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

2019-11-14 19:53:07

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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];            }        }}];