如何在 Swift 中保存增量

Question

我正在设计一个摄影师的应用程序。我添加了应用率 window。它运行良好，但它的增量不是 working.I 为 "After 3 open the window" 编程的。每次我打开应用程序，控制台输出 "run count = 0"。这是我的问题，我不知道如何解决。

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

您确定 "Every time I open the app" 您实际上是在重新启动该应用程序吗？（杀死应用程序并再次点击应用程序图标）。如果不是，则 didFinishLaunchingWithOptions: 将不会调用，您将不得不在 applicationDidBecomeActive: 中处理此问题。

除此之外，在使用 UserDefaults

时还有两个建议

不要使用 value(forKey:，而是在处理整数值时使用 integer(forKey:。
并且不要打电话给 .synchronize()。

以下代码运行良好：

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

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ios

swift