【发布时间】：2015-06-03 11:30:02
【问题描述】：
我正在执行一项任务，即锁定/解锁计数。当应用程序在前台时工作正常，但在后台不工作。请帮助我
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
[[NSUserDefaults standardUserDefaults]setInteger:0 forKey:@"COUNT"];
[[NSUserDefaults standardUserDefaults]synchronize];
isVAlue=0;
//[self registerAppforDetectLockState];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"kDisplayStatusLocked"];
[[NSUserDefaults standardUserDefaults] synchronize];
MainViewController *mainCtrl=[[MainViewController alloc]initWithNibName:@"MainViewController" bundle:nil];
self.window.rootViewController=mainCtrl;
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
-(void)registerAppforDetectLockState {
int notify_token,countval;
NSString *task=[[NSUserDefaults standardUserDefaults]valueForKey:@"STATE"];
notify_register_dispatch("com.apple.springboard.lockstate", ¬ify_token,dispatch_get_main_queue(), ^(int token)
{
uint64_t state = UINT64_MAX;
notify_get_state(token, &state);
NSLog(@"notify_token %d",token);
if (isVAlue)
{
// notify_cancel(token);
}
if(state == 0) {
isVAlue=YES;
taskName=@"Unlock";
[[NSUserDefaults standardUserDefaults]setValue:taskName forKey:@"STATE"];
[[NSUserDefaults standardUserDefaults]synchronize];
int value=[[[NSUserDefaults standardUserDefaults] valueForKey:@"COUNT"]intValue];
value=value+1;
[[NSUserDefaults standardUserDefaults]setInteger:value forKey:@"COUNT"];
[[NSUserDefaults standardUserDefaults]synchronize];
NSLog(@"value %d",value);
NSLog(@"unlock device");
NSDictionary *incrementVal=@{@"incrementVal":[NSNumber numberWithInt:value]};
[[NSNotificationCenter defaultCenter] postNotificationName:@"HiEverybody" object:self userInfo:incrementVal];
} else {
taskName=@"Lock";
[[NSUserDefaults standardUserDefaults]setValue:taskName forKey:@"STATE"];
[[NSUserDefaults standardUserDefaults]synchronize];
NSLog(@"lock device");
isVAlue=NO;
}
});
}
- (void)applicationDidEnterBackground:(UIApplication *)application {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
UIApplicationState state = [[UIApplication sharedApplication] applicationState];
if (state == UIApplicationStateInactive) {
NSLog(@"Sent to background by locking screen");
[self backgroundTask];
} else if (state == UIApplicationStateBackground) {
if (![[NSUserDefaults standardUserDefaults] boolForKey:@"kDisplayStatusLocked"]) {
NSLog(@"Sent to background by home button/switching to other app");
} else {
NSLog(@"Sent to background by locking screen");
[self backgroundTask];
}
}
}
- (void)applicationWillEnterForeground:(UIApplication *)application {
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
[[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"kDisplayStatusLocked"];
[[NSUserDefaults standardUserDefaults] synchronize];
//[self registerAppforDetectLockState];
}
- (void)applicationDidBecomeActive:(UIApplication *)application {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
- (void)applicationWillTerminate:(UIApplication *)application {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
-(void)backgroundTask
{
UIApplication* application = [UIApplication sharedApplication];
__block UIBackgroundTaskIdentifier background_task;
//Registered a background task, telling the system we need to borrow some events to the system
background_task = [application beginBackgroundTaskWithExpirationHandler:^ {
//[self registerAppforDetectLockState];
//Whether or not complete, the end of background_task task
[application endBackgroundTask: background_task];
background_task = UIBackgroundTaskInvalid;
}];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self registerAppforDetectLockState];
if (TRUE)
{
NSLog(@"running");
}
[application endBackgroundTask: background_task];
background_task = UIBackgroundTaskInvalid;
});
}
请帮助如何在后台模式下连续运行应用程序。 谢谢 德罗纳瓦利
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