Question

我正在设计摄影师的应用程序。我添加了一个应用费率窗口。它工作正常，但其增量不起作用。我将其编程为“ 3打开窗口后”。每次我打开应用程序时，控制台都会输出“运行计数= 0”。那是我的问题，我不知道要解决。

let runIncrementerSetting = "numberOfRuns"  // UserDefauls dictionary key where we store number of runs
let minimumRunCount = 3                     // Minimum number of runs that we should have until we ask for review

func incrementAppRuns() {                   // counter for number of runs for the app. You can call this from App Delegate
    let usD = UserDefaults()
    let runs = getRunCounts() + 1
    usD.setValuesForKeys([runIncrementerSetting: runs])
    usD.synchronize()

}

func getRunCounts () -> Int {               // Reads number of runs from UserDefaults and returns it.
    let usD = UserDefaults()
    let savedRuns = usD.value(forKey: runIncrementerSetting)
    var runs = 0
    if (savedRuns != nil) {            
       runs = savedRuns as! Int
    }
    print("Run Counts are \(runs)")
    return runs        
}

func showReview() {        
    let runs = getRunCounts()
    print("Show Review")
    if (runs > minimumRunCount) {
        if #available(iOS 11.0, *) {
            print("Review Requested")
            SKStoreReviewController.requestReview()           
        } else {
            // Fallback on earlier versions
        }
    } else {        
        print("Runs are not enough to request review!")        
    } 
}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    incrementAppRuns()
    return true
}
showReview()

Answer 1

通过“每次我打开应用程序” 确定您确实要重新启动该应用程序吗？（杀死应用程序，然后再次点击应用程序图标）。如果不是，那么didFinishLaunchingWithOptions:将不会呼叫，您将不得不在applicationDidBecomeActive:中处理。

除此之外，在使用UserDefaults时还有另外两个建议

在使用整数值时，请勿使用value(forKey:，而应使用integer(forKey:。
也不要拨打.synchronize()。

以下代码运行正常：

func incrementAppRuns() {
    let usD = UserDefaults.standard
    let runs = getRunCounts() + 1
    usD.set(runs, forKey: runIncrementerSetting)
}

func getRunCounts() -> Int {
    let usD = UserDefaults.standard
    let runs = usD.integer(forKey: runIncrementerSetting)
    print("Run Counts are \(runs)")
    return runs
}

如何在Swift中保存增量

1 个答案: