Question

我有一段时间,显示用户的安保时间。当我看重背景模式时,地点主管和时间主管停止更新。在我评估背景时,如何更新这些内容?

我的看法是,RunViewController已经开了顿。当用户点击该纽顿时,时间和地点管理人员就开始。法典是:

 -(void)startRun{
    timeSec = 0;
    timeMin = 0;
    timeHour = 0;

    NSString* timeNow = [NSString stringWithFormat:@"%02d:%02d:%02d",timeHour , timeMin, timeSec];
    //Display on your label
    lblTime.text = timeNow;

    timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerTick:) userInfo:nil repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];

    self.locManager = [[CLLocationManager alloc] init];
    locManager.delegate = self;
    locManager.desiredAccuracy = kCLLocationAccuracyBest; //kCLLocationAccuracyBest
    [locManager setDistanceFilter:3]; //kCLDistanceFilterNone

    [locManager startUpdatingLocation];
    locationManagerStartDate = [[NSDate date] retain];


}

地点管理者:CLLoc 经理*

简单地从旧地点到新地点绘制地图线,在阵列中拯救这一位置。

提前感谢。

Answer 1

在果树开发论坛的帮助下,找到实现这一目标的解决方案。我做了以下工作:

具体地点背景模式
在背景中使用NStimer
UIApplication:beginBackgroundTaskWithExpirationHandler: 无

smaller than UIApplication:backgroundTimeRemaining it does works just fine, in case n is larger, the location manager should be enabled (and disabled) again before there is no time remaining to avoid the background task being killed. This does work since location is one of the three allowed types of background execution.

注:通过在模拟器中测试这种时间,在拖拉机工作时,用我的电话进行罚款。

此处为。

Answer 2

Try this..

-(void)viewDidLoad
{
    UIDevice* device = [UIDevice currentDevice];
    BOOL backgroundSupported = NO;
    if ([device respondsToSelector:@selector(isMultitaskingSupported)])
        backgroundSupported = device.multitaskingSupported;

    NSLog(backgroundSupported ? @"Yes" : @"No");


    counterTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
     //called after 10min of your app in background
        NSLog(@"10 minutes finished.");
    }];

    theTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(selectorForUpdatingLocation) userInfo:nil repeats:YES];

}

友情链接