使用ASIHTTPRequest获得天气信息

使用ASIHTTPRequest+JSON一个简单的天气获取Demo，直接上代码：

工程结构截图如下：

加入ASIHTTPRequest的方法请查看上一篇文件，ViewController.h代码如下：

 1 //
 2 //  ViewController.h
 3 //  ASIHTTPRequestDemo
 4 //
 5 //  Created by Fox on 12-3-13.
 6 //  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
 7 //
 8 
 9 #import <UIKit/UIKit.h>
10 
11 @interface ViewController : UIViewController
12 {
13     NSDictionary *cityWeather;
14 
15     IBOutlet UILabel *city;
16     IBOutlet UILabel *weather;
17 }
18 
19 - (IBAction)getWeather:(id)sender;
20 -(void)showWeather;
21 @property(nonatomic, retain) NSDictionary *cityWeather;
22 
23 @end

ViewController.m如下：

  1 //
  2 //  ViewController.m
  3 //  ASIHTTPRequestDemo
  4 //
  5 //  Created by Fox on 12-3-13.
  6 //  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
  7 //
  8 
  9 #import "ViewController.h"
 10 #import "JSON.h"
 11 #import "ASIHTTPRequest.h"
 12 
 13 @interface ViewController ()
 14 
 15 @end
 16 
 17 @implementation ViewController
 18 
 19 @synthesize cityWeather;
 20 
 21 - (void)viewDidLoad
 22 {
 23     [super viewDidLoad];
 24     // Do any additional setup after loading the view, typically from a nib.
 25 }
 26 
 27 - (void)viewDidUnload
 28 {
 29     [city release];
 30     city = nil;
 31     [weather release];
 32     weather = nil;
 33     [super viewDidUnload];
 34     // Release any retained subviews of the main view.
 35 }
 36 
 37 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
 38 {
 39     return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
 40 }
 41 
 42 - (void)dealloc {
 43     [city release];
 44     [weather release];
 45     [super dealloc];
 46 }
 47 
 48 - (IBAction)getWeather:(id)sender {
 49     
 50     //use the opensourse ASIHTTPRequest to work with a network 
 51 //get a city's weather
 52     NSURL *url = [NSURL URLWithString:@"http://m.weather.com.cn/data/101270101.html"];
 53     ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
 54     [request setDelegate:self];
 55     [request startAsynchronous];
 56     
 57     
 58 }
 59 
 60 -(void)showWeather{
 61     [city setText:[NSString stringWithFormat:@"%@",[cityWeather objectForKey:@"city"]]];
 62     
 63     //    NSLog(@"cityName is %@",[cityWeather objectForKey:@"city"]);
 64     
 65     [weather setText:[NSString stringWithFormat:@"%@",[cityWeather objectForKey:@"weather2"]]];
 66     
 67 }
 68 
 69 //call this method when request finished
 70 - (void)requestFinished:(ASIHTTPRequest *)request
 71 {
 72     //    NSLog(@"the network is OK...");
 73     
 74     SBJSON *parser = [[SBJSON alloc] init];
 75     
 76     // Use when fetching text data
 77     NSString *responseString = [request responseString];
 78     //    NSLog(@"the responseString is %@",responseString);
 79     
 80 // Use when fetching binary data
 81     NSData *responseData = [request responseData];
 82     
 83     //    NSLog(@"the responseData is %@",responseData);
 84     
 85     NSDictionary *dic = [[NSDictionary alloc] initWithDictionary:[parser objectWithString:responseString error:nil]];
 86     
 87     
 88     self.cityWeather= [dic objectForKey:@"weatherinfo"];
 89     
 90     
 91     [self showWeather];
 92     
 93     [parser release];
 94 }
 95 
 96 
 97 - (void)requestFailed:(ASIHTTPRequest *)request
 98 {
 99     NSError *error = [request error];
100     NSLog(@"the error is %@",error);
101 } 
102 
103 
104 @end