显示当前距离

时间:2014-02-02 22:41:46

标签: objective-c cllocationmanager

我正在尝试获取自LocationManager启动以来已经过的当前距离。但我面临一些问题。

这是我到目前为止的代码:

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
    if (self.startLocation == nil)
    {
        totalDistanceBetween = 0;
        _startLocation = newLocation;
    }
    CLLocationDistance distanceBetween = [newLocation distanceFromLocation:_startLocation ];
    self.startLocation = newLocation;
    totalDistanceBetween += distanceBetween;
    NSString *cycleDistanceString = [[NSString alloc]
                            initWithFormat:@"%f",
                            totalDistanceBetween];
    _CurrentDistance.text = cycleDistanceString;
}


@end

当我运行我的应用程序时,我的标签CurrentDistance根本没有更新。我还是比较新的目标-c所以不确定我哪里出错任何想法?

由于

1 个答案:

答案 0 :(得分:2)

您应该添加日志或调试以确保您接收位置回调。如果没有,您还没有注册更新(正确)。

如果你收到回调,那么我猜_CurrentDistance是一个没有连接的标签的出口(所以你要求nil做某事而没有任何反应。)