XMPP-利用CoreLocation獲取地理位置以及CLLocationManager為什么就不調用代理

2019-11-14 19:53:07

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最近做基于XMPP的即時通訊，把相關內容總結整理下來看看！

一.利用CoreLocation獲取地理位置

利用CoreLocation，必須在frameworks里面加入"CoreLocation.framework",然后類中import <CoreLocation/CoreLocation.h>

1.定義成員變量

#import "LocationHelper.h"@interface LocationHelper ()<CLLocationManagerDelegate>{    CLLocationManager *_locationManager;}@PRoperty(nonatomic,copy)GetLocationCompledBlock getLocationCompledBlock;

2.實現單例

#pragma mark - shareLocationHelper單例+ (id)shareLocationHelper{    static LocationHelper *instance = nil;    static dispatch_once_t onceToken;    dispatch_once(&onceToken, ^{        instance = [[LocationHelper alloc] init];    });    return instance;}

3.進行初始化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為設置定位的精度，可以設為最優，裝置會自動用最精確的方式去定位。

distanceFilter是距離過濾器，為了減少對定位裝置的輪詢次數，位置的改變不會每次都去通知委托，而是在移動了足夠的距離時才通知委托程序，它的單位是米，這里設置為移動5再通知委托處理更新

4.實現外界要求獲取位置的請求

- (void)getCurrentGeolocationsCompled:(GetLocationCompledBlock)compled{    self.getLocationCompledBlock = compled;    [_locationManager startUpdatingLocation];}

在此使用startUpdatingLocation啟動定位管理了，一般來說，在不需要更新定位時最好關閉它，用stopUpdatingLocation，可以節省電量。

5.實現CLLocationManagerDelegate代理方法獲取位置更新信息

#pragma mark - CLLocationManager Delegate// 代理方法實現- (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.控制器中調用方法獲取位置信息后加TAG發送

[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===中國****                [weakSelf didSendGeolocationsMessageWithGeolocaltions:geoLocations];            }        }}];