XMPP-利用CoreLocation获取地理位置以及CLLocationManager 为什么就不调用代理

最近做基于XMPP的即时通讯，把相关内容总结整理下来看看！

一.利用CoreLocation获取地理位置

利用CoreLocation，必须在frameworks里面加入"CoreLocation.framework",然后类中import <CoreLocation/CoreLocation.h>

1.定义成员变量

#import "LocationHelper.h"

@interface LocationHelper ()<CLLocationManagerDelegate>

{

    CLLocationManager *_locationManager;

}

@property(nonatomic,copy)GetLocationCompledBlock getLocationCompledBlock;

2.实现单例

#pragma mark - shareLocationHelper单例



+ (id)shareLocationHelper{

    static LocationHelper *instance = nil;

    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{

        instance = [[LocationHelper alloc] init];

    });

    return instance;

}

3.进行初始化CLLocationManager位置管理器

- (void)setup {

    _locationManager = [[CLLocationManager alloc] init];

    _locationManager.delegate = self;

    _locationManager.desiredAccuracy = kCLLocationAccuracyBest;

    _locationManager.distanceFilter = 5.0;

    [_locationManager requestAlwaysAuthorization];

}

desiredAccuracy为设置定位的精度，可以设为最优，装置会自动用最精确的方式去定位。

distanceFilter是距离过滤器，为了减少对定位装置的轮询次数，位置的改变不会每次都去通知委托，而是在移动了足够的距离时才通知委托程序，它的单位是米，这里设置为移动5再通知委托处理更新

4.实现外界要求获取位置的请求

- (void)getCurrentGeolocationsCompled:(GetLocationCompledBlock)compled{

    self.getLocationCompledBlock = compled;

    [_locationManager startUpdatingLocation];

}

在此使用startUpdatingLocation启动定位管理了，一般来说，在不需要更新定位时最好关闭它，用stopUpdatingLocation，可以节省电量。

5.实现CLLocationManagerDelegate代理方法获取位置更新信息

#pragma mark - CLLocationManager Delegate



// 代理方法实现

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {

    CLGeocoder* geocoder = [[CLGeocoder alloc] init];

    

    [geocoder reverseGeocodeLocation:newLocation completionHandler:

     ^(NSArray* placemarks, NSError* error) {

         if (self.getLocationCompledBlock) {

             self.getLocationCompledBlock(placemarks);

         }

     }];

    [manager stopUpdatingLocation];

}



- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {

    [manager stopUpdatingLocation];

}

- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status

{

    switch (status) {

        casekCLAuthorizationStatusNotDetermined:

            if ([_locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {

                [_locationManager requestAlwaysAuthorization];

            }

            break;

        default:

            break;

    } 

}

6.控制器中调用方法获取位置信息后加TAG发送

[self.locationHelper getCurrentGeolocationsCompled:^(NSArray *placemarksA) {

        CLPlacemark *placemark = [placemarksA lastObject];

        if (placemark) {

            NSDictionary *addressDictionary = placemark.addressDictionary;

            NSArray *formattedAddressLines = [addressDictionary valueForKey:@"FormattedAddressLines"];

            NSString *geoLocations = [formattedAddressLines lastObject];

            if (geoLocations) {

                //geoLocations===中国****

                [weakSelf didSendGeolocationsMessageWithGeolocaltions:geoLocations];

            }

        }

}];

 

二.CLLocationManager为什么就不调用代理

代码方法开开心心的写完了，但是在发送地理位置消息的时候老是没有消息，郁闷了，断点发现代理根本都没进，最后分析找资料得到解决

上述编码均完成后在Plist文件中添加字段NSLocationAlwaysUsageDescription