iphone-背靠背為事件進(jìn)行投票很長一段時(shí)間以來，我一直在研究一種在我的iPhone應(yīng)用程序中每隔X分鐘輪詢一次數(shù)據(jù)計(jì)數(shù)器的方法。在閱讀了大量的后臺執(zhí)行文檔和一些試用應(yīng)用程序之后，我認(rèn)為在不濫用后臺API的情況下，這是不可能的。上周，我發(fā)現(xiàn)這個應(yīng)用程序就是這么做的。http：/itunes.apple.com/us/app/DataMan-實(shí)時(shí)-數(shù)據(jù)-使用/id3932873？mt=8它在后臺運(yùn)行，并跟蹤您所使用的蜂窩/WiFi數(shù)據(jù)的計(jì)數(shù)。我懷疑開發(fā)人員正在注冊他的應(yīng)用程序以跟蹤位置變化，但是在應(yīng)用程序運(yùn)行時(shí)，位置服務(wù)圖標(biāo)是不可見的，我認(rèn)為這是必需的。有沒有人知道如何做到這一點(diǎn)？
3 回答
白衣染霜花
TA貢獻(xiàn)1796條經(jīng)驗(yàn) 獲得超10個贊
// if the iOS device allows background execution,// this Handler will be called- (void)backgroundHandler {
NSLog(@"### -->VOIP backgrounding callback");
// try to do sth. According to Apple we have ONLY 30 seconds to perform this Task!
// Else the Application will be terminated!
UIApplication* app = [UIApplication sharedApplication];
NSArray* oldNotifications = [app scheduledLocalNotifications];
// Clear out the old notification before scheduling a new one.
if ([oldNotifications count] > 0) [app cancelAllLocalNotifications];
// Create a new notification
UILocalNotification* alarm = [[[UILocalNotification alloc] init] autorelease];
if (alarm)
{
alarm.fireDate = [NSDate date];
alarm.timeZone = [NSTimeZone defaultTimeZone];
alarm.repeatInterval = 0;
alarm.soundName = @"alarmsound.caf";
alarm.alertBody = @"Don't Panic! This is just a Push-Notification Test.";
[app scheduleLocalNotification:alarm];
}}- (void)applicationDidEnterBackground:(UIApplication *)application {
// This is where you can do your X Minutes, if >= 10Minutes is okay.
BOOL backgroundAccepted = [[UIApplication sharedApplication] setKeepAliveTimeout:600 handler:^{ [self backgroundHandler]; }];
if (backgroundAccepted)
{
NSLog(@"VOIP backgrounding accepted");
}}- (void)applicationDidEnterBackground:(UIApplication *)application {
UIApplication* app = [UIApplication sharedApplication];
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
[app endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
}];
// Start the long-running task and return immediately.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// you can do sth. here, or simply do nothing!
// All your background treads and timers are still being executed
while (background)
[self doSomething];
// This is where you can do your "X minutes" in seconds (here 10)
sleep(10);
}
// And never call the expirationHandler, so your App runs
// until the system terminates our process
//[app endBackgroundTask:bgTask];
//bgTask = UIBackgroundTaskInvalid;
}); }最新情況：
UIBackgroundTaskIdentifier bgTask;
// if the iOS device allows background execution,// this Handler will be called- (void)backgroundHandler {
NSLog(@"### -->VOIP backgrounding callback");
UIApplication* app = [UIApplication sharedApplication];
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
[app endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
}];
// Start the long-running task
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
while (1) {
NSLog(@"BGTime left: %f", [UIApplication sharedApplication].backgroundTimeRemaining);
[self doSomething];
sleep(1);
} }); - (void)applicationDidEnterBackground:(UIApplication *)application {
BOOL backgroundAccepted = [[UIApplication sharedApplication] setKeepAliveTimeout:600 handler:^{ [self backgroundHandler]; }];
if (backgroundAccepted)
{
NSLog(@"VOIP backgrounding accepted");
}
UIApplication* app = [UIApplication sharedApplication];
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
[app endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
}];
// Start the long-running task
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
while (1) {
NSLog(@"BGTime left: %f", [UIApplication sharedApplication].backgroundTimeRemaining);
[self doSomething];
sleep(1);
}
}); }更新2：
- (void)applicationDidEnterBackground:(UIApplication *)application {
UIApplication* app = [UIApplication sharedApplication];
// it's better to move "dispatch_block_t expirationHandler"
// into your headerfile and initialize the code somewhere else
// i.e.
// - (void)applicationDidFinishLaunching:(UIApplication *)application {//// expirationHandler = ^{ ... } }
// because your app may crash if you initialize expirationHandler twice.
dispatch_block_t expirationHandler;
expirationHandler = ^{
[app endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
bgTask = [app beginBackgroundTaskWithExpirationHandler:expirationHandler];
};
bgTask = [app beginBackgroundTaskWithExpirationHandler:expirationHandler];
// Start the long-running task and return immediately.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// inform others to stop tasks, if you like
[[NSNotificationCenter defaultCenter] postNotificationName:@"MyApplicationEntersBackground" object:self];
// do your background work here
}); }
鳳凰求蠱
TA貢獻(xiàn)1825條經(jīng)驗(yàn) 獲得超4個贊
什么起作用，什么不起作用
網(wǎng)絡(luò)電話攻擊-工作，但是 將要
如果你不是VOIP應(yīng)用程序，就會被拒絕 遞歸 beginBackgroundTask...-不起作用。10分鐘后它就會退出。即使您嘗試了注釋中的修補(bǔ)程序(至少是截至2012年11月30日的注釋)。 無聲的音頻作品，但是人們因?yàn)檫@個而被拒絕。 本地/推送通知-在您的應(yīng)用程序被喚醒之前需要用戶交互 使用背景位置-作品
..詳情如下：
下面是它的工作原理：
應(yīng)用程序不在后臺運(yùn)行：否 所需背景模式：地點(diǎn)
#import <CoreLocation/CoreLocation.h>CLLocationManager* locationManager = [[CLLocationManager alloc] init]; [locationManager startUpdatingLocation];
startMonitoringSignificantLocationChanges
- 3 回答
- 0 關(guān)注
- 483 瀏覽
添加回答
舉報(bào)
0/150
提交
取消