バックグラウンドGPSバックグラウンドを使用したいので、位置情報の更新用にアプリレジスタを設定します。アプリがシステムによって強制終了されないようにしたいのですが、10分でアプリが閉じます。
私のコードは：
#import "AppDelegate.h"
#import "ViewController.h"
@implementation AppDelegate
@synthesize locationManager;
- (void)dealloc
{
[_window release];
[_viewController release];
[super dealloc];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(
NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDir = [paths objectAtIndex:0];
NSString *logPath = [documentDir stringByAppendingPathComponent:@"decrypt.log"];
freopen([logPath cStringUsingEncoding:NSASCIIStringEncoding], "w", stderr);
timer_public = [NSTimer scheduledTimerWithTimeInterval:5*60
target:self
selector:@selector(locationManagerDidTimeout)
userInfo:nil
repeats:YES];
self.locationManager = [[CLLocationManager alloc] init];
[self.locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
//self.locationManager.distanceFilter = kCLDistanceFilterNone; //report all movement
self.locationManager.distanceFilter = 1; //report all movement
self.locationManager.delegate = self;
[self.locationManager startUpdatingLocation];
late=0;
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
-(void)showNotificationWithAlertBody:(NSString *)alertBody object:(id)object objectkey:(NSString *)objectkey{
UILocalNotification *alarm = [[UILocalNotification alloc] init];
if (alarm) {
alarm.fireDate = [NSDate date];
alarm.timeZone = [NSTimeZone defaultTimeZone];
alarm.repeatInterval = 0;
alarm.soundName = UILocalNotificationDefaultSoundName;
alarm.alertBody =[NSString stringWithFormat:@" %f",[[UIDevice currentDevice]batteryLevel]];
// alarm.alertAction
// NSDictionary *infoDic = [NSDictionary dictionaryWithObject:object forKey:objectkey];
// alarm.userInfo = infoDic;
// UIApplication *app = [UIApplication sharedApplication];
// [app scheduleLocalNotification:alarm];
NSLog(@"alarm=%@",alarm);
[[UIApplication sharedApplication] presentLocalNotificationNow:alarm];
}
}
-(NSString *)returnTime_All:(NSDate *)date{
NSDate *dateStr=[NSDate dateWithTimeIntervalSince1970:[date timeIntervalSince1970]];
NSDateFormatter* formatter = [[[NSDateFormatter alloc] init]autorelease] ;
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSString *strDate=[formatter stringFromDate:dateStr];
return strDate;
}
-(void)locationManagerDidTimeout
{
NSLog(@"time=%@", [self returnTime_All:[NSDate date] ] );
}
//retrieve the coordinate
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(@"++++++++++++++++");
NSTimeInterval new=[[NSDate date] timeIntervalSince1970];
NSTimeInterval cha=new-late;
if( cha>=5*60){
// if ([newLocation horizontalAccuracy] > 0.0f && [newLocation horizontalAccuracy] <= 100.0f)
// {
late=[[NSDate date] timeIntervalSince1970]*1;
NSString *strLoc=[NSString stringWithFormat:@"latitude=%f longitude=%f",newLocation.coordinate.latitude,newLocation.coordinate.longitude];
NSData *imgData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:@"www.baidu.com"]];
NSString *str=[[NSString alloc]initWithData:imgData encoding:NSUTF8StringEncoding];
NSLog(@"str=%@",str);
[self showNotificationWithAlertBody:strLoc object:nil objectkey:nil];
}
}
- (void)backgroundHandler {
NSLog(@"### -->backgroundinghandler");
UIApplication* app = [UIApplication sharedApplication];
__block UIBackgroundTaskIdentifier bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
[app endBackgroundTask:bgTask];
bgTask = UIBackgroundTaskInvalid;
}];
// Start the long-running task
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self.locationManager stopMonitoringSignificantLocationChanges];
self.locationManager.delegate=self;
[self.locationManager startUpdatingLocation];
[NSThread sleepForTimeInterval:2];
[self.locationManager stopUpdatingLocation];
});
}
- (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.
*/
// [ self.locationManager stopUpdatingLocation];
// [self.locationManager startMonitoringSignificantLocationChanges];
late=[[NSDate date] timeIntervalSince1970];
BOOL isInBackground = YES;
if ([UIApplication sharedApplication].applicationState == UIApplicationStateBackground)
{
isInBackground = YES;
[self backgroundHandler];
}
}
- (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.
if (self.locationManager==nil) {
self.locationManager = [[CLLocationManager alloc] init];
// self.locationManager.distanceFilter = kCLDistanceFilterNone; //report all movement
[self.locationManager stopMonitoringSignificantLocationChanges];
[self.locationManager setDesiredAccuracy:kCLLocationAccuracyHundredMeters];//精确度
}
[self.locationManager stopMonitoringSignificantLocationChanges];
self.locationManager.delegate=self;
[self.locationManager startUpdatingLocation];
}
- (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:.
NSLog(@"### -->applicationWillTerminate");
}
@end