自从上次在iOS上打开应用程序多久以来？ [英] How long since last time app was opened in iOS?

问题描述

如何判断我的应用上次开启时的时间？即使我的应用程序没有在后台运行，这仍然可以监控吗？

How can I tell the time from the last time my app was open? Can this still be monitored even my app is not running in the background?

谢谢。

推荐答案

点击

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

两者

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

然后检查启动时的差异：

Then check the difference at startup:

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

两个

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

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