Reload application data when the app comes into fo

问题:

i'm new to iPhone dev ... i'm building an app that loads data from a local sqlite3 db in

-   (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {   

When i tap iPhone button and put it in background and then i recall it i see (as normal) the app in the same way i leaved it. What i would like to do is, when it comes in foregroud, to reload data as if it was called from scratch.

Which is the correct way to do it?

Thanks in advance c.

回答1:

- (void)applicationDidBecomeActive:(UIApplication *)application {
}

Reload the data in the above function of the app delegate to refresh the data when ever the app comes to foreground.

回答2:

So in the App Delegate class - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions will only be called at the first time you enter the app.Then it will call - (void)applicationDidBecomeActive:(UIApplication *)application.

If your iphone iOS is 4.0 or later, when a user click on the home button, it will first invoke - (void)applicationWillResignActive:(UIApplication *)application, then - (void)applicationDidEnterBackground:(UIApplication *)application.

Then the app will run in background till the user kill it. When the user enter the app again, it will first invoke - (void)applicationWillEnterForeground:(UIApplication *)application, then - (void)applicationDidBecomeActive:(UIApplication *)application.

So related to your question, you should call either applicationWillEnterForeground: or applicationDidBecomeActive: to reload your data. Though in the xcode's comment of these methods, Apple suggests use applicationDidBecomeActive: to restart paused tasks and/or update user interface; while in the applicationWillEnterForeground:, you can undo the changes you've made in entering the background.

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So to make it easier to see, i put a number tag to each method. Here's when the method to be called.

0 application:(UIApplication *)application didFinishLaunchingWithOptions: 
1 applicationDidBecomeActive: 
2 applicationWillResignActive: 
3 applicationDidEnterBackground: 
4 applicationWillEnterForeground: 

• First enter the app: call 0, then 1;

• Hit home button: call 2, then 3;

• Double hit home button(multitasking): call 2;

  • if user choose another app or hit home button again: call 3;

  • if user double hit home button again: call 1;

• Enter app again: call 4, then 1;

回答3:

You can exit() your application when iOS notifies it that it should run in the background like so:

- (void)applicationDidEnterBackground:(UIApplication *)application {
  exit(0);
}

回答4:

I think that is the delegate of UIApplication:

- (void)applicationWillEnterForeground:(UIApplication *)application

In iOS 4.0 and later, this method is called as part of the transition from the background to the active state. You can use this method to undo many of the changes you made to your application upon entering the background. The call to this method is invariably followed by a call to the applicationDidBecomeActive: method, which then moves the application from the inactive to the active state.