iphone - 自上次在 iOS 中打开应用程序已有多长时间？

Question

我如何知道上次打开我的应用程序的时间？即使我的应用程序没有在后台运行，这仍然可以被监控吗？

谢谢。

Answer 1

放点像

[[NSUserDefaults standardUserDefaults] setObject:[NSDate date] forKey:@"kLastCloseDate"];

两者皆有

- (void)applicationWillTerminate:(UIApplication *)application
- (void)applicationDidEnterBackground:(UIApplication *)application

然后在启动时检查差异:

NSDate *lastDate = [[NSUserDefaults standardUserDefaults] objectForKey:@"kLastCloseDate"];
NSTimeInterval timeDiff = [[NSDate date] timeIntervalSinceDate:lastDate];
// your stuff

两者皆有

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
- (void)applicationWillEnterForeground:(UIApplication *)application