MKMapView 显示当前位置

//显示地图
    MKMapView *mapView = [[MKMapView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
    mapView.showsUserLocation = YES;
    [self.view addSubview:mapView];
    
    //显示当前用户经纬度，自动缩放到1000米
    CLLocationManager *locationManager = [[CLLocationManager alloc] init];//创建位置管理器
    locationManager.delegate=self;//设置代理
    locationManager.desiredAccuracy=kCLLocationAccuracyBest;//指定需要的精度级别
    locationManager.distanceFilter=10.0f;//设置距离筛选器
    [locationManager startUpdatingLocation];//启动位置管理器
    MKCoordinateSpan theSpan;
    
    //地图的范围 越小越精确
    theSpan.latitudeDelta=0.05;
    theSpan.longitudeDelta=0.05;
    MKCoordinateRegion theRegion;
    theRegion.center=[[locationManager location] coordinate];
    theRegion.span=theSpan;
    [mapView setRegion:theRegion];
    [locationManager release];
    
    [mapView release];