自从上次在iOS上打开应用程序多久以来？

Question

如何判断我的应用程序上次打开时的时间？即使我的应用程序没有在后台运行,这仍然可以监控吗？

谢谢.

Answer 1

放点像

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

同时

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

然后检查启动时的差异:

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

同时

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