天气预报-06-Homerwork-网络

//
//  MyNetworkService.m
//  04-天气预报
//

#import "MyNetworkService.h"

#define BASEURL @"http://www.weather.com.cn"

@implementation MyNetworkService

+ (void)requestDataWithURL:(NSString *)urlString HTTPMethod:(NSString *)method params:(NSMutableDictionary *)params completionHandle:(void (^)(id result , NSURLResponse *response , NSError *error))completionHandle {
    
    
    //1.拼接URL
    NSString *requestURLString = [BASEURL stringByAppendingString:urlString];
    
    //2.构造URL
    NSURL *url = [NSURL URLWithString:requestURLString];
    
    
    //3.创建网络请求
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    
    request.HTTPMethod = method;
    
    //4.请求参数 key1=value1&key2=value2&key3=value3
    NSMutableString *paramStr = [NSMutableString string];
    
    for (NSInteger i = 0; i < params.count; i++) {
        NSArray *keys = [params allKeys];
        NSString *key = keys[i];
        NSString *value = params[key];
        
        [paramStr appendFormat:@"%@=%@", key, value];
        //如果是最后一个键值对，则不加&
        if (i < params.count - 1) {
            [paramStr appendFormat:@"&"];
        }
        
    }
    
    //如果为GET请求,则请求参数拼接在URL后面
    if ([method isEqualToString:@"GET"]) {
        
        //http://www.baidu.com
        //http://www.baidu.com?key1=value1
        NSString *seperate = url.query ? @"&" : @"?";
        NSString *newUrlString = [NSString stringWithFormat:@"%@%@%@", requestURLString, seperate,paramStr];
        
        //重新设置加入了请求参数的URL
        request.URL = [NSURL URLWithString:newUrlString];
        
        
        
    }
    //如果为POST请求,则请求参数放到请求体中
    else if ([method isEqualToString:@"POST"]) {
        
        request.HTTPBody = [paramStr dataUsingEncoding:NSUTF8StringEncoding];
    }
    
    //5.创建session
    NSURLSession *session = [NSURLSession sharedSession];
    
    NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        
        //判断是否请求成功，成功才解析JSON，并回到主线程更新UI
        if (!error) {
            //解析JSON
            NSJSONSerialization *json = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
            
            
            dispatch_async(dispatch_get_main_queue(), ^{
                completionHandle(json, response, error);
            });

        }
        
        
    }];
    
    [task resume];
  
}


@end

//
//  MyNetworkService.h
//  04-天气预报
//

#import <Foundation/Foundation.h>

@interface MyNetworkService : NSObject


+ (void)requestDataWithURL:(NSString *)urlString HTTPMethod:(NSString *)method params:(NSMutableDictionary *)params completionHandle:(void (^) (id result, NSURLResponse *response, NSError *error))completionHandle;


@end

//
//  ViewController.m
//  04-天气预报
//
#import "ViewController.h"
#import "MyNetworkService.h"


@interface ViewController ()

@end

@implementation ViewController
{
    //创建字典保存城市数据。创建数组保存城市名。
    NSDictionary *_data;
    NSArray *_cities;
    
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //通过plist文件获取城市数组。
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"cityCode" ofType:@"plist"];
    _data = [NSDictionary dictionaryWithContentsOfFile:filePath];
    _cities = [_data allKeys];
    
    
    //刚进入时请求第一个城市的网络数据
    [self pickerView:self.pickerView didSelectRow:0 inComponent:0];
    
    
    
}


- (void)refreshUI:(NSDictionary *)result {
    //大字典里key:weatherinfo
    //value：小字典。
    NSDictionary *weatherinfo = [result objectForKey:@"weatherinfo"];
    
    
    NSString *windLevel = weatherinfo[@"WS"];
    NSString *temp = weatherinfo[@"temp"];
    NSString *city = weatherinfo[@"city"];
    NSString *windDirection = weatherinfo[@"WD"];
    NSString *time = weatherinfo[@"time"];
    
    _tempLabel.text = [NSString stringWithFormat:@"温度:%@",temp];
    _windLevelLabel.text = [NSString stringWithFormat:@"风级:%@",windLevel];
    _cityLabel.text = [NSString stringWithFormat:@"城市:%@",city];
    _windDirLabel.text = [NSString stringWithFormat:@"风向:%@",windDirection];
    _publicTimeLabel.text = [NSString stringWithFormat:@"发布时间:%@",time];
    
}



#pragma mark - UIPickeView Delegate

//列数
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    
    return 1;
}

//根据城市个数获取行数
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    return _cities.count;
}

//每行的标题
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    NSString *cityName = _cities[row];
    return cityName;
}

//选中某行时调用的协议方法
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
    
    //网络加载方法
    [self loadWeatherWithCityIndex:row];
    
}



- (void)loadWeatherWithCityIndex:(NSInteger)index {
    
    //获取被选中的城市名称
    NSString *cityName = _cities[index];
    
    //获取城市id
    NSString *cityID = _data[cityName];
    
    
    //根据城市ID拼接URL
    NSString *urlString = [NSString stringWithFormat:@"/data/sk/%@.html", cityID];
    
    
    [MyNetworkService requestDataWithURL:urlString HTTPMethod:@"GET" params:nil completionHandle:^(id result, NSURLResponse *response, NSError *error) {
        
        NSLog(@"result:%@", result);
        
        [self refreshUI:result];
        
    }];
    
    
}




@end