定位当前城市并获取天气信息

2016-12-16  本文已影响0人  蜂蜜柚子茶v

一、首先,说一下怎么定位当前城市

可能定位城市有很多做法,我只写一种我在项目中应用的

注意:我们需要打开info.plist文件添加定位权限的说明,否则程序在iOS10上会出现崩溃。

<!-- 位置 --> 
<key>NSLocationUsageDescription</key> 
<string>App需要您的同意,才能访问位置</string> 
<!-- 在使用期间访问位置 --> 
<key>NSLocationWhenInUseUsageDescription</key> 
<string>App需要您的同意,才能在使用期间访问位置</string> 
<!-- 始终访问位置 --> 
<key>NSLocationAlwaysUsageDescription</key> 
<string>App需要您的同意,才能始终访问位置</string>

iOS10其他权限设置

1、我们需要导入框架

#import <CoreLocation/CoreLocation.h>

2、设置代理并声明一个全局变量,因为这个城市变量在获取天气的时候要用

@interface MainAppViewController ()<CLLocationManagerDelegate>{
    NSString * currentCity; //当前城市
}

3、接下来就是重点了,直接上代码,注释很全

//判断定位服务是否打开
    if(![CLLocationManager locationServicesEnabled])
    {
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"定位服务未打开" preferredStyle:UIAlertControllerStyleAlert];
        //创建按钮
        //handler:点击按钮执行的事件
        UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:nil];
        [alert addAction:action];
        [self presentViewController:alert animated:YES completion:nil];
        return;
    }
    
    self.locationManager = [[CLLocationManager alloc]init];
    //iOS8之后需要请求权限
    //判断当前手机系统是否高于8.0
    if([UIDevice currentDevice].systemVersion.floatValue >= 8.0)
    {
        //请求使用期间访问位置信息权限
        [self.locationManager requestWhenInUseAuthorization];
        //请求一直访问位置信息权限
        //[locationManager requestAlwaysAuthorization];
    }
    //定位精度 kCLLocationAccuracyBest:最精确
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    //多少米之外去更新用户位置
    //locationManager.distanceFilter = 100;
    //设置代理
    self.locationManager.delegate = self;
    //开始定位
    [self.locationManager startUpdatingLocation];
    NSLog(@"开始定位");

4、接下来就是代理方法了

定位失败
//定位失败则执行此代理方法
//定位失败弹出提示框,点击"打开定位"按钮,会打开系统的设置,提示打开定位服务
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
    
    NSLog(@"定位失败");
    UIAlertController * alertVC = [UIAlertController alertControllerWithTitle:@"允许\"定位\"提示" message:@"请在设置中打开定位" preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction * ok = [UIAlertAction actionWithTitle:@"打开定位" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        //打开定位设置
        NSURL *settingsURL = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
        [[UIApplication sharedApplication] openURL:settingsURL];
    }];
    UIAlertAction * cancel = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        
    }];
    
    [alertVC addAction:cancel];
    [alertVC addAction:ok];
    [self presentViewController:alertVC animated:YES completion:nil];
    
}
定位成功

定位成功,获取到当前所在城市,也可以得到具体坐标,因为我要用城市去获取天气信息,所以我只拿到城市名字就可以了

//定位成功
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations {
    NSLog(@"定位成功");
    [self.locationManager stopUpdatingLocation];
    CLLocation *currentLocation = [locations lastObject];
    CLGeocoder * geoCoder = [[CLGeocoder alloc] init];
    
    //反编码
    [geoCoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
        if (placemarks.count > 0) {
            CLPlacemark *placeMark = placemarks[0];
            currentCity = placeMark.locality;
            if (!currentCity) {
                currentCity = @"无法定位当前城市";
            }
            NSLog(@"%@",currentCity); //这就是当前的城市
            NSLog(@"%@",placeMark.name);//具体地址:  xx市xx区xx街道   
        }
        else if (error == nil && placemarks.count == 0) {
            NSLog(@"No location and error return");
        }
        else if (error) {
            NSLog(@"location error: %@ ",error);
        }
        
    }];        
}
定位服务状态改变
// 定位服务状态改变
 -(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status{
     switch (status) {
         case kCLAuthorizationStatusNotDetermined:{
             if ([self.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {
                 [self.locationManager requestAlwaysAuthorization];
             }
             NSLog(@"用户还未决定授权");
             break;
         }
         case kCLAuthorizationStatusRestricted:{
             NSLog(@"访问受限");
             break;
         }
         case kCLAuthorizationStatusDenied:{
             // 类方法,判断是否开启定位服务
             if ([CLLocationManager locationServicesEnabled]) {
                 NSLog(@"定位服务开启,被拒绝");
             } else {
                 NSLog(@"定位服务关闭,不可用");
             }
             break;
         }
         case kCLAuthorizationStatusAuthorizedAlways:{
             NSLog(@"获得前后台授权");
             break;
         }
         case kCLAuthorizationStatusAuthorizedWhenInUse:{
             NSLog(@"获得前台授权");
             break;
         }
         default:
             break;
     }
 }

二、有了城市,我们就可以获取天气了

天气的api也有很多,我这里用的是聚合数据,他里面天气信息数据是免费的,基本天气的数据都有,还有具体api是怎么用的,都有详细介绍(我不是打广告的)。
请求示例(两种都可以):
https://op.juhe.cn/onebox/weather/query?cityname=%E6%B8%A9%E5%B7%9E&key=您申请的KEY
http://op.juhe.cn/onebox/weather/query?cityname=%E6%B8%A9%E5%B7%9E&key=您申请的KEY
注意:
NSString *url = [NSString stringWithFormat:@"https://op.juhe.cn/onebox/weather/query?cityname=%@&key=您申请的KEY",currentCity];
            NSString *str = [url stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
            NSURL *url1 = [NSURL URLWithString:str];
            NSURLRequest *urlR = [NSURLRequest requestWithURL:url1];
            NSURLSession *session = [NSURLSession sharedSession];
            
            NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:urlR completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
                NSString *rec = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
                NSDictionary *dic=[NSJSONSerialization JSONObjectWithData:[rec dataUsingEncoding:NSUTF8StringEncoding] options:NSJSONReadingAllowFragments error:nil];
               // NSLog(@"weather dic is %@", dic);
                NSDictionary *resultDic = [dic objectForKey:@"result"];
               // NSLog(@"resultArr is %@",resultDic);
                NSDictionary *dataDic = [resultDic objectForKey:@"data"];
               // NSLog(@"dataArr is %@",dataDic);
                NSArray *weatherArr = [dataDic objectForKey:@"weather"];
               // NSLog(@"weather is %@", weatherDic);
                //回到主线程刷新页面
                dispatch_async(dispatch_get_main_queue(), ^{
                    //NSLog(@"weatherDic is %@");
                     NSLog(@"weatherArr[0] is %@",weatherArr[0]);
                    NSLog(@"地点:%@",currentCity);
                    NSString *date = [weatherArr[0] objectForKey:@"date"]; //日期
                    NSLog(@"日期:%@",date);
                    NSDictionary *info = [weatherArr[0] objectForKey:@"info"];
                    NSArray *day = [info objectForKey:@"day"];
                    NSArray *night = [info objectForKey:@"night"];
                    NSLog(@"温度%@-%@",night[2],day[2]);
                    NSLog(@"天气:%@",day[1]);
                    NSLog(@"风向风力:%@\%@",day[3],day[4]);
                    NSString *week = [weatherArr[0] objectForKey:@"week"];
                    NSLog(@"星期: %@",week)                    
                });

这样你就能得到当前城市的天气信息了,当然手动获取其他城市的天气流程是一样的。

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