苹果系统CLLocationManager获取定位及根据位置获取

本次需求只需要定位到当前位置，拿到粗略的经纬度即可，所以弃用百度地图，直接用苹果自带的CLLocatioManager即可实现。

一、CLLocationManager获取定位

• 1、在info.plist文件里添加 这两个描述 获得用户的允许权限

Privacy - Location When In Use Usage Description -> 是否允许此App在使用期间访问你的位置?

Privacy - Location Always Usage Description -> 是否允许此App永久访问你的位置?

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• 2、添加库 CoreLocation.framework

  
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• 3、下面就是大家最喜欢的部分了- 开始码砖

可以直接在需要的VC中直接写CLLocationManager，也可以分出来写个manager类，这样项目中可以复用

#import <Foundation/Foundation.h>
#import <CoreLocation/CoreLocation.h>

typedef void (^locationInfoBlock) (CLPlacemark *mark, CLLocation *location);

typedef void (^coordinate2DBlock) (NSNumber *latitude, NSNumber *longitude);

@interface SmartCLLocationManager : NSObject

+ (void)startLocation:(locationInfoBlock)location;

@end

#import "SmartCLLocationManager.h"
#import "SmartToast.h"
#import "Util.h"

@interface SmartCLLocationManager ()<CLLocationManagerDelegate>
{
    CLLocationManager *_locationmanager;
    locationInfoBlock locationBlock;
}
@end

@implementation SmartCLLocationManager

+(instancetype)shareManager
{
    static SmartCLLocationManager *manager = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        manager = [[SmartCLLocationManager alloc] init];
    });
    return manager;
}

-(instancetype)init
{
    if (self = [super init]) {
        [self initLocationManager];
    }
    return self;
}

+ (void)startLocation:(locationInfoBlock)location
{
    [[SmartCLLocationManager shareManager] startLocation:location];
}

- (void)startLocation:(locationInfoBlock)location
{
    if (![CLLocationManager locationServicesEnabled]) {
        [self showAlert];
        return;
    }
    locationBlock = [location copy];
    [_locationmanager stopUpdatingLocation];//停止上次定位
    [_locationmanager startUpdatingLocation];//开始新的定位
    
}

- (void)initLocationManager
{
    if ([CLLocationManager locationServicesEnabled]) {
        _locationmanager = [[CLLocationManager alloc] init];
        _locationmanager.delegate = self;
        if ([[[UIDevice currentDevice] systemVersion] doubleValue] > 8.0) {
            [_locationmanager requestWhenInUseAuthorization];//前台定位
//            [_locationmanager requestAlwaysAuthorization];//前后台同时定位
        }

        _locationmanager.desiredAccuracy = kCLLocationAccuracyKilometer;//kCLLocationAccuracyBest比较耗性能
        _locationmanager.distanceFilter = 5.0;
    }else{
        [self showAlert];
    }
}

#pragma mark --- CLLocationManagerDelegate
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations//定位成功
{
    CLLocation *currentLocation = [locations lastObject];
    CLGeocoder *geoCoder = [[CLGeocoder alloc]init];
    //打印当前的经度与纬度
    DLog(@"%f,%f",currentLocation.coordinate.latitude,currentLocation.coordinate.longitude);
    
    //反地理编码
    [geoCoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
        if (placemarks.count > 0) {
            CLPlacemark *placeMark = placemarks[0];
            NSString *currentCity = placeMark.locality;
            if (locationBlock) {
                locationBlock(placeMark,currentLocation);
            }
            /*看需求定义一个全局变量来接收赋值*/
            DLog(@"----%@",placeMark.country);//当前国家
            DLog(@"%@",currentCity);//当前的城市
            DLog(@"%@",placeMark.subLocality);//当前的位置
            DLog(@"%@",placeMark.thoroughfare);//当前街道
            DLog(@"%@",placeMark.name);//具体地址
        }else if (error == nil && placemarks.count == 0){
            DLog(@"没有定位信息");
        }else if (error != nil){
            DLog(@"error");
        }
    }];
    [_locationmanager stopUpdatingHeading];
}

-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error//定位失败
{
    if (locationBlock){
        locationBlock(nil,nil);
    }

    [_locationmanager stopUpdatingLocation];
    if ([error code] == kCLErrorDenied) {//没有授权
        [self showAlert];
    }
    else if ([error code] == kCLErrorLocationUnknown){
        [SmartToast Tost:@"定位数据不可用"];
    }
    else{
        [SmartToast Tost:@"未知错误，定位失败"];
    }
}

-(void)showAlert
{
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"允许定位提示" message:@"请在设置中打开定位" preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"打开定位" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        [Util jumpToWifiSetting];
    }];
    
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
    [alert addAction:okAction];
    [alert addAction:cancelAction];
    [[UIApplication sharedApplication].keyWindow.rootViewController presentViewController:alert animated:YES completion:nil];
}

二、根据位置获取经纬度

+ (void)converAdress:(NSString *)address ToCoordinate2D:(coordinate2DBlock)coordinate;//根据传入的地理位置-->经纬度

+ (void)converAdress:(NSString *)address ToCoordinate2D:(coordinate2DBlock)coordinate//根据传入的地理位置-->经纬度
{
    CLGeocoder *ge = [[CLGeocoder alloc] init];
    [ge geocodeAddressString:address completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
        if ([placemarks count] > 0 && error == nil) {
            CLPlacemark *firstPlacemark = [placemarks objectAtIndex:0];
            NSNumber *latitude = [NSNumber numberWithDouble:firstPlacemark.location.coordinate.latitude];
            NSNumber *longitude = [NSNumber numberWithDouble:firstPlacemark.location.coordinate.longitude];
            coordinate(latitude,longitude);
        }else if ([placemarks count] == 0 && error == nil) {
            DLog(@"Found no placemarks.");
            coordinate(nil,nil);
        }else if (error != nil) {
            DLog(@"An error occurred = %@", error);
            coordinate(nil,nil);
        }
    }];
}

本次就简单介绍一下系统定位，后面再补充上百度地图。