using NSLog each time.

推荐答案

在 AppDelegate中添加此项 in applicationDidFinishLaunching method。

Add this in AppDelegate in applicationDidFinishLaunching method.

Swift 3和Swift 4：

// get current number of times app has been launched
let currentCount = UserDefaults.standard.integer(forKey: "launchCount")

// increment received number by one
UserDefaults.standard.set(currentCount+1, forKey:"launchCount")

// save changes to disk
UserDefaults.standard.synchronize()

Swift 2 ：

// get current number of times app has been launched
let currentCount = NSUserDefaults.standardUserDefaults().integerForKey("launchCount")

// increment received number by one
NSUserDefaults.standardUserDefaults().setInteger(currentCount+1, forKey:"launchCount")

// save changes to disk 
NSUserDefaults.standardUserDefaults().synchronize()

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