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我有一个 iphone 应用程序，每次 gps 获取新位置点时都会记录数据点。

我在我的 APP_NAME-info.plist 中启用了“必需的后台模式”“应用程序注册位置更新”布尔值，但是后台服务接缝停止记录，原因是我无法与我正在做的任何事情相关联，除了设备没有被感动了一段时间。有什么我没有想到的吗？我提供我的代码以防万一。

编辑我在测试时不断移动，因此 gps 应该会更新。

任何指向正确方向的指示都将不胜感激。

  -(void)locationUpdate:(CLLocation *)location
{
    BOOL sc=YES;
    if(!sc){
        UIAlertView *al=[[UIAlertView alloc]initWithTitle:@"you have not got gps enabled" message:@"if you dont allow us access to the gps the this app cant log anything" delegate:self cancelButtonTitle:@"ok" otherButtonTitles: nil] ;
        [al show];
        [al release];
    }

    if (location != nil) {
         gpscylces++;        
       // NSDate* sourceDate = [NSDate date];
        //NSTimeZone* timeZone = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];
        //NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        //[formatter setTimeZone:timeZone];
        //[formatter setDateFormat:@"EEE MMM dd HH:mm:ss zzz yyyy"];

       // NSString *strGMTDate = [formatter stringFromDate:sourceDate];
       // NSLog(@"date : %@", strGMTDate);

        CLLocationCoordinate2D userCoordi = [location coordinate];
        NSString *lat = [NSString stringWithFormat:@"%f",userCoordi.latitude];
        currLat = userCoordi.latitude;
        NSLog(@"lat : %@", lat);
        NSString *log = [NSString stringWithFormat:@"%f",userCoordi.longitude];
        currLog = userCoordi.longitude;
        NSLog(@"log : %@", log);
        currAlt=location.altitude;
        NSDate *date =[NSDate date];
        currTime= [date timeIntervalSince1970];
        int t=(int)currTime;

        NSLog(@"date : %d", t);
        NSString *accuracy = [NSString stringWithFormat:@"%f",location.horizontalAccuracy];
        NSLog(@"accuracy : %@", accuracy);
        NSString *speed = [NSString stringWithFormat:@"%f",[location speed]];
        NSLog(@"speed : %@", speed);
        if (currLat==0&&currLog==0) {
            gpscylces++;
        }
        if(location.horizontalAccuracy>100){
            NSLog(@"----not accurate enaough");
            return;}
        if((!staticshooting)|(staticshooting &(gpscylces==3))){
        [[G4EMADBModel sharedInstance] openDB];
        NSString *strSQL = [NSString stringWithFormat:@"INSERT INTO TRIP_DATA (TRIPID,GMTTIMESTAMP,LATITUDE,LONGITUDE,ALTITUDE,ACCURACY,SPEED, SPECIES, KILLCOUNT) VALUES(%i,%i, %f, %f,%f,%@,%@, NULL, NULL)",currentTripId,t,currLat,currLog,currAlt, accuracy,speed];
            if (waitingForGPS) {
               startlogbtn.titleLabel.text=@"Stop Logging";
                waitingForGPS=NO;
            } 

            if(lastSyncTime+300<currTime)
            {
                 lastSyncTime=currTime;
                [self updateLocationToServer];
            }
            else{NSLog(@"we have synced this last syntime is %f and curtime is %f ",lastSyncTime,currTime);}

        NSLog(@"strQuery : %@", strSQL);
        if (staticshooting) {[CLController.locMgr stopUpdatingLocation];}
        BOOL success=[[G4EMADBModel sharedInstance] executeUpdate:strSQL];
       // [formatter autorelease];
        if (success) {
            NSLog(@"Success");}else{
                NSLog(@"database fail");
        }
        }//static shooting if
    }
}

-(void)locationError:(NSError *)error {

    NSLog(@"Error : %@", [error description]);
}
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