iOS8新特性之基于地理位置的消息通知UILocalNotification

    
     苹果在WWDC2014上正式发布了全新的iOS8操作系统。界面上iOS8与iOS7相比变化不大，不过在功能方面进行了完善。
                               
     iOS8中更新和公开了很多接口，其中有一项本地消息通知UILocalNotification，大家肯定都不陌生。但是在iOS8中对其进行了优化和改进。现在它可以根据地理位置发起消息通知，即我们在App中设置好一个坐标（经纬度）和半径（范围），当装有本App的设备进入本区域后，App就会发出一个消息通知。
   

CLLocationManager *locMan = [[CLLocationManager alloc] init];
locMan.delegate = self;
// request authorization to track the user’s location
[locMan requestWhenInUseAuthorization];

- (void)locationManager:(CLLocationManager *)manager
    didChangeAuthorizationStatus:(CLAuthorizationStatus)status 
{
   // check status to see if we’re authorized
   BOOL canUseLocationNotifications =
         (status == kCLAuthorizationStatusAuthorizedWhenInUse);
   if (canUseLocationNotifications) {
       [self startShowingLocationNotifications];
    }
}

- (void)startShowingNotifications 
{
    UILocalNotification *locNotification = [[UILocalNotification alloc]
                                           init];
    locNotification.alertBody = @“You have arrived!”;
    locNotification.regionTriggersOnce = YES;
    locNotification.region = [[CLCircularRegion alloc]
                           initWithCenter:LOC_COORDINATE
                                   radius:LOC_RADIUS
                               identifier:LOC_IDENTIFIER];
    [[UIApplication sharedApplication]
         scheduleLocalNotification:localNotification];
}
//- (instancetype)initWithCenter:(CLLocationCoordinate2D)center //区域的中心 经纬度
//                            radius:(CLLocationDistance)radius //区域半径   范围
//                        identifier:(NSString *)identifier;    //通知的唯一标示 描述

-(void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
{
    NSLog(@"%s",__func__);
}
- (void)application:(UIApplication *)application didReceiveLocalNotification:
    (UILocalNotification *)notification
{
    CLRegion *region = notification.region;
    if (region)
    {
       [self tellFriendsUserArrivedAtRegion:region];
    }
}