天气预报-06-Homerwork-网络

 1 //
 2 //  MyNetworkService.m
 3 //  04-天气预报
 4 //
 5
 6 #import "MyNetworkService.h"
 7
 8 #define BASEURL @"http://www.weather.com.cn"
 9
10 @implementation MyNetworkService
11
12 + (void)requestDataWithURL:(NSString *)urlString HTTPMethod:(NSString *)method params:(NSMutableDictionary *)params completionHandle:(void (^)(id result , NSURLResponse *response , NSError *error))completionHandle {
13
14
15     //1.拼接URL
16     NSString *requestURLString = [BASEURL stringByAppendingString:urlString];
17
18     //2.构造URL
19     NSURL *url = [NSURL URLWithString:requestURLString];
20
21
22     //3.创建网络请求
23     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
24
25     request.HTTPMethod = method;
26
27     //4.请求参数 key1=value1&key2=value2&key3=value3
28     NSMutableString *paramStr = [NSMutableString string];
29
30     for (NSInteger i = 0; i < params.count; i++) {
31         NSArray *keys = [params allKeys];
32         NSString *key = keys[i];
33         NSString *value = params[key];
34
35         [paramStr appendFormat:@"%@=%@", key, value];
36         //如果是最后一个键值对，则不加&
37         if (i < params.count - 1) {
38             [paramStr appendFormat:@"&"];
39         }
40
41     }
42
43     //如果为GET请求,则请求参数拼接在URL后面
44     if ([method isEqualToString:@"GET"]) {
45
46         //http://www.baidu.com
47         //http://www.baidu.com?key1=value1
48         NSString *seperate = url.query ? @"&" : @"?";
49         NSString *newUrlString = [NSString stringWithFormat:@"%@%@%@", requestURLString, seperate,paramStr];
50
51         //重新设置加入了请求参数的URL
52         request.URL = [NSURL URLWithString:newUrlString];
53
54
55
56     }
57     //如果为POST请求,则请求参数放到请求体中
58     else if ([method isEqualToString:@"POST"]) {
59
60         request.HTTPBody = [paramStr dataUsingEncoding:NSUTF8StringEncoding];
61     }
62
63     //5.创建session
64     NSURLSession *session = [NSURLSession sharedSession];
65
66     NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
67
68         //判断是否请求成功，成功才解析JSON，并回到主线程更新UI
69         if (!error) {
70             //解析JSON
71             NSJSONSerialization *json = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
72
73
74             dispatch_async(dispatch_get_main_queue(), ^{
75                 completionHandle(json, response, error);
76             });
77
78         }
79
80
81     }];
82
83     [task resume];
84
85 }
86
87
88 @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

  1 //
  2 //  ViewController.m
  3 //  04-天气预报
  4 //
  5 #import "ViewController.h"
  6 #import "MyNetworkService.h"
  7
  8
  9 @interface ViewController ()
 10
 11 @end
 12
 13 @implementation ViewController
 14 {
 15     //创建字典保存城市数据。创建数组保存城市名。
 16     NSDictionary *_data;
 17     NSArray *_cities;
 18
 19 }
 20
 21 - (void)viewDidLoad {
 22     [super viewDidLoad];
 23
 24     //通过plist文件获取城市数组。
 25     NSString *filePath = [[NSBundle mainBundle] pathForResource:@"cityCode" ofType:@"plist"];
 26     _data = [NSDictionary dictionaryWithContentsOfFile:filePath];
 27     _cities = [_data allKeys];
 28
 29
 30     //刚进入时请求第一个城市的网络数据
 31     [self pickerView:self.pickerView didSelectRow:0 inComponent:0];
 32
 33
 34
 35 }
 36
 37
 38 - (void)refreshUI:(NSDictionary *)result {
 39     //大字典里key:weatherinfo
 40     //value：小字典。
 41     NSDictionary *weatherinfo = [result objectForKey:@"weatherinfo"];
 42
 43
 44     NSString *windLevel = weatherinfo[@"WS"];
 45     NSString *temp = weatherinfo[@"temp"];
 46     NSString *city = weatherinfo[@"city"];
 47     NSString *windDirection = weatherinfo[@"WD"];
 48     NSString *time = weatherinfo[@"time"];
 49
 50     _tempLabel.text = [NSString stringWithFormat:@"温度:%@",temp];
 51     _windLevelLabel.text = [NSString stringWithFormat:@"风级:%@",windLevel];
 52     _cityLabel.text = [NSString stringWithFormat:@"城市:%@",city];
 53     _windDirLabel.text = [NSString stringWithFormat:@"风向:%@",windDirection];
 54     _publicTimeLabel.text = [NSString stringWithFormat:@"发布时间:%@",time];
 55
 56 }
 57
 58
 59
 60 #pragma mark - UIPickeView Delegate
 61
 62 //列数
 63 - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
 64
 65     return 1;
 66 }
 67
 68 //根据城市个数获取行数
 69 - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
 70     return _cities.count;
 71 }
 72
 73 //每行的标题
 74 - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
 75     NSString *cityName = _cities[row];
 76     return cityName;
 77 }
 78
 79 //选中某行时调用的协议方法
 80 - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
 81
 82     //网络加载方法
 83     [self loadWeatherWithCityIndex:row];
 84
 85 }
 86
 87
 88
 89 - (void)loadWeatherWithCityIndex:(NSInteger)index {
 90
 91     //获取被选中的城市名称
 92     NSString *cityName = _cities[index];
 93
 94     //获取城市id
 95     NSString *cityID = _data[cityName];
 96
 97
 98     //根据城市ID拼接URL
 99     NSString *urlString = [NSString stringWithFormat:@"/data/sk/%@.html", cityID];
100
101
102     [MyNetworkService requestDataWithURL:urlString HTTPMethod:@"GET" params:nil completionHandle:^(id result, NSURLResponse *response, NSError *error) {
103
104         NSLog(@"result:%@", result);
105
106         [self refreshUI:result];
107
108     }];
109
110
111 }
112
113
114
115
116 @end