监听用户进入，离开某个区域，需要请求获取用户的位置，如果想在后台也能监听，需要配置ios9后台监听

////  ViewController.m//  MonitorRegion////  Created by hq on 16/5/17.//  Copyright  2016年 hanqing. All rights reserved.//#import "ViewController.h"#import <CoreLocation/CoreLocation.h>@interface ViewController () <CLLocationManagerDelegate>@property(nonatomic,strong) CLLocationManager *clm;@end@implementation ViewController-(CLLocationManager *)clm{        if (_clm==nil) {        _clm=[[CLLocationManager alloc]init];        _clm.delegate=self;                if ([[UIDevice currentDevice].systemVersion floatValue]>=8.0) {                        [_clm requestAlwaysAuthorization];        }    }    return _clm;}- (void)viewDidLoad {    [super viewDidLoad];        //设置中心点,传经纬度过去    CLLocationCoordinate2D center=CLLocationCoordinate2DMake(37.785834, -122.406417);        //设置监听的区域    CLCircularRegion *region=[[CLCircularRegion alloc] initWithCenter:center radius:1000 identifier:@"hq"];        //开始监听    [self.clm startMonitoringForRegion:region];}-(void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region{        NSLog(@"%@进入该区域",region.identifier);}-(void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region{        NSLog(@"%@离开该区域",region.identifier);}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    }@end