iOS 10获取当前定位信息，根据位置获取天气

iOS 10获取定位，根据位置获取天气

有时候我们在实现类似于日记本，天气预报等效果的时候，总是免不了获取用户手机当前的地理位置，根据位置进行网络请求获取天气预报，然后呈现给用户。iOS 10里面对用户隐私进行了更深入的保护，下面我们来看看iOS系统下的定位与天气。

配置相关设置，导入AFNetWorking第三方库

先在info.plist里面加入Privacy - Location Always Usage Description以及Privacy - Location When In Use Usage Description字段以获取用户手机定位权限。用cocoaPods或者手动导入AFNetWoking框架。

配置三方网络请求类

写一个NetRequest类，继承自NSObject     

NetRequest.h

 #import <Foundation/Foundation.h>

@interface NetRequest : NSObject
//get
+ (void)GET:(NSString *)url parameters:(NSDictionary *)parameters sucess:(void (^)(id responseObject))sucess failure:(void(^)(NSError *error))failure;

//post
+ (void)POST:(NSString *)url parameters:(NSDictionary *)parameters sucess:(void (^)(id responseObject))sucess failure:(void(^)(NSError *error))failure;

@end

NetRequest.m

#import "NetRequest.h"
 #import "AFNetworking.h"
@implementation NetRequest
+ (void)GET:(NSString *)url parameters:(NSDictionary *)parameters sucess:(void (^)(id))sucess failure:(void (^)(NSError *))failure{
    //实例化网络请求管理类
    AFHTTPSessionManager *manger = [AFHTTPSessionManager manager];
    //配置请求超时时间
    manger.requestSerializer.timeoutInterval = 8;
    //配置MIME类型
    manger.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json",@"text/json",@"text/javascript",@"text/html", nil];
    [manger GET:url parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        sucess(responseObject);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        failure(error);
    }];
}
+ (void)POST:(NSString *)url parameters:(NSDictionary *)parameters sucess:(void (^)(id))sucess failure:(void (^)(NSError *))failure{
    //实例化网络请求管理类
    AFHTTPSessionManager *manger = [AFHTTPSessionManager manager];
    //配置请求超时时间
    manger.requestSerializer.timeoutInterval = 8;
    //配置MIME类型
    manger.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json",@"text/json",@"text/javascript",@"text/html", nil];
    [manger POST:url parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        //执行成功
        sucess(responseObject);
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        //执行失败
        failure(error);
    }];
}
@end

主页面实现

主页面代码

#define URL @"http://op.ju.cn/onebox/weather/query?"
#define KEY @"27713e981ae6ac23a93bdd066967"
#import "NetRequest.h"
#import <CoreLocation/CoreLocation.h>      //添加定位服务头文件（不可缺少）
@interface NewRecordViewController ()<CLLocationManagerDelegate>
//定位地址
@property (nonatomic, strong) CLLocationManager *locationManager;//定位服务管理类
@property (nonatomic, assign) NSInteger locationNumber;
@property (nonatomic, strong) NSDictionary *dic;
@end

@implementation ViewController

- (void)viewDidLoad {
     [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    _locationManager = [[CLLocationManager alloc] init];//创建CLLocationManager对象
    _locationManager.delegate = self;//设置代理，这样函数didUpdateLocations才会被回调
    [_locationManager setDesiredAccuracy:kCLLocationAccuracyNearestTenMeters];//精确到10米范围
    [_locationManager requestAlwaysAuthorization];
    [_locationManager startUpdatingLocation]; //启动定位服务
    self.locationNumber = 0;
}

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    // 设备的当前位置
    CLLocation *currLocation = [locations lastObject];

    [_locationManager stopUpdatingLocation];
    CLGeocoder *geocoder = [[CLGeocoder alloc]init];
    [geocoder reverseGeocodeLocation:currLocation completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
        for (CLPlacemark *place in placemarks) {
            NSDictionary *location = [place addressDictionary];
            NSString *city = [location objectForKey:@"City"];
            NSString *subLocality = [location objectForKey:@"SubLocality"];
            NSString *street = [location objectForKey:@"Street"];
            if (city == nil) {
                city = @"";
            }if (subLocality == nil) {
                subLocality = @"";
            }if (street == nil) {
                street = @"";
            }
            self.locationLabel.text = [NSString stringWithFormat:@"%@%@%@",city,subLocality,street];
            if (self.locationNumber == 0) {
                //进行天气网络请求
                self.locationNumber += 1;
                [self dicWithUrl:subLocality subLocality:city];
            }
        }
    }];

}

- (void)dicWithUrl:(NSString *)city subLocality:(NSString *)subLocality{
    NSString *url = [NSString stringWithFormat:@"%@cityname=%@&key=%@",URL,city,KEY];
    NSString *utf8String = [url stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
    [NetRequest GET:utf8String parameters:nil sucess:^(id responseObject) {
        if ([responseObject[@"error_code"] integerValue] == 0) {
            self.dic = responseObject[@"result"][@"data"][@"weather"][0];
            self.temperatureLabel.text = [NSString stringWithFormat:@"%@ %@-%@℃",self.dic[@"info"][@"day"][1],self.dic[@"info"][@"night"][2],self.dic[@"info"][@"day"][2]];
            self.weatherImg.image = IMGNAME(self.dic[@"info"][@"day"][1]);
            self.weatherImgString = self.dic[@"info"][@"day"][1];
        } else {
            if (city.length > 2) {
                [self dicWithUrl:[city substringToIndex:city.length - 1] subLocality:subLocality];
            } else {
                [self dicWithUrl:[subLocality substringToIndex:subLocality.length - 1] subLocality:[subLocality substringToIndex:subLocality.length - 1]];
            }
        }

    } failure:^(NSError *error) {
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"温馨提示" message:@"天气获取失败" preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *a = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        }];
        [alert addAction:a];
        [self presentViewController:alert animated:true completion:nil];

    }];

}

获取天气API是在网络上拿的免费API，各位看官大人就自行处理吧。在获取天气的时候又一些小细节需要处理，我们有时候在得到一个城市的时候，传入API获取数据是获取不了的，需要我们对得到的地址进行操作。我的方法就是一个字一个字的删除，直到API传回数据之后才结束。各位有什么其它更好的方法可以跟我交流。