鉴于柴静版《天穹之下》的火爆,也许更多的人会关心环境,空气质量等环保因素,参考某学院的Swift版本的PM2.5的获得,本人自己写个Objective-C版本的。
从服务器获得当前的空气质量数据,气象中心开放接口, 亚洲空气质量实时监控, 参照人家的教程使用亚洲空气质量监控。
本地解析数据,获得PM2.5数值,进行显示。
NSNumber *str;
-(void) loadData{
self.msgText.text = @"loading....";
NSURL *url = [NSURL URLWithString:@"http://aqicn.org/publishingdata/json"];
NSString *post=@"postData";
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"POST"];
[request setHTTPBody:postData];
[request setTimeoutInterval:10.0];
//GCD实现异步接口通讯与UI更新的同步
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSOperationQueue *queue = [[NSOperationQueue alloc]init];
[NSURLConnection sendAsynchronousRequest:request
queue:queue
completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){
if (error) {
NSLog(@"Httperror:%@%d", error.localizedDescription,error.code);
}else{
NSInteger responseCode = [(NSHTTPURLResponse *)response statusCode];
NSString *responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"HttpResponseCode:%d", responseCode);
NSLog(@"HttpResponseBody %@",responseString);
NSData *resData = [[NSData alloc] initWithData:[responseString dataUsingEncoding:NSUTF8StringEncoding]];
NSDictionary *resultDic = [NSJSONSerialization JSONObjectWithData:resData options:NSJSONReadingMutableLeaves error:nil];
NSLog(@"resultDic=%@", resultDic);
arr = [[resultDic valueForKey:@"pollutants"] valueForKey:@"value"];
str = [[arr objectAtIndex:0] objectAtIndex:0];
NSLog(@"PM2.5=%@", [[arr objectAtIndex:0] objectAtIndex:0]);
}
}];
dispatch_async(dispatch_get_main_queue(),^{
self.msgText.text = str.stringValue;
});
});
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self loadData];
// start reloadData
}
- (IBAction)reloadData:(id)sender {
NSLog(@"Button Clicked");
[self loadData];
NSLog(@"Button Clicked");
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
详情请参考以下链接:
源码地址