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：

//
//  ViewController.h
//  ASIHTTPRequestDemo
//
//  Created by Fox on 12-3-13.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    NSDictionary *cityWeather;

    IBOutlet UILabel *city;
    IBOutlet UILabel *weather;
}

- (IBAction)getWeather:(id)sender;
-(void)showWeather;
@property(nonatomic, retain) NSDictionary *cityWeather;

@end

ViewController.m如下：

//
//  ViewController.m
//  ASIHTTPRequestDemo
//
//  Created by Fox on 12-3-13.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#import "ViewController.h"
#import "JSON.h"
#import "ASIHTTPRequest.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize cityWeather;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)viewDidUnload
{
    [city release];
    city = nil;
    [weather release];
    weather = nil;
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

- (void)dealloc {
    [city release];
    [weather release];
    [super dealloc];
}

- (IBAction)getWeather:(id)sender {
    
    //use the opensourse ASIHTTPRequest to work with a network 
//get a city's weather
    NSURL *url = [NSURL URLWithString:@"http://m.weather.com.cn/data/101270101.html"];
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request setDelegate:self];
    [request startAsynchronous];
    
    
}

-(void)showWeather{
    [city setText:[NSString stringWithFormat:@"%@",[cityWeather objectForKey:@"city"]]];
    
    //    NSLog(@"cityName is %@",[cityWeather objectForKey:@"city"]);
    
    [weather setText:[NSString stringWithFormat:@"%@",[cityWeather objectForKey:@"weather2"]]];
    
}

//call this method when request finished
- (void)requestFinished:(ASIHTTPRequest *)request
{
    //    NSLog(@"the network is OK...");
    
    SBJSON *parser = [[SBJSON alloc] init];
    
    // Use when fetching text data
    NSString *responseString = [request responseString];
    //    NSLog(@"the responseString is %@",responseString);
    
// Use when fetching binary data
    NSData *responseData = [request responseData];
    
    //    NSLog(@"the responseData is %@",responseData);
    
    NSDictionary *dic = [[NSDictionary alloc] initWithDictionary:[parser objectWithString:responseString error:nil]];
    
    
    self.cityWeather= [dic objectForKey:@"weatherinfo"];
    
    
    [self showWeather];
    
    [parser release];
}


- (void)requestFailed:(ASIHTTPRequest *)request
{
    NSError *error = [request error];
    NSLog(@"the error is %@",error);
} 


@end