GPS バックグラウンド キーが原因でアプリが拒否されたのはこれで 2 回目です。私が使用しているコードは次のとおりです。
-(void)stopGPS{
[self.locationManagerAll stopUpdatingLocation];
self.locationManagerAll.delegate = nil;
locationManagerAll = nil;
self.cloop = 1;
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setValue:[NSNumber numberWithBool:NO] forKey:@"UpdateLocation"];
[prefs setValue:[NSNumber numberWithInt:0] forKey:@"updationTime"];
[prefs synchronize];
[set.gpsOnOff setOn:NO];
[set.settingsTable reloadData];
[self stopThread];
}
-(void)startGPS{
if ([CLLocationManager locationServicesEnabled]){
if(self.locationManagerAll == nil){
self.locationManagerAll = [[CLLocationManager alloc] init];
self.locationManagerAll.delegate = self;
}
self.locationManagerAll.desiredAccuracy = kCLLocationAccuracyHundredMeters;
self.locationManagerAll.distanceFilter = kCLDistanceFilterNone;
[self.locationManagerAll startUpdatingLocation];
}else {
[set.gpsOnOff setOn:NO];
[set.settingsTable reloadData];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Location Service Disabled"
message:@"To re-enable, please go to Settings and turn on Location Service for this app."
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
}
}
上記の関数は、GPS 位置情報を開始または停止するために使用されます。GPS 位置情報の実装は次のとおりです。
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
if ([oldLocation.timestamp timeIntervalSinceNow] < - 5) return;
if (newLocation.horizontalAccuracy > 5.0) return;
if (newLocation.coordinate.latitude == oldLocation.coordinate.latitude && newLocation.coordinate.longitude == oldLocation.coordinate.longitude) return;
NSString *currentLatitude = [[NSString alloc]
initWithFormat:@"%f",
newLocation.coordinate.latitude];
NSString *currentLongitude = [[NSString alloc]
initWithFormat:@"%f",
newLocation.coordinate.longitude];
[prefs setValue:currentLatitude forKey:@"UpdateLocationLati"];
[prefs setValue:currentLongitude forKey:@"UpdateLocationLongi"];
[prefs synchronize];
[currentLatitude release];
[currentLongitude release];
if (self.cloop == 1) {
/*UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"Current location saved." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release]; */
self.cloop = 0;
[prefs setValue:[NSNumber numberWithInt:60] forKey:@"updationTime"];
[prefs setValue:[NSNumber numberWithBool:YES] forKey:@"UpdateLocation"];
[prefs synchronize];
[set.gpsOnOff setOn:YES];
[set.settingsTable reloadData];
[self startThread];
}
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
if ([error code] != kCLErrorLocationUnknown) {
[self stopGPS];
UIAlertView *alert = [[UIAlertView alloc] init];
[alert setTitle:@"Location"];
[alert setMessage:@"Unable to get current location"];
[alert setDelegate:self.set];
[alert addButtonWithTitle:@"Cancel"];
[alert addButtonWithTitle:@"Retry"];
[alert show];
[alert release];
}
}
また、毎秒サーバー上の場所を更新するタイマー用のスレッドを使用しています。アプリがバックグラウンドになったときにタイマーが停止するため、次のコードを使用してこれを処理しています。
- (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.*/
if ([[UIDevice currentDevice] respondsToSelector:@selector(isMultitaskingSupported)]) { //Check if our iOS version supports multitasking I.E iOS 4
if ([[UIDevice currentDevice] isMultitaskingSupported]) { //Check if device supports mulitasking
UIApplication *application = [UIApplication sharedApplication]; //Get the shared application instance
__block UIBackgroundTaskIdentifier background_task; //Create a task object
background_task = [application beginBackgroundTaskWithExpirationHandler: ^{
[application endBackgroundTask:background_task];
//Tell the system that we are done with the tasks
background_task = UIBackgroundTaskInvalid; //Set the task to be invalid
//System will be shutting down the app at any point in time now
}];
//Background tasks require you to use asyncrous tasks
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
//Perform your tasks that your application requires
//I do what i need to do here.... synchronously...
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
if ([[prefs objectForKey:@"updationTime"] intValue] > 0 && [[prefs objectForKey:@"UpdateLocation"] boolValue]) {
self.backgroundTimer = [NSTimer timerWithTimeInterval:[[prefs objectForKey:@"updationTime"] intValue] target:self selector:@selector(backgroundTriggerTimer) userInfo:nil repeats:YES];
NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
[runLoop addTimer:backgroundTimer forMode:NSRunLoopCommonModes];
[runLoop run];
}
[application endBackgroundTask:background_task];
//End the task so the system knows that you are done with what you need to perform
background_task = UIBackgroundTaskInvalid; //Invalidate the background_task
});
}else if (![[UIDevice currentDevice] isMultitaskingSupported]) {
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
if ([[prefs objectForKey:@"UpdateLocation"] boolValue]){
[self stopGPS];
}
}
}else if (![[UIDevice currentDevice] isMultitaskingSupported]) {
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
if ([[prefs objectForKey:@"UpdateLocation"] boolValue]){
[self stopGPS];
}
}
}
私が使用しているスレッドコードは次のとおりです。
-(void)startThread
{
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
if ([[prefs objectForKey:@"UpdateLocation"] boolValue]) {
self.updateLocation = [[NSThread alloc] initWithTarget:self selector:@selector(setUpTimerThread) object:nil];
[self.updateLocation start];
}
}
-(void)stopThread{
[self.updateLocation cancel];
updateLocation = nil;
[self.gpsTimer invalidate];
}
-(void)setUpTimerThread
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
if ([[prefs objectForKey:@"updationTime"] intValue] > 0) {
self.gpsTimer = [NSTimer timerWithTimeInterval:[[prefs objectForKey:@"updationTime"] intValue] target:self selector:@selector(triggerTimer) userInfo:nil repeats:YES];
NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
[runLoop addTimer:gpsTimer forMode:NSRunLoopCommonModes];
[runLoop run];
}
[pool release];
}
-(void)triggerTimer
{
NSLog(@"***Timer Called after seconds**");
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
NSString *location = [[[NSString alloc] initWithFormat:@"%f_%f",[[prefs objectForKey:@"UpdateLocationLati"] doubleValue], [[prefs objectForKey:@"UpdateLocationLongi"] doubleValue]] autorelease];
NSString *urlGen = [[[NSString alloc] initWithFormat:@"%@%d/%@",[prefs objectForKey:@"update_user_location"],[[prefs objectForKey:@"USERID"] intValue], location] autorelease];
NSLog(@"urlGen: %@", urlGen);
NSString *rt = [JSONModel stringWithUrl:urlGen];
if (self.alertLoop == 1) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"GPS location has been sent. This alert message will only prompt you once." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
self.alertLoop = 0;
}
NSLog(@"UPDATE LOCATION : %d", [rt intValue]);
}
私は完全に混乱しています。何かを見逃しているかどうかはわかりません。どんな体でも私を助けてください。